Bonding and Grounding

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Dennis Lawrence

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Here is the situation, there are 50 living trailers the only thing in the trailers are AC unit's and lights and outlet's 230v to ground.
The way they are wired at present is an MDP with 250amp breakers feeds the sub-panels which in turn feed's a 60amp sub-panel in each trailer, they are in rows of 6. The feeder from the power panel to the trailer sub-panel is a 4wire armored cable with three hot's and a neutral conductor they are using the armor for the ground
and then they set one ground rod for the row of trailer's and then daisy chained the rest of the trailers with a 2/0 copper bonding jumper. The neutral and the ground are not bonded in the trailer panel can someone tell me if this is legal or correct by the NEC. HELP
 
Re: Bonding and Grounding

I am not completely sure about using one ground rod for six trailers. It has been the subject of some debate, I believe.

But the rest sounds OK. I presume, though you did not say so, that the neutral and ground are bonded at the MDP. The N-G bond should be there, and there should not be an N-G bond at the individual trailer panels.

Just out of curiosity, since you are a QA/QC person, may I ask what your role is for this installation?
 
Re: Bonding and Grounding

I'm trying to imagine a 3-phase 230v-to-ground installation in the U.S.
 
Re: Bonding and Grounding

Originally posted by LarryFine:
I'm trying to imagine a 3-phase 230v-to-ground installation in the U.S.
Click to expand...
hmmm corner ground delta???
dont plug your computer into that outlet.
 
Re: Bonding and Grounding

It doesn't make any sense. The "230 Volt to ground" statement must be an error, because it just doesn't jive.

Corner Grounded Delta: too many conductors.

Overseas single-phase 240 to ground: too many conductors (unless the 4-wire is two parallel conductors in each cable, which is doubtful).

Here is the situation, there are 50 living trailers the only thing in the trailers are AC unit's and lights and outlet's 230v to ground.
Click to expand...
What are "living trailers"? Dwelling units?

Where in the world are you, Dennis? :D
 
Re: Bonding and Grounding

Dennis, the OP sent a PM saying he is in a camp in iraq.

The base where I do alot of work as a company that provides electric power for these types of installations. I have had the oppertunity to talk to some of their electricians. A great learning experience, but I am not sure that what they do is governed by the NEC.

From what I can gather they have thier own set of rules, simililar to but not 100 per cent/ per the nec.
 
Re: Bonding and Grounding

He sent me the same message.

I'd say it sounds compliant, so long as any metallic water piping supplying the trailers is bonded.

I'd like to hear more (publicly) about the system, and what it is. I still can't visualize the installation.

Hats off to you, Dennis, be safe. :)
 
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