Ansinema c29!5!2015 Watermarked
Ansinema c29!5!2015 Watermarked
Ansinema c29!5!2015 Watermarked
5-2015
Secretariat:
ANSI/NEMA C29.5-2015
Page i
AMERICAN
NATIONAL
STANDARD
Published by
ANSI/NEMA C29.5-2015
Page ii
FOREWORD
(This Foreword is not part of American National Standard C29.5-2015)
The first edition of this standard was based essentially on the EEINEMA (Edison Electric InstituteNational Electrical Manufacturers Association) standards for Wet-Process Porcelain Insulators (Low- and
Medium-Voltage Pin Type), EEI TDJ-55, NEMA 143-1952. Subsequent revisions have been developed by
the Standards Committee on Insulators for Electric Power Lines, C29.
The principal differences between this edition and the previous (1984) edition are revisions to the color
and marking requirements, addition of more specific requirements for conductor groove dimensions, and
a change in the acceptance criteria for the cantilever strength test.
Suggestions for improvement of this standard are welcomed. They should be sent by the date of its next
scheduled revision (December 31, 2020) to:
Senior Technical Director, Operations
National Electrical Manufacturers Association
1300 North 17th Street, Suite 900
Rosslyn, VA 22209
This standard was processed and approved for submittal to ANSI by Accredited Standards Committee
(ASC) on Insulators for Electric Power Lines, C29. Committee approval of the standard does not
necessarily imply that all committee members voted for approval. At the time it approved this standard, the
ASC C29 Committee had the following members:
A. Jagtiani, Chairman
G. Winstanley, Secretary
Organization Represented:
Name of Representative:
E. Cleckley
B. Freimark
M. Garrels
R. Kluge
K. Reese
M. Gray (alt)
D. Mar (alt)
T. Rao (alt)
A. Shkuratkov (alt)
T. Grisham
N. DeSantis
A. Jagtiani
J. Kuffel
T. Shaw
J. George (alt)
J. Varner (alt)
ANSI/NEMA C29.5-2015
Page iii
Organization Represented:
Name of Representative:
A. Baker
R. Bernstorf
A. Schwalm
T. Van Remmen
G. Stewart
E. Niedospial (alt)
P. Maloney (alt)
D. Liebhaber
J. Havel (alt)
J. Nelson
R. Stargel (alt)
R. Clark
ANSI/NEMA C29.5-2015
Page iv
Contents
Foreword ....................................................................................................................................................... ii
1
Scope .................................................................................................................................................... 1
Definitions ............................................................................................................................................ 1
General ................................................................................................................................................. 1
Material ................................................................................................................................................. 1
Marking................................................................................................................................................. 2
General............................................................................................................................................. 2
8.2
8.3
8.4
Appendix ..................................................................................................................................................... 13
Figures
Figure 1 Pin Insulator, Class 55-1 ................................................................................................................ 5
Figure 2 Pin Insulator, Class 55-2 ................................................................................................................ 6
Figure 3 Pin Insulator, Class 55-3 ................................................................................................................ 7
Figure 4 Pin Insulator, Class 55-4 ................................................................................................................ 8
Figure 5 Pin Insulator, Class 55-5 ................................................................................................................ 9
Figure 6 Pin Insulator, Class 55-6 .............................................................................................................. 10
Figure 7 Pin Insulator, Class 55-7 .............................................................................................................. 11
Figure 8 Insulator Thread Gauge ............................................................................................................... 12
Table
Table 1
ANSI/NEMA C29.5-2015
Page 1
Scope
This standard covers low- and medium-voltagetype insulators made of wet-process porcelain and used in
the transmission and distribution of electric energy.
Referenced Standards
This standard is intended for use in conjunction with the latest approved revisions of the following American
National Standards:
ANSI C29.1
ANSI C29.6
ASTM D 1535
Definitions
General
4.1
Insulators shall conform in all respects to the requirements of this standard. The text and figures
supplement each other and shall be considered part of this standard.
4.2
Manufacturers drawings, if furnished, shall show the outline of the insulators, together with all
pertinent dimensions. Any variations in these dimensions due to manufacturing tolerances shall be indicated.
4.3
When specified in the clauses below, the following re-test procedure applies:
If only one insulator fails to comply with the applicable test, a new sample equal to twice the quantity
originally submitted to that test shall be subjected to retesting. If two or more insulators fail to comply, or if
any failure occurs during the retesting, the complete lot is considered as not complying with the
requirements of this standard.
Material
5.1
The insulators shall be made of commercial-grade wet-process porcelain that meets the mechanical
and electrical requirements of this standard.
5.2
The surface of the shells exposed after the assembly shall be glazed for porcelain insulators.
Note: The most commonly requested color for porcelain is gray. If gray is required, it shall be in accordance with
ASTM D 1535, Standard Practice for Specifying Color by the Munsell System, and shall conform to Munsell notation
5BG 7.0/0.4 with the following tolerances:
a)
b)
c)
Other colors are available and can be negotiated between purchaser and supplier.
6.1
Figures 1-7 are drawings of insulator types. Dimensions and characteristics of the insulators shall be
in accordance with these figures.
2015 National Electrical Manufacturers Association
ANSI/NEMA C29.5-2015
Page 2
6.2
When specified, neck designations shall be as shown in Table 1. All surfaces that might come in
contact with conductors or tie wires must be rounded to prevent abrasion, cracking, or metal fatigue.
The minimum depth of the top conductor groove shall be 0.5 inches for Class 55-2 and Class 55-3 insulators.
It shall be 0.6 inches for Class 55-4 and Class 55-5 insulators. It shall be 0.7 inches for Class 55-6 and Class
55-7 insulators.
The length of the top conductor groove shall not exceed the maximum neck diameter by more than 0.12
inches.
6.3
All dimensions and other numerical values are given in customary English units. Metric equivalents
are given in parentheses for certain characteristics.
Table 1
Neck Designations and Dimensions
Designation
Letter
A
C
F
J
K
N
Diameter
(in.)
1
2
2
3
4
6
Groove-Height
Relationship,
as Applicable (in.)
Minimum Maximum
9
/16
9
/16
/16
Diameter
(mm)
45 3
57 3
73 3
89 3
102 3
152 3
Groove-Height
Relationship,
as Applicable (mm)
Minimum Maximum
14
22
14
22
6
16
6
16
14
22
Marking
Each insulator shall include markings to identify: manufacturer, the ANSI class number or catalog number,
and a time/lot reference (as a minimum, the month and year that the item was produced). The marking shall
be legible and durable.
8.1
GENERAL
Tests described in 8.2 shall be required only on Insulators of new designs. Tests described in 8.3 shall be
required on each lot of insulators. Tests described in 8.4 shall be made on each insulator.
8.2
DESIGN TESTS
8.2.1
Three insulators shall be selected at random and tested in accordance with Section 4.2 of ANSI C29.1,
Low-Frequency Dry Flashover Test. Failure of the average dry flashover value of the three insulators to
equal or exceed 95% of the rated dry flashover value, as given in the applicable figure, shall constitute failure
to meet the requirements of this standard.
8.2.2
Three insulators shall be selected at random and tested in accordance with Section 4.3 of ANSI C29.1, LowFrequency Wet Flashover Test. Failure of the average wet flashover value of the three insulators to equal or
exceed 90% of the rated wet flashover value, as given in the applicable figure, shall constitute failure to meet
the requirements of this standard.
ANSI/NEMA C29.5-2015
Page 3
8.2.3
Three insulators shall be selected at random for the critical impulse flashover test, positive, and three for the
critical impulse flashover test, negative, and tested in accordance with Section 4.7 of ANSI C29.1, Impulse
Flashover Voltage Tests. Failure of the average critical impulse flashover value of the three insulators to
equal or exceed 92% of the rated critical impulse flashover value, as given in the applicable figure, shall
constitute failure to meet the requirements of this standard.
8.2.4
Five insulators shall be selected at random and tested in accordance with Section 4.9 of ANSI C29.1, RadioInfluence Voltage Tests. If one or more insulators fails to meet the requirements given in the applicable
figure, five additional insulators shall be selected at random and tested. Failure of one or more of these
additional insulators shall constitute failure to meet the requirements of this standard.
8.2.5
Cantilever-Strength Test
Five insulators shall be randomly selected and tested in accordance with 5.1.3 of ANSI C29.1, Line
Insulators (Pin, Post) (Cantilever Strength). Failure of the strength of any of the five insulators to meet the
strength requirement given in the applicable figure shall constitute failure to meet the requirements of this
standard. The re-test procedure in Section 4.3 is applicable to this test.
8.2.6
Five insulators shall be selected at random and tested for ten complete cycles in accordance with 5.5 of
ANSI C29.1, Thermal Test. The temperature of the hot water bath shall be approximately 150F (66C),
and the temperature of the cold water bath shall be approximately 39F (4C). If one or more insulators fails,
five additional insulators shall be selected at random and tested. Failure of one or more of these additional
insulators shall constitute failure to meet the requirements of this standard.
8.3
8.3.1
Dimensional Test
Three insulators shall be selected at random from the lot and their dimensions checked against the
dimensions on the manufacturers drawing. Failure of more than one of these insulators to conform, within
manufacturing tolerances, to the dimensions on this drawing shall constitute failure of the lot to meet the
requirements of this standard.
8.3.2
Visual Test
If visual inspection is required on lots of 500 or more insulators, 50 insulators shall be selected at random
from the lot. If more than four but fewer than 10 of the insulators fail to meet the requirements of 5.2, 100
additional insulators shall be selected at random from the same lot. Failure of more than a total of 10
insulators from both the first and second samples shall constitute failure of the lot to meet the requirements
of this standard.
8.3.3
Porosity Test
A minimum of three specimen samples shall be selected from insulators destroyed in other tests and tested
in accordance with 5.4 of ANSI C29.1, Porosity Test. Penetration of the dye into the body of the dielectric
shall constitute failure of the lot to meet the requirements of this standard.
8.3.4
Pinhole-Gauging Test
Fifteen insulators shall be selected at random and gauged with a gauge similar to that shown in Figure 8 (see
page 15). The insulators shall be tested in accordance with 5.6.2 of ANSI C29.1, Pinhole-Gauging Test.
The clearance between the top of the gauge and the crown of the pinhole cavity shall be not less than inch
nor more than inch. The number of turns required to disengage the insulator from the gauge shall average
not less than three for the entire sample nor be less than 2 for any one insulator. If more than one insulator
fails to meet this requirement, 30 additional insulators shall be selected at random and gauged. Failure of
more than a total of three insulators from both the first and second samples shall constitute failure of the lot
to meet the requirements of this standard.
2015 National Electrical Manufacturers Association
ANSI/NEMA C29.5-2015
Page 4
8.3.5
Puncture Test
Three insulators shall be selected at random and tested in accordance with 4.11 of ANSI C29.1, Puncture
Test. If the average puncture voltage of the three insulators fails to meet the requirement given in the
applicable figure, or if the percent average variation exceeds 15%, this shall constitute failure of the lot to
meet the requirements of this standard.
8.4
Each insulator shall be subjected to a routine flashover test in accordance with 7.1 of ANSI C29.1, Routine
Test. All insulators that puncture fail to meet the requirements of this standard.
ANSI/NEMA C29.5-2015
Page 5
NOTES:
(1) C neck
(2) All dimensions are in inches.
(3) If high-resistance coatings are applied to the insulator, such coatings shall be considered as effective
leakage surfaces, and the distance over them shall be included in the leakage distance.
(4) Side-wire groove shall seat a mandrel with a diameter of 15/16 inch.
Rating
Dimensions
Leakage distance, in. (mm)
Dry-arcing distance, in. (mm)
Minimum pin height, in. (mm)
Mechanical Values
Cantilever strength, lbs (kN)
Electrical Values
Low-frequency dry flashover, kV
Low-frequency wet flashover, kV
Critical impulse flashover, positive, kV
Critical impulse flashover, negative, kV
Low-frequency puncture voltage, kV
Radio-Influence Voltage Data
Low-frequency test voltage, rms to ground, kV
Maximum RIV at 1000 kHz
Radio freed, microvolts
Plain, microvolts
4 (100)
2 (57)
4 (100)
2.5.2
2.5.3
3000 (13)
5.1.3
35
20
50
70
50
4.2
4.3
4.7
4.7
4.11
4.9
50
2500
4.9
4.9
Figure 1
Pin Insulator, Class 55-1
ANSI/NEMA C29.5-2015
Page 6
NOTES:
(1) C neck
(2) All dimensions are in inches.
(3) If high-resistance coatings are applied to the insulator, such coatings shall be considered as effective
leakage surfaces, and the distance over them shall be included in the leakage distance.
(4) Top- and side-wire groove shall seat a mandrel with a diameter of 13/16 inches.
Rating
Radio
Plain
Freed
Dimensions
Leakage distance, in. (mm)
Dry-arcing distance, in. (mm)
Minimum pin height, in. (mm)
Mechanical Values
Cantilever strength, lbs (kN)
Electrical Values
Low-frequency dry flashover, kV
Low-frequency wet flashover, kV
Critical impulse flashover, positive, kV
Critical impulse flashover, negative, kV
Low-frequency puncture voltage, kV
Radio-Influence Voltage Data
Low-frequency test voltage, rms to ground, kV
Maximum RIV at 1000 kHz, microvolts
5 (127)
3 (86)
4 (100)
5 (127)
3 (86)
4 (100)
2.5.2
2.5.3
-
2500 (11)
2500 (11)
5.1.3
50
25
75
95
70
45
25
70
85
70
4.2
4.3
4.7
4.7
4.11
5
2500
5
50
4.9
4.9
Figure 2
Pin Insulator, Class 55-2
ANSI/NEMA C29.5-2015
Page 7
NOTES:
(1) C neck
(2) All dimensions are in inches.
(3) If high-resistance coatings are applied to the insulator, such coatings shall be considered as effective
leakage surfaces, and the distance over them shall be included in the leakage distance.
(4) Top- and side-wire groove shall seat a mandrel with a diameter of 11/16 inches.
Rating
Dimensions
Leakage distance, inches (mm)
Dry-arcing distance, inches (mm)
Minimum pin height, inches (mm)
Mechanical Values
Cantilever strength, pounds (kN)
Electrical Values
Low-frequency dry flashover, kV
Low-frequency wet flashover, kV
Critical impulse flashover, positive, kV
Critical impulse flashover, negative, kV
Low-frequency puncture voltage, kV
Radio-Influence Voltage Data
Low-frequency test voltage, rms to ground, kV
Maximum RIV at 1000 kHz, microvolts
Plain
Radio
Freed
See American
National Standard
C29.1
7 (178)
4 (114)
5 (127)
7 (178)
4 (114)
5 (127)
2.5.2
2.5.3
-
2500 (11)
2500 (11)
5.1.3
65
35
100
130
90
55
30
90
110
90
4.2
4.3
4.7
4.7
4.11
10
5500
10
50
4.9
4.9
Figure 3
Pin Insulator, Class 55-3
ANSI/NEMA C29.5-2015
Page 8
NOTES:
(1) F neck
(2) All dimensions are in inches.
(3) If high-resistance coatings are applied to the insulator, such coatings shall be considered as effective
leakage surfaces, and the distance over them shall be included in the leakage distance.
(4) The side-wire groove shall seat a mandrel with a diameter of 11/16 inches, but shall not seat a mandrel
with a diameter of 1 inches. The top wire groove shall seat a mandrel with a diameter of 1 inches.
Rating
Radio
Plain
Freed
Dimensions
Leakage distance, in. (mm)
Dry-arcing distance, in. (mm)
Minimum pin height, in. (mm)
Mechanical Values
Cantilever strength, lbs (kN)
Electrical Values
Low-frequency dry flashover, kV
Low-frequency wet flashover, kV
Critical impulse flashover, positive, kV
Critical impulse flashover, negative, kV
Low-frequency puncture voltage, kV
Radio-Influence Voltage Data
Low-frequency test voltage, rms to ground, kV
Maximum RIV at 1000 kHz, microvolts
9 (228)
5 (127)
5 (127)
9 (228)
5 (127)
5 (127)
2.5.2
2.5.3
-
3000 (13)
3000 (13)
5.1.3
70
40
110
140
95
65
35
105
130
95
4.2
4.3
4.7
4.7
4.11
10
5500
10
50
4.9
4.9
Figure 4
Pin Insulator, Class 55-4
ANSI/NEMA C29.5-2015
Page 9
NOTES:
(1) F neck
(2) All dimensions are in inches.
(3) If high-resistance coatings are applied to the insulator, such coatings shall be considered as effective
leakage surfaces, and the distance over them shall be included in the leakage distance.
(4) The side-wire groove shall seat a mandrel with a diameter of 11/16 inches, but shall not seat a mandrel
with a diameter of 1 inches. The top wire groove shall seat a mandrel with a diameter of 1 inches.
Rating
Dimensions
Leakage distance, in. (mm)
Dry-arcing distance, in. (mm)
Minimum pin height, in. (mm)
Mechanical Values
Cantilever strength, lbs (kN)
Electrical Values
Low-frequency dry flashover, kV
Low-frequency wet flashover, kV
Critical impulse flashover, positive, kV
Critical impulse flashover, negative, kV
Low-frequency puncture voltage, kV
Radio-Influence Voltage Data
Low-frequency test voltage, rms to ground, kV
Maximum RIV at 1000 kHz, microvolts
Plain
Radio
Freed
See American
National Standard
C29.1
12 (304)
6 (159)
6 (152)
12 (304)
6 (159)
6 (152)
2.5.2
2.5.3
-
3000 (13)
3000 (13)
5.1.3
85
45
140
170
115
80
45
130
150
115
4.2
4.3
4.7
4.7
4.11
15
8000
15
100
4.9
4.9
Figure 5
Pin Insulator, Class 55-5
ANSI/NEMA C29.5-2015
Page 10
NOTES:
(1) J neck
(2) All dimensions are in inches.
(3) If high-resistance coatings are applied to the insulator, such coatings shall be considered as effective
leakage surfaces, and the distance over them shall be included in the leakage distance.
(4) The side-wire groove shall seat a mandrel with a diameter of 1inches, but shall not seat a mandrel with
a diameter of 17/16 inches. The top wire groove shall seat a mandrel with a diameter of 1 inches.
Dimensions
Leakage distance, in. (mm)
Dry-arcing distance, in. (mm)
Minimum pin height, in. (mm)
Mechanical Values
Cantilever strength, lbs (kN)
Electrical Values
Low-frequency dry flashover, kV
Low-frequency wet flashover, kV
Critical impulse flashover, positive, kV
Critical impulse flashover, negative, kV
Low-frequency puncture voltage, kV
Radio-Influence Voltage Data
Low-frequency test voltage, rms to ground, kV
Maximum RIV at 1000 kHz
Radio freed, microvolts
Plain, microvolts
Rating
15 (381)
8 (203)
7 (190)
2.5.2
2.5.3
-
3000 (13)
5.1.3
100
50
150
170
135
4.2
4.3
4.7
4.7
4.11
22
4.9
100
8000
4.9
4.9
Figure 6
Pin Insulator, Class 55-6
ANSI/NEMA C29.5-2015
Page 11
NOTES:
(1) J neck.
(2) All dimensions are in inches.
(3) If high-resistance coatings are applied to the insulator, such coatings shall be considered as effective
leakage surfaces, and the distance over them shall be included in the leakage distance.
(4) The side-wire groove shall seat a mandrel with a diameter of 1inches, but shall not seat a mandrel with
a diameter of 17/16 inches. The top wire groove shall seat a mandrel with a diameter of 1 inches.
(5) For thread gauge, see Figure 6 of ANSI C29.6.
Dimensions
Leakage distance, in. (mm)
Dry-arcing distance, in. (mm)
Minimum pin height, in. (mm)
Mechanical Values
Cantilever strength, lbs (kN)
Electrical Values
Low-frequency dry flashover, kV
Low-frequency wet flashover, kV
Critical impulse flashover, positive, kV
Critical impulse flashover, negative, kV
Low-frequency puncture voltage, kV
Radio-Influence Voltage Data
Low-frequency test voltage, rms to ground, kV
Maximum RIV at 1000 kHz
Radio freed, microvolts
Plain, microvolts
Rating
15 (381)
8 (203)
7 (190)
2.5.2
2.5.3
-
3000 (13)
5.1.3
100
50
150
170
135
4.2
4.3
4.7
4.7
4.11
22
4.9
100
8000
4.9
4.9
Figure 7
Pin Insulator, Class 55-7
ANSI/NEMA C29.5-2015
Page 12
NOTES:
(1) All dimensions are in inches.
(2) Unless otherwise specified, a tolerance of 0.002 in. (0.05 mm) is allowed on all fractional dimensions.
(3) Round all sharp corners to not more than 0.005-inch radius (0.12 mm).
Figure 8
Insulator Thread Gauge
ANSI/NEMA C29.5-2015
Page 13
APPENDIX
(This Appendix is not part of American National Standard C29.5-2015, but is included for information
only.)
General Information
Packaging of insulators should be such as to afford reasonable and proper protection to the insulators in
shipping and handling.
Each box or container should be marked with the number of insulators contained therein, the catalog
number, class number, or a description of the contents, and the manufacturers name.
Manufacturers should maintain records of the plant in which the insulator was produced.