Grounding metal roof coverings

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terryb

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Can anyone tell me the NEC reference regarding the grounding / and bonding of metal roof coverings??
Thanks.
 
bphgravity said:
Section 250.104(C) of the NEC, maybe. Section 250.4(A)(4) & (5). Section 250.96.
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I am very interested in understanding your response.
could you please explain how these sections apply to metal roofs ? I have never interpreted "likely to become energized" to equate with "likely to be struck by lightning". Does your jurisdiction interpret these to mean the same thing ?

(that is not to say that a roof might not be subject to this case, but consider the case of a metal roof with no wiring or conduit attached directly to it)
 
nakulak said:
I have never interpreted "likely to become energized" to equate with "likely to be struck by lightning". Does your jurisdiction interpret these to mean the same thing ?
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Where do you find the term "likely to be struck by lightning"? And if it is, is it required to be grounded?
 
iwire said:
In my opinion there is no section in the NEC that ever requires the metal roof on a dwelling to be bonded.
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In NY State, we have in our Residential code a section E3509.1 that states:....."Where electrical equipment is mounted on conductive roofing or siding, it shall be bonded to form an electrically conductive path that ensures electrical continuity and the capacity to conduct safely any current likely to be imposed on it." :smile: (Granted, of course, that's not the NEC)
 
"likely to be struck by lightning" was the only reasoning I could see for having lightning protection, I did not see the term. "likely to become energized" was, I assume, the reason that those code sections were quoted ?

(unless I am missing something ?? I was unaware that metal roofs had bonding requirements according to NEC)
 
nakulak said:
"likely to be struck by lightning" was the only reasoning I could see for having lightning protection, I did not see the term. "likely to become energized" was, I assume, the reason that those code sections were quoted ?

(unless I am missing something ?? I was unaware that metal roofs had bonding requirements according to NEC)
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I'm unaware of any requirement either however I would be interested to know if any one thinks it would be a good idea. Lightning scares the hell out of me in general and I recently moved into a house with a metal roof and I wonder ....
 
It seems to me that if there is electrical equipment mounted on a conductive roof or siding, such as a roof de-icer, etc., that the equipment grounding conductor of the circuit "likely to energize" the roof or siding would be sufficient. :smile:
 
wbalsam1 said:
It seems to me that if there is electrical equipment mounted on a conductive roof or siding, such as a roof de-icer, etc., that the equipment grounding conductor of the circuit "likely to energize" the roof or siding would be sufficient. :smile:
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i would agree w/ that.
 
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