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Old 06-12-2014, 12:17 PM   #1
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GEC Touching Metal Building


We just built a wood framed building with metal siding and roof. The GEC runs out the bottom of the panel, down the stud bay, and out through a hole in the metal siding down at the bottom plate. Any problem with the GEC touching the metal of the building?

PS- I posted exact same question on another forum in case you come across it over there.

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Old 06-12-2014, 12:47 PM   #2
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GEC Touching Metal Building


The metal siding should be bonded to the GEC.

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Old 06-12-2014, 01:06 PM   #3
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GEC Touching Metal Building


It's metal siding.
How will each piece of siding "bond" to the next piece.

It is siding not structural steal.

No "bonding" necessary. But couldn't hurt if you "tried". IMO.
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Old 06-12-2014, 09:12 PM   #4
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GEC Touching Metal Building


Quote:
Originally Posted by Jim Port View Post
The metal siding should be bonded to the GEC.
Not required...
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Old 06-12-2014, 09:22 PM   #5
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GEC Touching Metal Building


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It's metal siding.
How will each piece of siding "bond" to the next piece.

It is siding not structural steal.

No "bonding" necessary. But couldn't hurt if you "tried". IMO.
I agree it's not necessary, but, watch for the 2017 code or maybe the 2021. Remember, the water bond rule....
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Old 06-12-2014, 09:48 PM   #6
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GEC Touching Metal Building


I'd bond it to the egc, what the heck I've seen chain link fence get energized why not metal siding.....
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Old 06-12-2014, 09:52 PM   #7
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GEC Touching Metal Building


Quote:
Originally Posted by ritelec View Post
It's metal siding.
How will each piece of siding "bond" to the next piece.

It is siding not structural steal.

No "bonding" necessary. But couldn't hurt if you "tried". IMO.
I would think the siding is fastened together with screws/mechanical connection of some sort.
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Old 06-12-2014, 10:20 PM   #8
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GEC Touching Metal Building


OK.... So this thread, disregarding code for a moment. made me wonder about a theoretical based question......

Do not we put a ground rod on a home to somewhat attract a lightening charge away from the home and to a better ground source ...the ground rod system.

So, if we ground steel siding with a #6 ground, are we not attracting lightening to an undersized grounding system.

I'm sure this is dumb, help straighten out my thinking/understanding.

TIA

(Although it is somewhat theoretical, the question does go to whether, and whether not, it will or should be future code.)
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Old 06-12-2014, 11:03 PM   #9
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GEC Touching Metal Building


Well if you really want to get technical if the building has its on service and meter socket attached to the outside its already bonded to the electrical service/grounding through the metal siding.
They make you bond the rebar in garages when installing an electrical service,personally I see more potential in steel siding becoming energized than the rebar in the floor/walls anyway.
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Old 06-12-2014, 11:23 PM   #10
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Quote:
Originally Posted by plummen View Post
Well if you really want to get technical if the building has its on service and meter socket attached to the outside its already bonded to the electrical service/grounding through the metal siding.
They make you bond the rebar in garages when installing an electrical service,personally I see more potential in steel siding becoming energized than the rebar in the floor/walls anyway.
Well... Isn't the UFER grounding (rebar in foundation) a grounding component of the GEC and not done as an issue of becoming energized as in the bonding (equalpotential) function of the GEC.... if that made sense.

I guess I'm saying the run to the rebar (UFER) is to establish a ground, and any bonding to the steel sideing would be to establish equal potential if the siding became energized.... sorta two differnt functions/objectives.

But, a pretty good point.... seems if we bond pipes and Jacussi motors to make sure they are at ground potential, does seem we outta ground steel siding which seems it could get energised also.

Not that I wanna go there.... just discussion
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Old 06-13-2014, 12:41 AM   #11
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GEC Touching Metal Building


I see no reason to include metal siding on a wood frame in the bonding of the grounding electrode system. However I would entertain an argument about the metal siding being "likely to be energized" and should be bonded to the EGC. Even if energized ... and I'll bet there is someplace out there that has metal siding energized ... it would be difficult to provide a good enough bond via the fasteners on each panel to clear a fault. It would be one thing to read voltage on a panel but the fault would likely not clear if a single panel is bonded to the egc unless that is the origin of the fault. You likely would have to bond each panel. Seems like there was an FPN about metal siding I'll see if I can come up with it assuming my memory is correct ...

Mike Holt forum probably has a discussion about metal siding, they hash over just about everything imaginable ....
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Old 06-13-2014, 05:54 AM   #12
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GEC Touching Metal Building


Quote:
Originally Posted by Jim Port View Post
The metal siding should be bonded to the GEC.
If it is aluminum siding bonding the siding is not only impractical but useless as the aluminum is coated and any exposed joints will oxidize. If it is overlapping steel it is coated as well and one would need to bond all separate pieces.
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Old 06-13-2014, 06:18 AM   #13
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GEC Touching Metal Building


Lets not forget that bonding metal objects is a good way to energize items that should never be energized, if a utility company should lose a neutral conductor, everything bonded will become energized!
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Old 06-13-2014, 06:50 AM   #14
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GEC Touching Metal Building


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Lets not forget that bonding metal objects is a good way to energize items that should never be energized, if a utility company should lose a neutral conductor, everything bonded will become energized!
Ground rods will save the day.
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Old 06-13-2014, 07:03 AM   #15
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GEC Touching Metal Building


Quote:
Originally Posted by plummen View Post
Well if you really want to get technical if the building has its on service and meter socket attached to the outside its already bonded to the electrical service/grounding through the metal siding.
They make you bond the rebar in garages when installing an electrical service,personally I see more potential in steel siding becoming energized than the rebar in the floor/walls anyway.
Yep it has it's own service and meter.

There will be a little current on the GEC going to the ground rod and to the utility pole so I was thinking maybe current would be all over the metal siding, through the slab, back to utility pole. Didn't want to have any problems.

But you're right. The meter is mounted to the metal siding already so I can't see there being any extra issues with the GEC touching the metal siding.

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