Bonding of metal siding on a building

Status
Not open for further replies.
pete m.

pete m.

Senior Member
Location
Ohio
I know this question has probably came up at least eleventeen hundred times.

I am reviewing a set of drawings for an RV/Boat storage facility which is going to built using "pole barn" type construction and will have metal siding installed.

The engineer has a note on the drawings that states "Building metal veneer to be grounded per NEC 250.116 (fpn). Use copper clad steel rod 3/4" diameter and 10'-0" long spaced at 100'-0" maximum - use #1/0 copper wire."

I know that if this method is used that all these ground rods will have to be bonded back to the grounding electrode system for the service....... the question I have is what is the proper method to bond this veneer? Will a separate connection need to be made to each panel due to the panels only overlapping and fastened with screws or nails? What about all the corner mouldings, etc.......?

Pete
 
I'm not sure how the engineers specs will effect you that is contractual but the NEC does address structual metal parts in section 250.104(C).


Hope it helps

Charlie
 
Thanks for the reply Charlie. These metal panels I don't think could be considered structural.... forming a frame of the building. They are just a "skin" for the wood framing underneath.

I know this subject has came up before on this forum but it was in the context of an inspector requiring the siding to be bonded. Now there is an engineer specifying that it be done. I am just curious to see opinion on whether or not a connection would be required to each individual piece of siding to comply with 250.4(a)(4).
 
There is no way to bond the siding without bonding each and every section and you must remove the protective coating to make the bond connection. The key to 250.4(A)(4) is the words "likely to be energized". The only panels that are likely to be energized are those that have electrical equiment in them. A bond to the equipment EGC would serve the purpose.
Don
 
Last edited:
Based on the OP, it reads like a typical lightning protection system specification for this type of structure other than the part where he referenced a FPN in the NEC...
 
Status
Not open for further replies.
Top