Bonding metal siding and counter tops

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wyboy

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Is outside corrugated metal siding on the outside of a wood frame dwelling required to be bonded? How about stainless kitchen counter tops? Duct work?
 
No to all three, unless the AHJ determines those objects are likely to become energized.

They may cite section 250.104 of the NEC.
 
Most of the time duct work would be bonded due to the fact that it is attached directly to a furnace that would be bonded. But in a case where the duct work is isolated from the furnace, you would not be required to bond the ductwork unless it was likely to become energized.

Chris
 
Chris hits on an interesting point. On many occasions, creative building techniques can prevent or eliminate these concerns. It is usually a lot easier for the framing crew, a/c crew, ect, to make slight modifications to their materials / installation methods than it is for the electrical contractor to follow behind each trade installing bonding jumpers all over the place...
 
wyboy said:
Is outside corrugated metal siding on the outside of a wood frame dwelling required to be bonded? How about stainless kitchen counter tops? Duct work?
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I'm not sure what code you're using where you are located, but I do know that E3509.1 in our New York State Residential Code says this: " 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."
Our RCNYS is based on the IRC, so yours may be the same. Check with your building official. :smile:
 
There is no way to bond aluminum siding unless you plan on bolting a lug on each and every section.

IMO a better plan is to make sure anything that could energize it is properly bonded.
 
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