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Old 04-23-2017, 09:15 AM   #1
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Default Service Equipment Attached To Metal Siding

Just wondering how grounding, bonding and separation of ground and neutral apply to a situation like this: A 200 AMP service meter box is attached to the metal siding of a pole barn using unistrut channels and the neutral in the meter box is bonded to the meter box which in turn bonds it to the metal siding via the unistrut channel. The main 200 amp panel has the Ground and Neutral buses bonded and the grounding electrode conductor originates here and terminates in two grounding electrodes. Does the neutral from the service being bonded to the metal pole barn siding pose a potential problem?
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Old 04-23-2017, 09:32 AM   #2
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Nope, that is perfectly normal. Everything sounds good.
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Old 04-23-2017, 09:39 AM   #3
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There's not much you can do to correct it.
There probably will be return current between the metallic portions of the meter and panel.

I've build numerous services like this with no issues.

I wish the utilities would allow an isolated neutral in their can.
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Old 04-24-2017, 10:34 AM   #4
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You need to scrape some paint off the tin and attach a lug with a bonding jumper to the ground bus.

Then if the tin were to become energized it has a path to ground better than a human body.

That's a requirement here.

Done dozens of them.

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Old 04-24-2017, 11:54 AM   #5
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There's not much you can do to correct it.
There probably will be return current between the metallic portions of the meter and panel.

I've build numerous services like this with no issues.

I wish the utilities would allow an isolated neutral in their can.
One place I worked, they isolated the whole can with a plywood backboard.
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Old 04-24-2017, 11:58 AM   #6
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Originally Posted by Glock23gp View Post
You need to scrape some paint off the tin and attach a lug with a bonding jumper to the ground bus.

Then if the tin were to become energized it has a path to ground better than a human body.

That's a requirement here.

Done dozens of them.

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That is one of the dumbest things I have ever heard. Your inspectors need a kick in the nards.
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Old 04-24-2017, 12:00 PM   #7
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That is one of the dumbest things I have ever heard. Your inspectors need a kick in the nards.
I was thinking the same thing. Unistrut bolts to the siding is enough of a connection to not require any more nonsense.
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Old 04-24-2017, 12:22 PM   #8
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Not sure if it is relevant but our code says bond attachment can serve no other purpose but bonding, so that means no equipment fasteners can be used for bonding.
sort of like when home owners just bond a light fixture to the mounting strap and not continue it to the bond conductor

Last edited by electricguy; 04-24-2017 at 12:24 PM.
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Old 04-24-2017, 12:31 PM   #9
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One place I worked, they isolated the whole can with a plywood backboard.
Why? Was the riser & feeder nonmetallic as well?
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Old 04-24-2017, 12:35 PM   #10
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Why? Was the riser & feeder nonmetallic as well?
They wanted little or no current on all the grounding conductors. Yes, riser & feeder were nonmetallic.
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Old 04-24-2017, 12:44 PM   #11
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I see, so that backboard was used for the sole purpose of providing an insulator between the meter enclosure and metal building?
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Old 04-24-2017, 12:52 PM   #12
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I see, so that backboard was used for the sole purpose of providing an insulator between the meter enclosure and metal building?
To isolate the MDP which was fed by a genset. But yes sole purpose was for isolation.
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Old 04-24-2017, 07:39 PM   #13
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Just wondering how grounding, bonding and separation of ground and neutral apply to a situation like this: A 200 AMP service meter box is attached to the metal siding of a pole barn using unistrut channels and the neutral in the meter box is bonded to the meter box which in turn bonds it to the metal siding via the unistrut channel. The main 200 amp panel has the Ground and Neutral buses bonded and the grounding electrode conductor originates here and terminates in two grounding electrodes. Does the neutral from the service being bonded to the metal pole barn siding pose a potential problem?

Does said pole barn share power or communication lines with any other proximal structure?

~CS~
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Old 04-25-2017, 10:49 AM   #14
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According to 250.116 informational note "Where extensive metal in or on buildings may become energized and is subject to personal contact, adequate bonding and grounding will provide additional safety."

Because the above statement doesn't contain the words shall or shall not and is an informational note I would say its up to the AHJ. That being said a metal enclosure mounted to metal strut on the side of metal building is considered bonded around here.
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Old 04-27-2017, 05:43 PM   #15
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Does said pole barn share power or communication lines with any other proximal structure?

~CS~

No it does not.
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