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Joined: Jun 2002
Posts: 186
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mj Offline OP
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guys, I need help with this ons... given a large multifamliy dwelling unit has (2) services, The building has a (2)hour rated party wall halfway the building, this is not a true fire wall, therefore this is considered to be one building. my question is to comply with 250.58, to have a single grounding system, Can the bonding jumper that connects service #1 to service #2 be routed through the attic of the the building ? thanks, mj

2017 / 2014 NEC & Related Books and Study Guides
Joined: May 2002
Posts: 1,716
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Mj, there is nothing prohibiting running through the attic as far as the NEC is concerned, there could possibly be a local code though.

Just be sure to use a proper "through penetration assembly" (fire cauking) when going through the rated wall.

Roger

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Posts: 186
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mj Offline OP
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thanks Roger, I have a contractor that do not understand the purpose of 250.58 since the slap in already in, I was going to suggest routing the bonding jumper through the attic to create a single grounding electrode system.

Joined: Jun 2002
Posts: 186
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mj Offline OP
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need help guys.... any more details to support sec# 250.58, commom gronding electrode where there are multiple services on one building ? I have a board meeting soon, and I need to prove my case for requiring the bonding of electrodes for all services. thanks, mj

Joined: Jun 2002
Posts: 186
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mj Offline OP
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does any kwows how long this requirment has been required in the nec .... "common gronding electrode,Sec # 250.58 " I had one inspector stated that it was not required in the 1990 nec.


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