4 wire feeder

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iaov

iaov

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Rhinelander WI
Don't have my book with me at the moment and need to know what is the Code Article that requires a 4 wire feed to a sub panel. Thanx all!
 
I don't know that there is a requirement of a 4 wire feeder to a sub-panel :D. I approve many sub-panels with a 3 wire feeder.
 
Single phase, Three wire with ground. If using a non-approved raceway for grounding the feeders would be required to be four conductors, two hots, grounded conductor, and a grounding conductor per 250.24(A)(5).
 
Mvillines said:
Single phase, Three wire with ground. If using a non-approved raceway for grounding the feeders would be required to be four conductors, two hots, grounded conductor, and a grounding conductor per 250.24(A)(5).
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Single phase 120 volt panel would be a two wire with ground feeder. :wink:

Roger
 
agree.
Now, what if there is no neutral load (such as a 240 volt HVAC sub-panel--no neutral) ?
The OP didn't specify 3 phase 4 wire with ground, he just said sub-panel :smile:
 
This triggered a question for me. In the pre-'08-NEC world, could one run a 120v circuit to a separate building, and use only two wires, by re-grounding the grounded conductor?
 
LarryFine said:
This triggered a question for me. In the pre-'08-NEC world, could one run a 120v circuit to a separate building, and use only two wires, by re-grounding the grounded conductor?
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if it met the other requirements of 250.32, yes.
 
augie47 said:
agree.
Now, what if there is no neutral load (such as a 240 volt HVAC sub-panel--no neutral) ?
The OP didn't specify 3 phase 4 wire with ground, he just said sub-panel :smile:
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True, but don't forget to installed the bonding screw to bond the cabinet. I see where some electricians will land the EGC on the insulated terninal block and forget they are required to install the bonding screw using this condition (no neutral loads).
 
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