Earthing guideline in hazardous area
Earthing
is required for –
·
Safety of working personnel
·
Equipment safety
·
Protection against fault
Size of earth conductor
Sr.no.
|
Type
of equipment
|
Earth
conductor size
|
1
|
Street
light poles
|
10
mm dia solid GI wire rope
|
2
|
Motor
upto 3.7KW
|
8
SWG solid GI wire
|
3
|
Motor
upto 5.5KW to 30KW & welding receptacle
|
10
mm dia solid GI wire rope
|
4
|
Motor
above 37KW including HT motor
|
16
mm dia solid GI wire rope / 40mm x5 mm GI strip
|
5
|
Building
columns
|
40mm
x 5 mm GI strip
|
6
|
Storage
tank vertical or horizontal
|
40mm
x 5 mm GI strip
|
7
|
Loading
racks
|
40mm
x 5 mm GI strip
|
8
|
Pipe
racks, heat exchanger, Vessel
|
40mm
x 5 mm GI strip
|
9
|
Small
equipments and instruments
|
8
SWG solid GI rope
|
10
|
Lighting,
power and instrument panel
|
10
mm dia solid GI wire rope
|
11
|
Main
earth bus /MV &HV switchgear interconnection /power transformer
|
As
per calculation
|
12
|
EHV/HV
substation
|
As
per calculation
|
13
|
Push
button station
|
8
SWG solid GI wire
|
14
|
Bonding
of pipe
|
25
mm2 insulated flexible copper cable
|
15
|
Lighting
transformer
|
16
mm dia solid GI wire rope
|
General:
1. Earth
connections to individual equipment from nearest earth plate/ grid may also be
done alternatively using Aluminum/ Copper conductor PVC insulated core of size
not less than half the cross-section of respective power cable to the equipment
(Motor, Panel etc.). Connections shall be made using crimped type of lugs.
2. Earth rods and conductors
shall be designed to cope with the conditions imposed. The earth conductor
shall be adequately sized to carry the applicable maximum earth fault current
without undue temperature rise. All joints shall be protected against
corrosion.
3. All the electrical equipment
operating above 250 volts shall have two separate and distinct connections to
earth grid.
4. Lighting Fixtures shall be
earthed through the extra core provided in the lighting cable.
5. The cross sectional area of earthing conductor
shall be minimum 4 sqmm.
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