Feeder Question

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Strahan

Strahan

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Location
Watsontown, PA
Customer wants to install a 100amp sub panel located in the same building which makes install a feeder. OCPD will be provided at the main panel. I know the rules for an install to a detached building but not real clear on install in same building. Looking to run SE 3 conductor with ground from main panel to sub. Do I need to keep my neutrals and grounds separated in the sub panel? Thanks
 
250.6 is the first place.

If every thing is proper you can put your volt meter on the white wire and any bare metal, this includes a copper equipment grounding conductor and read 0 volts, but neutral current is still current...... electrons are moving from the source to the light bulb and back to the source...... The goal is to keep all those electrons moving on the white and black wires and off any bare metal.
 
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One basic reference is 250.24(A)(5) which requires that grounded and equipment grounding conductors not be connected on the load side of the service disconnecting means, so any feeder supplied panel would require a separate neutral & equipment ground.

You mentioning using SE cable. Is this a residential facility ?
 
augie47 said:
One basic reference is 250.24(A)(5) which requires that grounded and equipment grounding conductors not be connected on the load side of the service disconnecting means, so any feeder supplied panel would require a separate neutral & equipment ground.

You mentioning using SE cable. Is this a residential facility ?
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Sorry took so long to get back. Yes this is a residential house.
 
Strahan said:
Sorry took so long to get back. Yes this is a residential house.
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If your grounds and neutral were tied together with a 4 wire feeder then you would have a parallel path and there would be no need for a 4 wire cable. As stated the equipment grounding conductor and the grounded conductor must be separated just as it would be at a separate structure.
 
Dennis Alwon said:
If your grounds and neutral were tied together with a 4 wire feeder then you would have a parallel path and there would be no need for a 4 wire cable. As stated the equipment grounding conductor and the grounded conductor must be separated just as it would be at a separate structure.
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Ok Thanks Dennis. Makes sense once I take time and think. With that being said can I run 3 wire SE cable? 2 Hots and neutral and not the grounding conductor? I think this code has been changed just need some clarification. Thank You
 
Strahan said:
Ok Thanks Dennis. Makes sense once I take time and think. With that being said can I run 3 wire SE cable? 2 Hots and neutral and not the grounding conductor? I think this code has been changed just need some clarification. Thank You
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No..... If this is a feeder you need ser-- 4 wire. You need to connect the neutral and ground at the same point in the service panel but at the other end they get separated. That will not be a parallel path in that case.
 
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