I need some guidence on the requirements of grounding of a fence around a highvoltage switch and transformer 4160volt. I know the gate needs to have braided grounds but cant find the code. What is the cleareance between the switch hinged door and the transformer next to in ?? THANKS
Grounding fence
- Thread starter j rae
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- Placerville, CA, USA
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- Retired PV System Designer
Is this a POCO or customer transformer? The applicable code depends on that.
NESC describes the result which must be delivered while NEC prescribes the methods that must be used.
For NESC they rely mostly on an IEEE standard on substation grounding for best practice information, so you may want to look there.
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- Wisconsin
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- PE (Retired) - Power Systems
Even more important(?), is this equipment with exposed live parts (e.g. overhead conductors), or is is totally enclosed (e.g. padmount construction)?
beanland
Senior Member
- Location
- Vancouver, WA
IEEE 80
IEEE 80
What is required is not covered in the NEC. Utilities follows the NESC and use IEEE 80. The whole issue is to control step and touch potentials.
In general, the fence is bonded to the ground grid every other post. The ground wire is woven through the fence fabric and clamped to it. If there is barbed wire, each strand must be clamped to the ground wires. There is normally a buried ground wire extending ?3 ft outside the fence so when touching the fence, you are standing above the ground.
There is no cut-and-dried answer, engineering is needed.
IEEE 80
What is required is not covered in the NEC. Utilities follows the NESC and use IEEE 80. The whole issue is to control step and touch potentials.
In general, the fence is bonded to the ground grid every other post. The ground wire is woven through the fence fabric and clamped to it. If there is barbed wire, each strand must be clamped to the ground wires. There is normally a buried ground wire extending ?3 ft outside the fence so when touching the fence, you are standing above the ground.
There is no cut-and-dried answer, engineering is needed.
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