Shield - Grounding 1

IPP Renewal Project Synchronous Condensers EPC Contract Issue
196137.73.0213 Technical Specification 21OCT2021
Each VFD shall be functionally tested with its motor to ensure that if the drive is operated according to
the manufacturer's instructions, the VFD and its motor will run properly. Each VFD and motor shall be
run for a minimum of 24 hours at the factory prior to shipment. The Owner shall have the option of
witnessing factory test of all motors. Scheduling of testing shall be coordinated with the Owner.
The section does not apply to the startup frequency converter (SFC).
01624.5 Power and Control Wiring

Insulated cable, conductors, and conductor accessories for power, communications, grounding,
instrumentation, and other electrical applications shall be furnished and installed by the Contractor in
accordance with the standards and requirements detailed in these Specifications and individual work
package requirements.
01624.5.1 Design Conditions

Cable feeders at medium voltage to power distribution equipment shall be sized so that through fault
current from a short-circuit fault at the terminals of the load shall not result in damage to the cable prior
to normal operation of fault interrupting devices.
Cable for medium voltage service shall be fully shielded, thereby accomplishing the following results:
Confinement of the dielectric field within the cable.
Obtaining a symmetrical radial distribution of voltage stress within the dielectric.
Compliance with ICEA recommendations for shielding.
Reducing the hazard of shock to personnel.
Allowing circuits to be dc high potential tested after installation.
Instrument cable shall be fully shielded to minimize electrical noise attenuation as follows:
Aluminum-polyester tape with 100 percent coverage and copper drain wire shall be used for
shielding. Cabling going to and from switchyard shall have a corrugated copper shield.
Low level analog signal cables shall be made up of twisted and shielded pairs.
Except where specific reasons dictate otherwise, cable shields shall be electrically continuous. When
two lengths of shielded cable are connected together at a terminal block, a point on the terminal block
shall be used for connecting the shields.
Digital signal cables shall be twisted pair and/or shielded if required by the Control System or
instrumentation Contractor.
For multipair cables utilizing individual pair shields, the shields shall be electrically isolated from each
other.
Unless dictated otherwise by the control equipment Contractor (i.e., Control System), instrument cable
shields shall be grounded on one end as follows:
The shield on instrument circuits shall be grounded at the power supply end.
The shields on grounded, as well as ungrounded thermocouple circuits, shall be grounded at

the Control System.
Source: 01624, 2017, v1.1 Electrical Design Criteria Page 119 of 769
Multipair cables used with thermocouples shall have individually isolated shields so that each
shield shall be maintained at the particular thermocouple ground potential.
Each RTD (resistance temperature detector) system, consisting of one power supply and one
or more RTDs, shall be grounded at only one point.
RTDs embedded in windings of transformers and rotating machines shall be grounded at the
frame of the respective equipment. The shields shall also be grounded at the equipment,
unless dictated otherwise by the control equipment Contractor.
The low or negative potential side of a signal pair shall be grounded at the same point where
the shield is grounded. Where a common power supply is used, the low side of each signal
pair and its shield shall be grounded at the power supply.
01624.5.2 Conductors
All current carrying conductors, except for thermocouple wiring and overhead conductor, shall be
copper.
The maximum ampacities for any cable shall depend upon the worst case in which the cable shall be
routed (tray, conduit, duct, or direct buried). In addition to ampacity, special requirements such as
voltage drop and available fault current shall be taken into consideration in sizing of cable.
The allowable ampacity of power cables shall be in accordance with ICEA or NEC requirements.
The cable size that meets these requirements shall be increased to the next size for the final sizing of
the cable. End devices such as motors, breakers, panels, etc. shall be designed to accommodate the
terminations of the selected cable size.
01624.5.3 Cable Constructions

Cable construction shall be as follows. IEC standards may be acceptable provided they meet or
exceed the requirements outlined in IEEE and NEC standards. Should IEC standards not meet the
NEC requirements, then the NEC standard shall govern.
Table 01624-6 Cable Construction

Voltage Level/Application Minimum Cable Construction
Medium Voltage Power 1/c or 3/c, FR-XLPE insulation, copper tape-shielded,
CSPE or thermoset CPE jacket, 133% insulation
Low Voltage Power 1/c or 3/c, FR-XLPE insulation, CSPE or thermoset CPE
jacket
Low Voltage Control XLPE or EPR insulation, CSPE or thermoset CPE jacket
Instrument - 600 V Individual pair or triad shields with overall shield, FR-PVC
or PVC/Nylon insulation, CSPE or thermoset CPE jacket
Instrument Thermocouple Individual pair shields with overall shield, TYPE II XLPE,
Extension Wire - 600 V ICEA S-82-552, PART 3; NOT LESS THAN 25 MIL
AVERAGE THICKNESS (22.5 MIL MINIMUM
THICKNESS).
, thermoset CPE jacket
Grounding Bare conductor or 1/c THHN/THWN, green insulation
Table 01624-6 Cable Construction

Voltage Level/Application Minimum Cable Construction
Lighting - Interior at 120 V 600V, 1/c THHN/THWN insulation
Lighting - Exterior and interior 600V, 1/c XHHW-2 insulation
greater than 120 V
Lighting - Interior or above 600V, Metal-clad cable, multi-conductor, XHHW-2
ground exterior 120 V/277 V insulation, aluminum continuously welded armor sheath,
with CSPE or thermoset CPE jacket
Lighting - Behind concealed 600V, Metal-clad cable, multi-conductor, XHHW-2
walls and above ceiling plenums insulation, interlocked galvanized steel or aluminum
continuously welded armor sheath, without jacket
Note: Special application cables and high voltage cables are not listed.
Table 01624-7 Cable Configurations*

Cable Type Standard Sizes to Be Used
Medium Voltage Power 2/0, 4/0 AWG
250, 350, 500, 750, 1000 kcmil
Low Voltage Power 3/c – 12, 10, 8, 6, 4, 2 AWG
1/c - 2/0, 4/0 AWG; 350, 500, 750, 1000 kcmil
Low Voltage Control 8, 10, 12, 14 AWG
Instrumentation 16 AWG for single pair/triad
16 AWG for multiple pairs/triads
Thermocouple Extension 16 AWG for single pair
16 AWG for multiple pairs
*Special applications may require deviations from the above sizes.
01624.5.3.1 Flame Retardance. To minimize the damage that can be caused by a fire, insulated
conductors installed in cable tray shall have non-propagating and self-extinguishing characteristics.
These cables shall meet the flame test requirements of IEEE 1202.
01624.5.3.2 Medium and High Voltage Power Cable. High voltage power cable shall be specified
and furnished by the Contractor on an application basis and approved by the Owner. Medium voltage
power cable shall meet the requirements as specified herein and shall meet AEIC CS8 and ICEA S-97-
682 requirements and shall be listed for cable tray use.
01624.5.3.3 Low Voltage Power Cable. Single conductor power cable shall be UL listed for cable
tray use, ICEA S-95-658, and shall meet the flame test requirements of UL VW-1 (all sizes) and IEEE
1202 or CSA FT-4 (1/0 AWG and larger). Three conductor power cable shall have ground conductors
sized in accordance with UL 1277, and shall be UL listed Type TC. Cable shall meet ICEA S-95-658
requirements. The specific cable selected shall be determined by the application.
01624.5.3.4 Low Voltage Control Cable. Control cable shall be 14 AWG and have ICEA S-73-532
Method 1 Table E-2 conductor identification, and shall be UL listed Type TC. Cable shall meet ICEA S-
73-532 and UL 1277, and shall meet the flame test requirements of IEEE 1202 or CSA FT-4 0.6/1 (1.2)
kV
01624.5.3.5 Instrument Cable. 600 Volt instrument cable shall be 16 AWG single pair, single triad,
multi-pair shielded or multi-triad shielded instrument cable with individual shield (screen) over each pair
or triad and an overall shield. Instrument cable shall utilize ICEA S-73-532 Appendix E, Method 9A–
colored cores with printed core numbers. Cables shall meet ICEA S-73-532 requirements, shall be UL
listed Type PLTC/ITC and shall be flame retardant to IEEE 1202 or CSA FT-4.
The type of cable used shall be determined by individual circuit requirements, individual equipment
manufacturer's recommendations, and compliant with requirements of these specifications.
01624.5.3.6 Thermocouple Extension Cable. Thermocouple extension cable shall be used for
extension leads from thermocouples to junction boxes and to instruments for measurements of
temperature. Thermocouple cable shall be single pair or multi-pair shielded thermocouple extension
solid conductor cable with a shield over each pair, and an overall shield. Cables shall conform to ICEA
S-73-532, shall be UL listed Type PLTC, and shall be flame retardant to IEEE 1202 or CSA FT-4.
01624.5.3.7 High Temperature Cable. High temperature cable shall be used for wiring to devices
located in areas with ambient temperatures above 75 C (167 F). Cables may be routed in conduit.
Cable lengths may be minimized by terminating the cable at terminal boxes or conduit outlet fittings
located outside the high temperature area and continuing the circuit with control or thermocouple
extension cable. The following cable construction shall be utilized:
Single-conductor control cable; NEC Type SF-2 12 AWG; stranded copper conductor; silicone rubber
insulation; braided glass jacket.
Single pair shielded thermocouple extension cable; solid alloy conductor with the same material as the
thermocouples; 16 AWG; FEP teflon insulation; FEP teflon jacket overall.
01624.5.3.8 Lighting and Fixture Cable. Lighting and fixture cable with 600 volt insulation shall be
used as follows:
NEC Type XHHW single conductor with copper conductor for 120 volt circuits in outdoor or
unheated areas. All circuit runs shall be totally in conduit.
NEC Type THHN or THWN single conductor with copper conductor for 120 volt circuits in
heated areas. All circuit runs shall be totally in conduit.
If approved by the Owner, multi-conductor cable is not required for the following applications if
cable is ran in RGS conduit, or direct buried schedule 40 PVC conduit:
Interior or above ground exterior 120 V/277 V
If concealed behind walls or above ceiling plenums
Circuit runs for roadway or outdoor area pole mounted lighting shall be stranded copper
conductors, NEC Type XHHW conductor insulation, enclosed in Schedule 40 PVC conduit or
polyethylene duct.
Fixture wire shall be NEC Type SF-2 with copper conductor, silicone rubber insulation, braided
glass jacket.
Minimum conductor size shall be 12 AWG.
01624.5.3.9 Grounding Cable. Grounding cable shall be Class B or C, NEC Type THWN or THHN
insulated and uninsulated soft drawn copper conductors, sized as required.
01624.5.3.10 Switchboard and Panelboard Cable. Switchboard and panelboard cable shall be
insulated for 600 volts with FR-XLPE or FR-EPR moisture resistant insulation, meeting requirements of
UL 1581 (VW-1) flame test.
01624.5.3.11 Special Cable. This type of cable shall include cable supplied with equipment,
prefabricated cable, coaxial cable, communication cable, etc. This cable will normally be supplied by a
particular manufacturer.
Special cable shall be routed in accordance with manufacturer's recommendations.
01624.5.3.12 Miscellaneous Cable. If other types and construction of cable are required as design
and construction of the unit progress, they shall be designated and routed as required.
01624.5.3.13 Internal Cabinet Wiring. Internal cabinet wiring, if required, shall be copper with Type
SIS cross-linked polyethylene insulation rated 600 volts and shall be Rockbestos Firewall Type SIS, or
acceptable equal as approved by the Owner.
01624.5.3.14 Free Stripping of Insulation. The insulation shall be free-stripping from the conductor.
Cable which requires wire brushing of the conductor or dipping of the conductor into molten solder, to
facilitate terminating, is not acceptable.
01624.5.3.15 Alternative Materials. Some alternate insulation and jacketing materials to those
indicated on in this specification will be considered. The following paragraphs indicate the requirements
for alternates.
01624.5.3.15.1 Alternative Insulation. Flame retardant ethylene-propylene rubber which is in

accordance with the requirements ICEA S-95-658Type X-1 or X-2 insulation and also meets UL VW-1
flame test will be evaluated as an alternate to the specified flame retardant cross-linked polyethylene.
01624.5.3.15.2 Alternative Jacket. Neoprene and polyvinyl chloride will not be evaluated as
alternates to the specified jacket materials. Chlorinated polyethylene (CPE) will be evaluated as an
alternate when chlorosulfonated polyethylene is specified, provided the CPE meets the following
requirements when tested in accordance with ICEA S-95-658:
Tensile strength, minimum, psi: 1,400.
Tensile stress at 100 percent elongation, minimum psi: 1,000.
Elongation at rupture. Minimum percent: 150.
Aging requirements:
After air oven at 121° C ± 1° C for 168 hours:

Tensile strength, minimum, percentage of unaged values: 85.
Elongation at rupture, minimum, percentage of unaged values: 50.
After oil immersion test at 100° C ± 1° C for 18 hours:

Tensile strength and elongation at rupture minimum. Percentage of unaged
value: 60.
Heat distortion at 121° C ± 1° C, percentage maximum: 20.
Heat shock at 121° C ± 1° C: No cracks.
Cold bend at minus 35° C ± 1° C: No cracks.
01624.5.3.16 Cable Markings. All cable procured for installation shall include the following
information printed on the cable outer sheathing:
Cable Manufacturer.
Manufacturer’s cable number.
Cable type, insulation, sheathing and conductor information (shielded, twisted), and conductor
quantity. Sheathing shall also include a periodic length indication.
Individual conductors shall be identified with a unique conductor number. Each control cable
conductor shall have a unique color or color combination.
Internal SIS wiring “Speed Pull” conductors shall have a unique conductor number and/or color.
Cabling external and internal shall be labeled by the Contractor as specified in Article
01624.5.5.4.
01624.5.3.17 Cable Reels. Cable purchased by Contractor shall be received, unloaded, and stored in
the location designated by the Owner. Cable reels shall be stored and handled in a manner which will
prevent physical damage to the cable. Cable reels shall be handled and lifted by the cable reel only.
Lifting devices shall not contact the cable. Cable reels shall be stored on a hard surface to prevent
contact between the cable and the earth or the cable and the supporting surface. Any cable reels
which sink or shift such that the cable contacts the earth, or any supporting surface shall be
immediately lifted and the supporting structure reworked to prevent this contact. Protective coverings
furnished with the cable shall be maintained to prevent direct exposure of the cable to sunlight. Cable
shall be stored so the flanges on adjacent cable reels do not contact the cable. Impact damage
between reels shall be prevented by aligning reels flange to flange or by using guards across flanges.
During storage, the ends of all cable rated 5 kV and above shall be protected with end caps.
01624.5.4 Testing Requirements

Production tests for all cables shall be performed in accordance with the appropriate codes and
standards. In addition, qualification tests reports for all medium voltage ICEA/AEIC cables shall be
provided by the manufacturer for each cable type furnished.
Jackets shall meet the following requirements when tested in accordance with ICEA S-95-658 (NEMA
WC 70), ICEA T-27-581 (NEMA WC 53), and IEEE 383 (ANSI N41.10):
Specific surface resistivity, minimum, megohms: 200,000.
Accelerated water absorption 75° C water, 7 days immersion, maximum, milligrams per square
inch: 20.
Halogen content of the jackets shall not exceed 18 percent by weight.
Jackets, as received, shall be smooth, free from surface damage, irregularities and free-
stripping. Severe damage or recurring irregularities may be cause for rejection of cable by
Construction Manager.
Preoperational tests shall be performed on all insulated conductors after installation. All circuits,
including lighting circuits, shall be tested with the circuit complete except for connections to equipment.
All splices, stress cones on shielded cable, and terminal connector attachments shall be complete prior
to testing.
In addition to the tests performed after cable placement is complete, continuity tests and insulation tests
shall be performed on all supervisory and communication cable before and after each splice is made.
Any 5 kV or greater circuit failing to test satisfactorily shall be replaced and then retested. Any circuit
lower than 5 kV shall be replaced, or repaired if allowed by the Owner, and then retested. All insulated
conductors with insulation rated 5000 volts and above shall be given a field dc insulation test after
installation as specified in Appendix E of ICEA Standard S-97-682 and a partial discharge test with tan
delta measurements.
Cables with 5kV rated insulation or less shall be insulation resistance tested (megger) prior to
connecting cables to equipment. Insulation resistance measurements shall be made between each
conductor and ground and between each conductor and all other conductors of the same circuit.
Minimum acceptable resistance values shall be 500 megohms.
Cable used for instrumentation shall be checked for continuity prior to energization.
01624.5.5 Cable Installation

Installation shall be defined to include placement, splicing, terminating conductors, coiling and taping of
spare conductors, identification, testing, and verification of each circuit, cable, and conductor; and
termination of shielding and grounds. As specified in 01624.5.5.2, cable splicing is not allowed without
Owner’s approval.
Terminating a conductor shall include installing cable termination kits for shielded cable, attaching the
conductor at its designated location, and insulating the entire connection where specified or required by
the application. Contractor shall provide and install cable identification tags or labels printed with the
unique cable identification number. Unique cable identification numbers shall be based on and
determined by the Owner specified numbering. Contractor shall request identification numbers from the
Owner as necessary for the design.
Conductor installation shall be in accordance with the cable manufacturer's recommendations and the
articles that follow.
01624.5.5.1 Cable Placement. Cable shall not be handled when the cable temperature is below the
minimum temperature recommended by the manufacturer. If cable heating is required prior to
placement, the cable shall be stored in a heated building in accordance with the manufacturer's
recommendations for at least 24 hours. Cable shall be placed the same day it is removed from heated
storage.
Immediately prior to the placement of each cable or cable group in its assigned raceway, the
dimensions of the cable and raceway shall be checked to determine that the raceway is of adequate
size according to the requirements of NFPA 70 (NEC) for new raceway. If the raceway size is
inadequate, a new raceway of sufficient capacity shall be provided.
Immediately prior to the placement of each cable or cable group, the raceway route to be followed shall
be inspected and ascertained to be complete in installation and free of all materials detrimental to the
cable or its placement. All cable assigned to a particular duct or conduit shall be grouped and pulled in
simultaneously using cable grips and acceptable lubricants.
All cable shall be carefully checked both as to size and length before being pulled into conduits or
ducts. Cable pulled into the wrong conduit or duct or cut too short to rack, train, and splice as specified
herein shall be removed and replaced by and at the expense of the Contractor. Cable removed from
one conduit or duct shall not be pulled into another conduit or duct.
Control and Power cabling shall be routed in separate conduits. High and medium voltage power cable
shall be routed in dedicated raceways. Cables carrying electronic signals such as 24VDC, 4-20mA DC,
0-10 VDC shall not be mixed with other cables types without maintaining separation.
Cable segregation requirements shall be maintained, if required by OEM..
All communication cables shall be routed in conduit or in a separate wireway dedicated to

communications cabling only. Not more than one communication cable shall be installed in a single
conduit.
Fire protection cable shall be routed in dedicated raceway and shall not be shared with other cables.
01624.5.5.1.1 Cable in Trays. All cable shall be carefully laid in or pulled through the tray system so
that neither the cable nor the trays are damaged. Cable may be laid along the side of the tray system
during placement provided it is protected from dirt, water, oil, or other detrimental materials and from
mechanical injury. Cable shall be cut sufficiently long to conform to the contour of the trays, with
particular attention paid to vertical inside bends. All excessive slack shall be removed from the cable so
that it lies parallel to the sides of the trays. Multiple single conductor cable which constitutes a single
power circuit shall be grouped together to minimize magnetic influence on other cable in the area. The
cable shall be tied to the trays with nylon ties at 10-foot intervals to hold it in place. Cable clamps
designed for holding the cable inside the trays shall be installed at all vertical bends.
01624.5.5.1.2 Cable Pulling. Fishing and pulling shall be done with flexible round metal tape, CO2
propelled polyethylene cord, nylon rope, or manila rope.
Unless specified otherwise, or acceptable to the Owner, cable shall not be pulled in a single pull
through two sections of raceway connected by a manhole or pull box. Cable shall be pulled out at each
manhole and pull box to the length required for termination. Prior to re-pulling of the pulled out cable,
the cable shall be thoroughly inspected, cleaned, and re-lubricated. Damaged cable shall be removed
and replaced by and at the expense of Contractor.
Cable may be pulled in a single pull through two (2) sections of raceway connected by a manhole or
pull box only if it can be determined by calculation to the satisfaction of the Owner that the pulling
tension will not exceed the maximum tension allowed by the cable manufacturer.
01624.5.5.1.3 Cable Grips. Factory installed pulling eyes shall be used for pulling cable where they
are available. Woven wire cable grips shall be used to pull all single conductor cable 2/0 AWG and
larger, where pulling eyes are not available, and all multi-conductor cable. Pulling loops shall be used
to pull single conductor cable smaller than 2/0 AWG. All sharp points and edges on the hardware
attaching the pulling rope to the cable shall be taped to prevent snagging or damaging the raceway.
When a cable grip or pulling eye is used for pulling, the area of the cable covered by the grip or seal
plus 6 inches shall be cut off and discarded when the pull is completed. When pulling loops are used,
the entire loop shall be cut off and discarded when the pull is completed.
As soon as the cable is pulled into place, the pulling eyes, cable grips, or pulling loops shall be removed
and any cable which was sealed shall be resealed.
01624.5.5.1.4 Swivels. A reliable nonfreezing type of swivel, or swivel connection, shall be inserted
between the pulling rope and the cable pulling eye, grip, or loop to prevent twisting under strain.
01624.5.5.1.5 Feeding Tubes. A 4-inch or larger flexible feeding tube, with a removable nozzle sized
to fit the ducts, shall be used in pulling all underground cable. The feeding tube shall be long enough to
extend from the duct entrance to the outside of the manhole and shall be so arranged that it will be
impossible for the cable to drag across the edge of the manhole ring or any other damaging surface.
The bending radius of the tube shall not be less than the minimum bending radius of the cable specified
in this section under the article titled Cable Bends.
01624.5.5.1.6 Pulling Lubricants. Only lubricants recommended by the cable manufacturer and
acceptable to the Owner shall be used. Lubricants shall be applied liberally and continuously during the
pull.
01624.5.5.1.7 Inspection. The outside of each cable reel shall be carefully inspected and protruding
nails, fastenings, or other objects which might damage the cable shall be removed. A thorough visual
inspection for flaws, breaks, or abrasions in the cable sheath shall be made as the cable leaves the
reel, and the pulling speed shall be slow enough to permit this inspection. Damage to the sheath or
finish of the cable shall be sufficient cause for rejecting the cable. Cable damaged in any way during
installation shall be replaced by and at the expense of Contractor.
01624.5.5.1.8 Pulling Tension. The pulling tension of any cable shall not exceed the maximum
tension recommended by the cable manufacturer. Pulling mechanisms of both the manual and power
types used by the Contractor shall have the rated capacity in tons clearly marked on the mechanism.
Whenever the capacity of the pulling mechanism exceeds the recommended pulling tension of the
cable as given by the cable manufacturer, a dynamometer shall be used to show the tension on the
cable and the indicator shall be constantly watched. If any excessive strain develops, the pulling
operation shall be stopped at once and the difficulty determined and corrected.
01624.5.5.1.9 Sidewall Pressure. To avoid insulation damage from excessive sidewall pressure at
bends, the pulling tension in pounds at a bend shall not exceed 300 times the radius of the bend in feet.
01624.5.5.1.10 Cable Bends. Tape shielded, flat tape armored, and wire armored cable shall not be
bent to a radius of less than 12 times the overall cable diameter. All other cables shall not be bent to a
radius of less than eight times the cable diameter.
01624.5.5.1.11 Supports. All cable supports and securing devices shall have bearing surfaces
located parallel to the surfaces of the cable sheath and shall be installed to provide adequate support
without deformation of the cable jackets or insulation.
Adequate cable end lengths shall be provided and properly placed in junction boxes and manholes to
avoid longitudinal strains and distorting pressures on the cable at conduit bushings and duct end bells.
Final inspection shall be made after all cable is in place and, where supports or raceway fittings deform
the cable jacket, additional supports shall be provided as directed by the Owner.
Additional cable protection such as a wrapping of light rubber belting, friction tape, or similar material
shall be provided where required.
Cable in vertical runs shall be supported by woven wire grips in accordance with the NEC requirements,
except that the distance between supports shall not be less than the following:
Vertical Cable Support Spacing

Conductor Size Copper Conductor
1/0 AWG and smaller 100 feet
2/0 AWG thru 500 Kcmil 50 feet
Larger than 500 Kcmil 30 feet
01624.5.5.1.12 Cable Racks. Where cable trays are not specified in manholes, cable racks shall be
furnished and installed according to the drawings and as required to provide the proper cable support.
Cable racks shall be installed on spacings of not greater than 36 inches and shall be bolt secured to
permanent wall surfaces with self-drilling anchors or continuous slot concrete inserts.
01624.5.5.1.13 Spare Conductors. All spare conductors of a multi-conductor cable shall be routed to
the bottom of the enclosure and left long enough to reach any terminal in the enclosure. Spare
conductors shall be neatly coiled and tagged with the circuit number of the cable.
01624.5.5.1.14 Lacing. Nylon ties shall be used to neatly lace together conductors entering
switchboards and similar locations after the conductors have emerged from their supporting raceway
and before they are attached to terminals.
01624.5.5.1.15 Cable Identification and Labeling. Contractor shall identify the ends of all circuits.
Contractor shall also identify all circuits in manholes, hand-holes, and pull boxes.
Each marker shall bear the number of the circuit in conformance with the Owner’s numbering standard.
At terminations, Contractor shall identify each conductor of power circuits, each multi-conductor cable,
and each conductor of circuits consisting of multiple single conductors where the conductors are not
otherwise identified. Markers shall be attached where the first individual conductor is routed away from
the assembly. Each phase of multi-phase power circuits shall be individually identified.
One end of each marker board shall remain free of the fastening tail, and the entire marker shall be so
attached that it is readily visible for circuit identification.
01624.5.5.2 Cable Splices. No splices shall be made in conductors for instrument circuits or control
circuits without specific acceptance by the Owner except where required at connections to accessory
devices equipped with factory installed pigtails or where high temperature wire is necessary locally to
connect to a particular device. Shields may be spliced where necessary to permit connection to the
station ground.
Power cable circuits may be spliced only by methods and at locations acceptable to the Owner.
Splicing of 5 kV and above power circuit cables is not permitted. Splices are permitted only at junction
boxes for 480 volt circuits or 120 volt circuits.
Splices shall not be made to utilize short lengths of cable nor shall they be made to provide correct
lengths on cable initially cut too short for a particular circuit.
Splices, joints, and connections in cable shall be made only in pull boxes, junction boxes, or manholes
unless otherwise indicated on the drawings and shall be made in accordance with the instructions of the
cable manufacturer.
Splices in cable shall be prepared and insulated in a manner similar to the cable terminations specified
below.
01624.5.5.3 Terminations. Cable shall be terminated in accordance with the following requirements:
Train cable in place and cut squarely to required length. Avoid sharp bends.
Remove necessary amount of cable jacket and insulation without damage to the conductor.
Install terminals or terminal connectors as required, ensuring a firm metal-to-metal contact.
Install high voltage cable termination kits for shielded cable rated 5 kV and above using the procedures
recommended by the manufacturer of the kit being used. Coordinate with switchgear for adequate
room, proper cable attachment, and mounting bracket with hardware. Coordinate with cable Contractor
for correct termination lug and application. Insulate each connection of cable to an insulated conductor
(whether cable, bus, or equipment bushing). The insulation shall cover all exposed surfaces of the
conductors; the insulation voltage level of the completed termination shall not be less than the
insulation voltage level of the connected conductors.
Conductors for current transformer circuits shall be terminated with pre-insulated ring type terminal
connectors.
Control conductors 8 AWG (10 mm2) and smaller for circuits that leave an enclosure, cabinet, or skid
shall be terminated in a manner consistent with the type of terminal block used. Conductors from
control or instrumentation field cables source must be terminated on an interposing terminal block. No
field wiring shall directly terminate on a Control System or PLC I/O module.
01624.5.5.3.1 Insulation of 600 Volt Cable Connections. Where connections of cable rated 600
volts or less require insulation, such as cable shields that are not terminated, all exposed conductor and
connector surfaces shall be covered with tape in accordance with the following:
One half-lapped layer of varnished cambric tape.
A minimum of three (3) half-lapped layers of rubber tape, elongated not more than 20 percent,
applied over the varnished cambric tape.
A minimum of three (3) half-lapped layers of vinyl tape applied over the rubber tape. The vinyl
tape shall extend a minimum of two (2) cable diameters over the cable jacket and a similar
distance over the insulation of the conductor to which the cable is connected.
01624.5.5.3.2 Additional Installation Precautions for Cable Rated Above 5000 Volts.
Installation shall be in accordance with NEC.
Use suitable lubricating compounds on the cables and wires to prevent damage to them during
pulling. The compounds shall not be injurious to the cable and wire jackets and shall not
harden or become adhesive.
Do not exceed manufacturer's written instructions pulling tensions, sidewall pressure, and
bending radius.
Install the materials as per written instruction by their manufacturer including precautions
pertaining to air temperature during installation.
Installation shall be accomplished by qualified personnel trained to accomplish high voltage

equipment installation. All instructions of the manufacturer shall be followed in detail.
01624.5.5.4 Wire and Cable Labeling and Markers. All electrical and communication cables and
wire shall be labeled with an identifying number information.
01624.5.5.4.1 Cable Identification Numbers for External Cables. Cables external to control or
electrical panels or cabinets shall be labeled with a marker that includes a unique identifying cable
number in conformance with the Owner’s numbering standard.
The unique number for cables external to cabinets and panels shall be formatted at the direction of the
Owner. Refer to Attachment K, Article 21.2.4 for Owner’s cable numbering standard.
Cable numbers shall not be duplicated or reused. The cable id number for a cable that has been
determined or removed shall be retired.
Markers for wire and cable circuits shall be of an opaque nylon material arranged to include a marker
board, non-releasing holding device, and cable fastening tail. The marker board shall not be less than
3/4 inch wide, 2-1/2 inches long, and 15 mils thick and shall be Panduit Corp. Part No. MP250 marker
plates or acceptable equal. One side shall be roughened to hold black nylon marking ink from a fine tip
pen similar to Thomas & Betts Company "TY-RAP" marking pen, Catalog No. WTl63M-l, or Panduit
Corp. Part No. PFX-O marking pen. Identification shall be permanent and waterproof. The holding
device shall be designed to allow the fastening tail to pass around the cable through the holding device
and prevent the removal of the tail without cutting it loose from the marker.
01624.5.5.4.2 Cable Identification Numbers for Internal Cables. All internal wiring terminations
shall be identified by printing on conductor identification sleeves.
A conductor identification sleeve shall be provided on each end of each internal conductor. Each
sleeve shall be marked with the opposite end termination destination information.
Sleeves for conductor identification shall not be less than 1/2 inch long and shall be a Brady sleeve as
manufactured by W.H. Brady Company or acceptable equal. Conductor identification shall be printed on
a sleeve printed from a label machine designed for conductor marking and acceptable to the Owner.
After inscription of the conductor identification, the marking sleeve shall be coated as required to
prevent smudging. Adhesive labels are not acceptable.
01624.5.5.4.3 Labeling. Contractor shall be responsible to install cable and circuit identifying labels.
The entity responsible for the design of the internal wiring for the control or electrical cabinets or panels
shall determine and provide internal identification numbers and termination information.
01624.5.5.5 Cable Records. Contractor shall complete a Circuit Installation Record form for each
circuit installed, and a Circuit Termination Record form for each circuit terminated. Forms used shall be
acceptable to the Owner.
The following data shall be recorded on each Circuit Installation Record form:
Circuit number.
Origin and destination of the circuit (from-to).
Circuit routing by raceway number of actual installed route.
Cable type, size, and quantity.
Cable reel identification number.
Date circuit installation was completed.
Foreman of pulling crew.
Maximum pulling tension if not pulled by hand.
01624.5.5.6 Cable Termination Verification. In addition to testing required in section 01624.5.4, after
termination are complete, all cables shall have identification or “ring-out” tests performed to confirm that
the conductor being tested originates and terminates at the locations designated in the Circuit List and
as indicated on the drawings. A record of this verification shall be included on the cable record required
in section 01624.5.5.5.
01624.5.6 Connectors
This section defines methods of connecting cable between electrical systems and equipment. In this
section, the term "connector" is applied to devices that join two or more conductors or are used to
terminate conductors at equipment terminals for the purpose of providing a continuous electrical path.
Connector material shall be compatible with the conductor material to avoid the occurrence of
electrolytic action between metals.
Power cables shall utilize NEMA two-hole pressure type crimp connectors except when terminating to
devices which are provided with clamp type connectors as a standard feature, such as molded case
circuit breakers.
Medium voltage shielded cables shall not be spliced and shall have stress relief system applied at the
termination of the cables. Stress relief system shall be of the preformed cone type, hot or cold shrink
stress relief type suitable for the cable to which they are to be applied.
All conductor accessories including connectors, terminations, insulating materials, support grips,
markers, and cable ties shall be furnished and installed by Contractor. Conductor accessories shall be
located in the compartments, enclosures, or junction boxes in such arrangement that a service man will
have direct access to the equipment without removal of barriers, cover plates, or wiring.
Terminal blocks shall not be mounted in compartments containing un-insulated conductors operating at
voltages above 1000 volts.
Contractor's installation instructions shall be obtained for cable accessories. These instructions shall
be in the possession of the craftsmen while installing the accessories and shall be available to the
Owner for reference.
Materials containing asbestos shall not be used.
Each terminal block, terminal, conductor, relay, breaker, fuse block, and other auxiliary devices shall be
permanently labeled to match the identification on the drawings. All terminals provided for termination
of external circuits shall be identified by inscribing permanent terminal designations on the terminal
block. All internal wiring terminations shall be labeled, marked or otherwise uniquely identified at each
end of the conductor using the Contractor’s standard method. Conductor identification shall be
permanent, unaffected by age, heat, or solvents and not easily dislodged.
Din rail mounted current limiting circuit breakers for control circuits utilized for supplementary protection
of control circuits and components shall be compliant with standard UL1077. Manufacturers used shall
be approved by the Owner with specific model numbers determined by the Contractor and approved by
the Owner. Supplementary protection of branch circuits shall utilize devices compliant with UL489.
Supplementary protection devices for specific model number shall be determined by Contractor and
approved by the Owner. Devices compliant, respectively, with standards UL1077 and UL489 shall not
be presumed to be cross-compliant.
Reference to NEC means codes and standards as defined by the USA National Electrical Code, NFPA
70.
Upon conflicts in the NEC and NESC the Contractor shall notify the Owner.
01624.5.6.1 Terminal Connectors for Conductors 8 AWG and Larger. Terminal connectors for
conductors 8 AWG and larger shall be pressure or bolted clamp type, Burndy Qiklug, Varilug, or Owner
approved equal; or compression type, Burndy Type YAV or YA (long barrel), Panduit Type LCA or LCC,
or Owner accepted equal. Acceptable connectors included with Owner-furnished equipment may be
used.
01624.5.6.2 Terminal Connectors for Conductors Smaller than 8 AWG. Terminal connectors for
conductors smaller than 8 AWG shall be solid barrel ring compression type connectors properly sized
for the conductor and the terminal except for terminations on I/O module terminal blocks where
compression terminals may be used. Interposing terminal blocks shall be required between all
connections to I/O modules and corresponding field cables. Terminal connectors at interposing
terminal blocks shall be ring type connectors. The connectors shall be constructed of fine grade high
conductivity copper in accordance with QQ-C-576 and shall be tin plated in accordance with MIL-T-
l0727. The interior surface of the connector wire barrel shall be serrated, and the exterior surface of the
connector wire barrel shall be provided with crimp guides. A crimping tool shall be used for making the
two crimps such that the insulation crimp does not pierce the insulation and the bare conductor slightly
extends the wire crimp.
The Contractor shall ensure crimping is done correctly in conformance with the crimp terminal
connector and cable suppliers instructions. High quality cable and crimp terminals shall be selected.
Cable ends shall be appropriately plated to aid in bonding and for corrosion protection. The crimping
tool shall be a low-force ratcheting tool with pressure-release appropriate to the crimp terminal and
cable type selected. Contractor shall verify all crimps are done correctly and securely fastened.
Pre-insulated terminal connectors shall include a metallic support sleeve bonded to the vinyl-insulating
sleeve and designed to grip the conductor insulation.
Ring type connectors shall be manufactured by AMP, 3M, Panduit, or acceptable equal.
01624.5.6.3 Terminal Blocks. States Slide-Link type ZWM Terminal blocks or Owner approved
equivalent shall be furnished for all wiring leaving an enclosure, for internal circuits crossing shipping
splits, and where equipment parts replacement and maintenance will be facilitated. Exception to this
requirement may be allowed during detailed design. Contractor shall communicate when this
requirement is not being met with respect to specific equipment.
Terminal blocks shall be adequately sized for external connections and shall be grouped in the
instrument and control compartment for easy accessibility, without interference from structural members
or instruments. Space shall be provided on each side of each terminal block to allow an orderly
arrangement of all leads to be terminated on the block. For terminal blocks interfacing with the external
field cabling, to the extent practical, the right side of the terminal block shall be used by the equipment
manufacturer for factory wiring and the left side of the terminal block shall be reserved for the external
field cabling terminations.
Terminal blocks shall not be mounted in compartments containing uninsulated conductors operating at
voltages above 1000 volts.
The arrangement of connections on terminal blocks should be arranged vertically and numbered from 1
at the top to the highest number at the bottom and shall be acceptable to the Owner.
Self-stripping terminal blocks are not acceptable. Angled terminal blocks and multiple deck terminal
blocks shall only be used where approved by the Owner. Multiple deck blocks shall not exceed three
decks/layers in construction.
Each terminal block shall be provided with a unique identifier. All terminal points shall be uniquely
identified on the terminal block and, where permitted by the safety codes and standards, shall be
without covers. Spare points shall be provided with blank strips that can be permanently marked in the
field.
Twenty percent (20%) spare (unused) terminals shall be furnished evenly distributed on the terminal
blocks.
Terminal blocks shall be manufactured from materials rated Inflammability Class V0 in accordance with
UL 94.
For low voltage control, instrumentation, and power circuits, States Sliding Link Terminal Blocks type
ZWM are the Owner’s standard and should be utilized at both control system central marshalling
cabinets. Interposing terminal blocks are required between field wiring and I/O module terminals.
Exceptions must be Owner approved.
Terminal blocks not used for internal, factory prewired electronic systems or for thermocouple extension
wire, shall be rated for 600 volts or greater unless approved by the Contractor.
No more than two conductors shall be terminated at one connection point.
For installations requiring "Increased Safety" terminal blocks, the terminal blocks shall have a
CENELEC Certification Code marked on the terminal block.
For installations requiring voltage interface of 50V and greater, the terminal block shall be designed so
that incidental contact with bare metal screws, straps, jumpers, or conductors is not possible (finger
safe design). If this is not practical, clear plexiglass or polycarbonate barriers shall be installed so that
incidental contact with energized materials is not possible.
Rails for modular terminal blocks not used as a grounding conductor shall be corrosion-resistant steel.
Rails used as a grounding conductor shall be copper. Modular terminal blocks shall be designed to be
removed from the mounting rails independent of adjacent terminal blocks.
When knife disconnect terminal blocks are provided, they shall have test ports on both sides of the knife
disconnect. The knife disconnect shall be permanently attached to the block.
Terminal blocks for field terminations shall accept solid or stranded copper conductors with any wire
preparation method, such as crimps, ferrules, tinning, or appropriate to the application and terminal
block type selected. Clamping shall ensure mechanical and electrical integrity without damage to the
conductors. Current carrying terminal parts shall be coated or plated to prevent corrosion.
The current carrying parts of thermocouple terminal block shall be of the same materials as the
thermocouple extension wire. Termination points for extending the shield wire of the thermocouple
extension cable shall be provided adjacent to the block or shall be integral to the block.
Terminal blocks shall meet the requirements in the following table.
Acceptable
Terminal Termination Acceptable
Block Type Applications Methods Construction Acceptable Manufacturers
Feed- Thermocouple Strap Screw Manufacturer's See Exhibit D3
Through Extension Wire Compression Standard
Sliding Link Control System Compression
(Arc resistant) and PLC I/O, Strap Screw Grouped Block
Stud Bolted
Feed- General Purpose Strap Screw, Grouped Block,

Through Control Bolted, Modular,
Rail
Shorting Current Strap Screw Grouped Block
Transformer Bolted
Test switches Current Strap Screw Grouped Block
Transformer
Potential
Transformer
Power 600 Volt Power Screw, Grouped Block
(8 AWG through Compression, Bolted
4/0 AWG [10 mm2 Stud
through 95 mm2])
Acceptable
Terminal Termination Acceptable
Block Type Applications Methods Construction Acceptable Manufacturers
Power 600 Volt Power Screw, Bolted, Modular,
(6 AWG [16 mm2] Strap Screw, Rail
and smaller) Compression,
Stud
Push in terminals for low voltage electrical interface signals may be applied during detailed design
stage after acceptance by the Owner.
States Sliding Link type ZWM terminal blocks or Owner approved equivalent shall be used for external
control and instrumentation signal circuits or for service greater than 45 volts and less than 300 volts
and 20 amps or less, including power cables, and shall be front-connected with white marker strip. For
circuits over 20 amps and less than 30 amps, a sliding link terminal block rated for 50 amps shall be
used. Power cable shall not be terminated on sliding link type terminal blocks, if the power cable is
used to supply power to more than one piece of equipment, or more than one Control System I/O card.
In such case power cable shall be terminated on Marathon 1500 or 1600 series or Allen-Bradley Cat #
1492-CD3 terminal blocks or equivalent. Terminal blocks for service of 45 volts and less shall be sliding
link type.
Screw or stud type terminal blocks shall be used for all controls applications, and power circuits to 20
amps and less than 480V shall be Allen-Bradley Cat # 1492-CD3 or approved equal unless specified
otherwise in Construction Drawings. Terminal blocks for power circuits up to 30 amps and up to 480V
shall be Marathon 1500 or 1600 Series or equivalent. Screw or stud type terminal blocks shall be used
for all PT circuits.
Shorting terminal blocks shall be used for all CT circuits with all shorting screws pre-installed prior to
termination of any CT circuits. Shorting screws shall only be removed after CT circuits are completely
terminated and verified as such. The shorting terminal blocks shall be the nearest to the current
transformers and easily accessible. Current transformers shall be grounded only at the shorting
terminal blocks. The grounding conductor shall be identified so that it may be disconnected in the field
as required.
Test switches shall be included for all CT and PT terminations and shall be manufactured by ABB FT-1
type or AVO (States) FMS type for semi-flush mount applications, for surface mount applications AVO
(States) type MTS test switches with high barriers shall be used, or Owner approved alternative.
Switch configurations shall be shown on all applicable construction drawings.
Compression type terminal blocks shall only be acceptable on control system I/O module terminals as
approved by the Owner and shall not be used elsewhere unless specifically identified as acceptable to
the Owner.
Fused terminal blocks shall be Allen-Bradley Cat # 1492-H5 or Phoenix Cat # UK 6, 3-HESI with LED
blown fuse indicators or equivalent with fuse rating and type determined by the Contractor.
Terminal blocks mounted in junction boxes and cabinets and shall be mounted on sheet steel
mounting back plates of 14 gauge thickness unless otherwise specified by the Contractor and approved
by the Owner. The mounting plate shall be finished with gloss white enamel or a white epoxy coating.
Terminal blocks and other devices, if required, shall be mounted by screws with drilled and tapped
mounting holes. Mounting of the back plate within the junction box shall be by nuts on a welded stud.
No mounting holes may penetrate the outside surface of the box or cabinet.
SECTION 45.05.25
ELECTRICAL ENGINEERING DESIGN STANDARD
PAGE 1 of 2
CABLE SHIELDING ISSUE
04/23/71
ELECTRICAL 600 VOLT INSULATED CIRCUITS DATE
ENGINEERING SWITCHRACKS, 138kV & ABOVE REVISION
SECTION 12/15/17
DATE
No Applicable National Standards Approved:
Based on Substation Practices Manager, Electrical Engineering
1.0 Purpose
This standard defines cable shielding practices for the protection of certain 600-volt insulated circuits
from transient overvoltages in stations with switchracks nominally rated 138kV or higher.
Circuits requiring shielding are defined in this standard as all control, current, potential, indicating,
alarm, or other circuits in high-voltage switchracks.
2.0 General
The need for cable shielding has increased with the use of solid-state devices in place of vacuum
tubes and electromechanical devices in protective relays, annunciators, and other equipment.
Sources of voltage surges and transients are outlined below:
1) Switching of lines and bus sections.

2) Switching of capacitor banks.
3) System faults.
4) Lightning strikes.
5) Induced voltages from magnetic devices.
Voltage transients in unshielded cables may far exceed 1000-volts at frequencies well over 200 kHz.
These voltages and frequencies will induce substantial voltages in adjacent parallel conductors if
they are not shielded.
Voltage transients are believed to increase with the cube of the bus or line voltage, making the
shielding of control cables mandatory to racks of 138kV and above.
To minimize the effects of induced transient overvoltages from energized high-voltage equipment,
the proper location of cable, ducts, trenches and conduit should be made in rack areas.
3.0 Installations Requiring Shielded Cable

3.1 New and Existing 138kV and above Installations
1) When a new 138kV and above switchrack or switchrack position is installed, all circuits
connected it shall be installed with shielded cable.
2) Replace unshielded cables from the switchracks with shielded cable when
electromechanical devices are replaced on cables from 138kV and above racks.
SECTION 45.05.25
PAGE 2 of 2
CABLE SHIELDING ISSUE
04/23/71
ELECTRICAL 600 VOLT INSULATED CIRCUITS DATE
ENGINEERING SWITCHRACKS, 138kV & ABOVE REVISION
SECTION 12/15/17
DATE
4.0 Grounding of Cable Shielding
The cable shield shall be grounded at one end only, except at 500kV. Refer to sub-section 5.1.2 in
the station design standard 45.00.35 for further information.
5.0 Circuit Design to Reduce Transient Voltages

5.1 Avoid loops when designing circuits and routing the cable.
1) The current return conductors must always be adjacent to the other conductors in the
circuit.
2) Interconnections between pieces of equipment must follow other conductors to and from
the devices, forming a tree configuration, rather than taking the shortest route that may
result in the formation of loops.
5.2 Spare conductors in unshielded cables shall be connected to the station ground at both ends.
5.3 Consider using transient suppressors where the need for shielded cable is questionable, and
when the cost of replacing existing cable with shielded cable does not seem justified.
NOTE: Transient suppressors may be damaged in service, and not show evidence that they
no longer give protection. Corrugated copper shielded cable is preferred.
SECTION 45.05.30
PAGE 1 of 2
WIRING-CONTROL, CABLE SHIELDING & ISSUE
05/08/73
ELECTRICAL GROUNDING DATE
ENGINEERING GENERATING STATIONS REVISION 08/28/17
SECTION DATE
1.0 Purpose
This standard defines cable shielding and grounding for Generating Stations. For a general guide to
the design and installation of cable systems in Generating Stations, refer to Design Standard
35.10.10.
2.0 General
The need for cable shielding has increased with the use of solid-state devices in place of vacuum
tubes and electromechanical devices in protective relays, annunciators, and other equipment.
Voltage transients in unshielded cables may far exceed 1000 volts at frequencies well over 200 kHz.
These voltages and frequencies will induce substantial voltages in adjacent parallel conductors if
they are not shielded and grounded properly.
3.0 Specific
3.1 Except where specific reasons dictate otherwise, follow these shielding recommendations:
1) One hundred percent coverage with drain wire is a more effective electrostatic shield than
braid or wire serving.
2) Low-level analog signal cables should be made up of twisted and shielded pairs.
3) Digital signal cables should be twisted and shielded. Where physical proximity of
terminations allow grouping, multi-conductor cables with overall shields can also be used.
Pulse type circuits should be wired with individual twisted and shielded pairs.
4) Cable shields should be electrically continuous. When two lengths of shielded cable are
connected together at a terminal block, a point on the terminal block should be used for
connecting the shields.
5) The shield of each cable should be covered with an insulating jacket in order to prevent
stray and multiple grounds to the shield.
SECTION 45.05.30
PAGE 2 of 2
WIRING-CONTROL, CABLE SHIELDING & ISSUE
05/08/73
ELECTRICAL GROUNDING DATE
ENGINEERING GENERATING STATIONS REVISION 08/28/17
SECTION DATE
3.2 Except where specific reasons dictate otherwise, follow these grounding recommendations:
1) All shields shall be grounded at one end only.
2) Digital signal circuits should not be grounded at any point external to the power supply.
3) The shields on grounded as well as ungrounded thermocouple circuits should be grounded

at or near the thermocouple well.
4) Multipair cables used with thermocouples should have individually insulated shields so
that each shield may be maintained at the particular couple ground potential.
5) Each RTD (resistance temperature detector) system consisting of one power supply and
one or more RTD’s should be grounded at only one point.
6) RTD’s embedded in windings of transformers and rotating machines should be grounded

at the frame of the respective equipment. A separate ungrounded power supply should be
furnished for each piece of equipment. Back-to-back-zener diodes or other devices which
prevent dangerous over-voltages from building up on the RTD circuits may allow
grounding away from the equipment frame.
7) When a signal lead is grounded, the low or negative potential side of the signal pair should
be grounded at the same point where the shield is grounded. Where a common power
supply is used, the low side of each signal pair and its shield should be grounded at the
power supply.
INDEX
SECTION 45.00.35
PAGE 5 of 7
CONTROL CABLE: ISSUE
6/16/86
ELECTRICAL DATE
INSTALLATION, DESIGNATION,
ENGINEERING REVISION
AND TERMINATION 12/15/17
SECTION DATE
National Standards: IEEE 525-2016 Approved:
Also Substation Practices Manager, Electrical Engineering
FIGURE 6 - Paralleling Control Cables

5.1.2 Termination and Grounding of Cable Shielding
Shielded control cable is required at switchyard voltage levels of 138kV and above for
control, protection, metering, and indication circuits. The cable shields shall be
grounded at one end only. For cable installations between switchyard equipment and
intermediate terminations (such as field terminal cabinets), shields shall be grounded at
the equipment end. For cable installations between field terminal cabinets and the
control room, shields shall be grounded at the control room end. Refer to Figure 7.
At switchyard voltage levels of 500kV and above, ground the cable shields at both ends
of the control cables. This includes all control cables installed within the switchyard as
well as all cables installed between switchyard equipment and the control room. Shields
shall be grounded at both ends for cables terminated within intermediate equipment
such as field terminal cabinets.
Shields of SCADA/RTU RS-232 and RS-485 communication cables shall be grounded

at the relay panel end only. Please refer to SCADA Design sections for additional
information.
Staged fault tests were performed at the 500 kV voltage level with the control cable
shield grounded at both ends. The results of these tests showed that the induced voltage
was cut in half to a safe level and that circulating currents were negligible. Circulating
currents were measured to be typically 1/10 of an amp.
INDEX
SECTION 45.00.35
PAGE 6 of 7
CONTROL CABLE: ISSUE
6/16/86
ELECTRICAL DATE
INSTALLATION, DESIGNATION,
ENGINEERING REVISION
AND TERMINATION 12/15/17
SECTION DATE
National Standards: IEEE 525-2016 Approved:
Also Substation Practices Manager, Electrical Engineering
FIGURE 7 - Termination and Grounding of Shielded Control Cables

Note: At all intermediate terminations ground the cable shield at one end only.
Several methods are currently accepted for grounding control cable shields. These include soldering shields,
installing spring-clamps, spiral-wound shielding, and braided shielding. Listed below are the steps for the proper
installation of cable shield spring clamps. These should be followed in addition to manufacturer’s recommended
installation instructions:
1) The cable shield needs to be correctly cleaned to remove any glue, rubber, or any contaminates.
2) To prevent corrosion or a bad connection due to dirt or moisture, apply a SMALL dab of “No-OX” or
an equivalent on the existing shield to eliminate any voids and provide a good electrical connection (do
not apply too much to avoid making a mess on the cable being worked on, or adjacent cabling and
equipment).
3) Correctly wrap the spring clamp (over and back) to prevent the bleed wire from becoming detached from
the cable.
4) The bleed wire that is attached should be with an insulated wire, or a braid that has insulation placed
over it. This allows control of the shields (single point grounds, and prevents bleed wires from
contacting hot circuits).
5) Tape over the shield with electrical tape.
6) Attach a section of heat shrink over the completed connection.
7) Appropriately label or ID the cable with a number.
For installation instructions for the other shield ground methods, please refer to the applicable DWP
Construction Standards.
SECTION 45.05.45
PAGE 1 of 1
ISSUE
WIRING-EQUIPMENT AND CONTROL 11/10/66
ELECTRICAL DATE
ENGINEERING TERMINAL CABINET & BLOCK DESIGNATIONS REVISION 10/17/14
SECTION
Based on Substation Practices Manager, Substation Engineering
1.0 Purpose
This standard gives the preferred designations for terminal cabinets and associated terminal blocks.
The illustration below indicates Terminal Cabinet “A” with its associated terminal blocks.
2.0 General
Additional cabinets should be designated TCB, TCC, etc. A terminal cabinet “A” in the relay room
could be designated TCRA. A terminal cabinet “C” in the terminal room could be designated TCTC.
Columns of terminal blocks, 10 points minimum to 100 points maximum, shall be numbered from
left to right, T1, T2, T3...Tn. Individual blocks are standardized at 10 points. Purchases should be for
this type of block. Column numbering for each cabinet shall begin with T1.
Terminals in a terminal block shall be numbered vertically in ascending order, top to bottom, with
Terminal 1 at the top of each column as shown.
TCA

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IPP Renewal Project Synchronous Condensers EPC Contract Issue

196137.73.0213 Technical Specification 21OCT2021

01624.5 Power and Control Wiring

01624.5.1 Design Conditions

Confinement of the dielectric field within the cable.

Obtaining a symmetrical radial distribution of voltage stress within the dielectric.

Compliance with ICEA recommendations for shielding.

Reducing the hazard of shock to personnel.

Allowing circuits to be dc high potential tested after installation.

The shields on grounded, as well as ungrounded thermocouple circuits, shall be grounded at

01624.5.3 Cable Constructions

Table 01624-6 Cable Construction

Table 01624-6 Cable Construction

Table 01624-7 Cable Configurations*

Interior or above ground exterior 120 V/277 V

If concealed behind walls or above ceiling plenums

Minimum conductor size shall be 12 AWG.

Special cable shall be routed in accordance with manufacturer's recommendations.

01624.5.3.15.1 Alternative Insulation. Flame retardant ethylene-propylene rubber which is in

Tensile strength, minimum, psi: 1,400.

Tensile stress at 100 percent elongation, minimum psi: 1,000.

Elongation at rupture. Minimum percent: 150.

After air oven at 121° C ± 1° C for 168 hours:

After oil immersion test at 100° C ± 1° C for 18 hours:

Heat shock at 121° C ± 1° C: No cracks.

Cold bend at minus 35° C ± 1° C: No cracks.

Manufacturer’s cable number.

01624.5.4 Testing Requirements

Specific surface resistivity, minimum, megohms: 200,000.

Halogen content of the jackets shall not exceed 18 percent by weight.

01624.5.5 Cable Installation

Cable segregation requirements shall be maintained, if required by OEM..

All communication cables shall be routed in conduit or in a separate wireway dedicated to

Vertical Cable Support Spacing

Install terminals or terminal connectors as required, ensuring a firm metal-to-metal contact.

One half-lapped layer of varnished cambric tape.

Installation shall be in accordance with NEC.

Installation shall be accomplished by qualified personnel trained to accomplish high voltage

Origin and destination of the circuit (from-to).

Circuit routing by raceway number of actual installed route.

Cable type, size, and quantity.

Cable reel identification number.

Date circuit installation was completed.

Foreman of pulling crew.

Maximum pulling tension if not pulled by hand.

Materials containing asbestos shall not be used.

No more than two conductors shall be terminated at one connection point.

Terminal blocks shall meet the requirements in the following table.

Feed- General Purpose Strap Screw, Grouped Block,

Sources of voltage surges and transients are outlined below:

1) Switching of lines and bus sections.

3.0 Installations Requiring Shielded Cable

4.0 Grounding of Cable Shielding

5.0 Circuit Design to Reduce Transient Voltages

1) All shields shall be grounded at one end only.

3) The shields on grounded as well as ungrounded thermocouple circuits should be grounded

6) RTD’s embedded in windings of transformers and rotating machines should be grounded

FIGURE 6 - Paralleling Control Cables

Shields of SCADA/RTU RS-232 and RS-485 communication cables shall be grounded