Extending circuits

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08-11-17, 09:12 AM

gagecalman

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Extending circuits

Hello and happy Friday.

I need to extend some circuits about 3' to go into a sub panel. Three are BX with the bonding wire and five are Romex.

What is the best way to do this?

Can I use a large box or should I use several smaller ones?

Can the box(s) and all of the grounds be connected together and grounded by one larger wire?

Thanks in advance for the help.

Jim

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08-11-17, 09:47 AM

ray2047

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You can use one box. It must be metal because of the Bx.

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Can the box(s) and all of the grounds be connected together and grounded by one larger wire?

All neutrals must be combined. You only need one ground wire for all. Its size is based on the highest amp circuit. Metal boxes must be connected to the ground wire. Neutrals can not be combined.

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08-11-17, 11:00 AM

gagecalman

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Hi Ray,

Thanks for the quick reply.

I assume you meant all grounds must be combined in the first sentence.

Based on #14 and #12 wires can you recomend a box size?

Can a ground bar be used in the box to attach all of the grounds and a #12 wire run from it to the sub?

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08-11-17, 11:34 AM

Zorfdt

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post removed, redundant.....

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08-11-17, 11:42 AM

ray2047

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You will need to do a box fill calculation.
https://www.constructionmonkey.com/c...trical/boxfill

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Can a ground bar be used in the box to attach all of the grounds and a #12 wire run from it to the sub?

Yes.

Last edited by ray2047; 08-11-17 at 01:42 PM.

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08-13-17, 03:30 PM

gagecalman

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If the junction box and sub panel were connected with a piece of conduit can solid wire from Romex be used for the hots and neutrals?

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08-13-17, 04:54 PM

ray2047

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Quote:

can solid wire from Romex be used for the hots and neutrals?

Technically no because the conductors in NM-b are not marked. You can use solid THHN/THWN though. A ground wire is optional if you use metal conduit. you could just pigtail the grounds to the metal junction box.

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08-14-17, 07:15 AM

gagecalman

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Thanks for the great info!

Jim

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