Bonding Support Columns / Equipment to GES

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WittCR

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Seattle, WA, USA
Friends, I have a couple questions


  • I see a lot of outdoor support racks for piping and conduit/cable tray in industrial facilities that are bonded to the plant grounding electrode system at regular intervals. (Sometimes every column)
    Does this support steel - sometimes a continuous rack, sometimes individual T-poles - count as 'exposed structural metal likely to become energized' as defined in NEC 250.104(C), or does it not apply due to not being part of a building? If not, is there a code basis for bonding the supports in this way? Or does anyone know of any recommended practice documentation to support it?


  • In addition, all electrical equipment is provided with a local bonding jumper to the GES (in addition to an equipment grounding conductor)
    Similar to the previous question - does anyone know of a recommended practice that supports this? I'm pretty positive NEC is okay with just the EGC.

In these heavy industrial facilities, it makes sense to me that it is the standard - as they are trying to go the extra mile in pursuing an equipotential environment, but I was wondering if anyone knew of any documentation to back it up.

Cheers!
 
it is not unusual to see a 2/0 or so sized bonding jumper that attached to the GES in industrial plants and goes out to all the various outside structures and pieces of equipment.

where it is code or not is something else.

as for bonding to the EGC, in general it seems to me that the conduit or cable tray itself serves that purpose.
 
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