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Old 01-21-2013, 10:52 AM   #1
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Generator sub-panel


Main panel - (BR2020BC100)
Generator transfer panel -switched neutral - (Reliance XRC0603C)
Both connected via STEEL 8" nipple.
I understand that the neutral and earthground are connected together in the main panel as well as to the main panel case itself.
I understand that the neutral and earth ground are to be isolated in the generator (sub) panel.
This set up to be used with a bonded neutral generator.
The problem I am having is with the two panels being connected by a STEEL nipple-doesn't the steel nipple make both panels one in the same electrically? Thus making the generator sub panel neutral and earth ground the same rather than isolated?
I could understand the above panels being connected by Romex cable and loosing the steel nipple? This would make each panel seperate and the sub panel neutral and earth ground isolated.
Would appreciate some insight on this .
THANKS

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Old 01-21-2013, 11:22 AM   #2
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Generator sub-panel


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Old 01-21-2013, 11:27 AM   #3
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Generator sub-panel


The ground wire connects the panels electrically. The nipple offers a path for the circuits to be connected to the transfer panel. Didn't you get instructions with the transfer panel?
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Old 01-21-2013, 12:54 PM   #4
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Generator sub-panel


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The problem I am having is with the two panels being connected by a STEEL nipple-doesn't the steel nipple make both panels one in the same electrically? Thus making the generator sub panel neutral and earth ground the same rather than isolated?
No. The neutral bus in the subpanel is insulated (Isolated) from the metal of the panel. Only neutrals are terminated on this bus. There should be a separate ground bus that has contact with the panel.

When operating on the generator, the neutral from the main panel is lifted, giving you one bond between neutral and ground at the generator.
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Old 01-21-2013, 01:09 PM   #5
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Generator sub-panel


Is the idea to isolate the neutral in the sub panel only. as the earthground in the sub panel is connected electrically to the main panel- neutral and earth ground?
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Old 01-21-2013, 01:50 PM   #6
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Generator sub-panel


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Originally Posted by wmmurphy8844 View Post
Is the idea to isolate the neutral in the sub panel only. as the earthground in the sub panel is connected electrically to the main panel- neutral and earth ground?
Neutral is considered the "return" conductor. Should you connect ground and neutral in the sub then return current can flow on the ground or the neutral back to the main panel. This is the problem that you want to avoid as the current should only flow on the neutral back to the main.
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Old 01-21-2013, 02:06 PM   #7
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Generator sub-panel


The circuits in the main panel are not eligible to receive generator power, so their neutrals bonded to ground in the main panel do not matter.

That is, there will be no generator current going up to the main panel and its branch circutis so there can be no return current flowing through the equipment grounding conductors which include the metal nipple between the panels, back to the subpanel and to the generator.

In the subpanel, neutrals and ground are not bonded (should not be bonded) so the bond inside the generator is the one and only neutral to ground bond which works perfectly.

If the main panel and subpanel were connected using a Romex cable then that cable must have a separate (usually bare) EGC that is connected to the ground bus bars in both panels.

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Last edited by AllanJ; 01-21-2013 at 02:15 PM.
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