Raft Deepening Area

expected Trench
from Transformer to
LV room
The DEWA rule book recommends for trench for the cables to Transformer and From transformer to LV panel room .
Attached here Attachment 1 with the Regulation of the room.
Since the area above the Transformer room is plantation area / Wet area , there should be additional requirements
for the roof also.
Attachment 2 - for the LV room Door Size .
To get clarification on all this, We request for the DEWA approved drawing to make sure the Electrical Room is as per
DEWA standard.
REGULATIONS FOR ELECTRICAL INSTALLATIONS
Attachment 1
APPENDIX 13
GENERAL CONDITIONS/REQUIREMENTS FOR PROVISION OF ATTIC SLAB ABOVE
SUBSTATION AND LV ELECTRICAL ROOM.
(Refer section 11 of Regulations)
In principle there shall not be any wet facilities above the substation/Ring Main Unit Room/LV
electrical room. Only in exceptional unavoidable cases this may be allowed at the discretion of the
Authority and the following requirements must be fulfilled:
1. A Reinforced Concrete Attic slab above the entire substation/Ring Main Unit Room/LV
electrical room shall be provided.
2. The entire attic slab and floor slab above including the vertical sides above attic slab shall
be waterproofed by an approved system.
3. The consultant shall be fully responsible for supervision of the waterproofing works, during
execution and testing of waterproofing.
4. All pipes, joints, trap, etc. running in wet areas shall be wrapped with approved
Waterproofing membrane.
5. The void between floor and attic slab shall be minimum 60cms clear height. Access to the
void above attic slab shall be 120cm x 60cm fitted with aluminum louvered door. The void
shall not be used for any other purpose and shall have permanent lighting arrangement.
Drain pipe to be provided for the attic slab to drain out any water leakage through floor slab.
Tiles are not compulsory above attic slab.
6. The consultant shall forward complete floor plans showing location of Wet Area and
substation/Ring Main Unit Room/LV electrical room. Extent of attic slab shall be clearly
marked in the plans. Typical cross sections through the Wet Area/ substation/Ring Main
Unit Room/LV electrical room and Attic Slab shall be shown in the drawings including
waterproofing arrangement/systems/materials.
7. Refer checklist below for attic slab construction:
Sr. No Description
1 Reinforced concrete attic slab above entire substation/ring main unit/LV
2 A clear depth (void) of 600mm between attic slab and floor slab.
An access aluminum louvered door of 1200x600mm to above clear depth

3
(void) from outside substation
4 Water proofing of attic slab , floor slab above attic slab and vertical side walls
5 Water proofing of attic slab , floor slab above attic slab and vertical side walls
6 Drain pipe of 1.5” dia projecting out of the attic slab
2017 EDITION 121

REGULATIONS FOR ELECTRICAL INSTALLATIONS Attachment 1
7 Water proofing of all pipe joints, traps etc running in wet areas
8 Lighting inside the void space
9 Drawings showing the above details attached
10 Guarantee letter
11 No high pressure and vertical pipes are to pass in the void area
12 PVC tray to be provided and slope is 1:100 towards the drain pipe
2017 EDITION 122

Attachment 1
APPENDIX 14
GENERAL DIMENSIONAL DETAILS OF SUBSTATIONS WITHIN BUILDINGS
(Refer section 11 of Regulations)
2017 EDITION 123

Attachment 2
APPENDIX 3
D-1 TYPICAL ELECTRICAL SERVICES ROOM WITH 1 NO. CUBICLE TYPE LV. SWITCHBOARD /
PANEL.
(Refer section 3 of the regulation)
Description :
1) LV Switchboard / Panel.
2) Capacitor Bank.
3) Sub Main Distribution Board (Sample).
4) KWh meters.
5) Non-maintained, minimum 3 Hrs. rated, self contained emergency light.
6) Light ﬁtting.
7) Non-combustible door.
Notes :
• All dimensions noted are in meters and not to scale.
• Minimum front clearance – 1.5 mtrs.
Rear & side clearance – 0.75 mtrs.
• The minimum clear space shown at the sides and rear of the panel is for switchboards with
rear access requirements only.
2017 EDITION 99

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expected Trench

7. Refer checklist below for attic slab construction:

1 Reinforced concrete attic slab above entire substation/ring main unit/LV

An access aluminum louvered door of 1200x600mm to above clear depth

6 Drain pipe of 1.5” dia projecting out of the attic slab

2017 EDITION 121

8 Lighting inside the void space

9 Drawings showing the above details attached

2017 EDITION 122

2017 EDITION 123

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