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grounding substation Bollards

grounding substation Bollards

grounding substation Bollards

(OP)
Does anyone know if bollards in a eletric utility substation must be grounded.  The Bollards are 4 inch diameter steel pipes filled with concrete, which are used as a protective barriers for equipment.  There is an extensive ground grid in the sub to which the bollards are not currently connected.  I'm reviewing IEEE-80 for clarification.  Any ideas?

RE: grounding substation Bollards

I would say they need to be bonded to the ground grid, just like any other piece of steel structure.  

RE: grounding substation Bollards

I wouldn't bother.  They are not likely to get energized and still be in a position that someone could touch them without touching whatever is energizing them.

RE: grounding substation Bollards

During a fault, there could be a potential difference between the earth where the bollard is installed and the grounded equipment that could be nearby.  



RE: grounding substation Bollards

I would consider then equivalent to metal fence posts. Ground them. I was on a 25MVA sub last summer. The plans called for bollards and called for them to be grounded. I can not think of a piece of metal inside the substation fence that was not grounded.

Bill
--------------------
"Why not the best?"
Jimmy Carter

RE: grounding substation Bollards

I ground the bollards on all my MV equipment including bollards for oil filled padmount transformers, MV switchgear, etc. at industrial sites.   

If this is a true electric utility substation everything inside the fence including the fence is grounded at least for the specifications of the two utilities for which I have done work.

RE: grounding substation Bollards

Not only ground, but visibly grounded.  Upon first entering the substation one is to check to make sure that all grounds are present and accounted for; missing grounds to be reported immediately.  Crews wouldn't work around an ungrounded bollard.

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