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Electrical Discussion of preventative/corrective maintenance and other technical issues regarding your coach's electrical system.

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  #1  
Old 07-28-2008
gcyeaw's Avatar
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Gardner
 
Join Date: Dec 2007
Location: Ridgewood
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Default Electrical ground and neutral

I know that ground and neutral are NOT tied together in the RV breaker panel. This is a safety issue and I understand the reasoning. It prevents a double failure (ground and neutral) from making the coach body electricaly hot.

That stated, NEC code requires the Xantrex inverter (and all others as well) to tie the inverter OUTPUT ground and neutral together when the input AC power is OFF. Once again, this is a safety feature. If there is no shore power is assumed the ground and neutral are not tied through the supply, so the inverter assumes that responsability.

Now to the generator, from the above I would suspect that the generator ground and neutral should be tied on the generator side of the transfer switch. Is that correct?
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Old 07-29-2008
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John Wyatt – Administrator/Moderator
 
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Hi Gardner,

First let me say I’m not an RV electrical code expert so you or anyone else reading this should verify the following with someone who is.

I think the short answer is yes the generator ground and neutral are tied together on the generator side of the transfer switch.

Whatever source is supplying the AC power to the Coach is supposed to have it’s neutral conductor tied to ground at the SOURCE of the power but keep in mind that the Coach neutral can only be allowed to be connected to ground in one place at any one time.

As you pointed out the Shore neutral to ground connection is supposed to be taken care of on Shore (it’s Source) and not on the Coach.

Since the Generator and the Inverter are “Sources” those neutral to ground connections have to be made on the Coach and must be connected to the Coach neutral only at the proper times.

While supplying AC to the Coach from Shore the Coach neutral can not be allowed to still be connected to ground at the generator or the Inverter.

If you are supplying AC to the Coach from the Generator, the Coach neutral can not be allowed to still be connected to ground at the Inverter or through the cord to the Shore ground.

If you are supplying AC to the Coach from the Inverter, the Coach neutral can not be allowed to still be connected to ground at the Generator or through the cord to the shore ground.
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  #3  
Old 07-30-2008
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John,
Thanks for your input. I figured the generator circuit should provide the tie between neutral and ground, but it is good to have a second opinion.
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