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chuck172 06-30-2011 01:08 AM

generator transfer switch
I'm installing a generator 6 circut manual transfer switch. Looks like I need to either splice the circuts in the load center (circut breaker box) and bring the wires out to the transfer switch, or I can pull the wires out of the load center and add junction boxes and then route the circuts to the new generator transfer switch.
I have the room in the load center. I'd prefer this method. Is it up to code?

chuck172 06-30-2011 07:28 AM

Any answers? I'd like to get started on this.

AllanJ 06-30-2011 07:39 AM

Doing all the splicing in the load center is topologically equal to using the load center as a pass through. This is not permitted in some local cities' code.

With that many (six) circuits, the load center would be much cleaner if you withdraw the circuit cables in question from the load center and use a separate junction box.

chuck172 06-30-2011 09:04 AM

Can I fit all 6 circuit splices in one junction box?
What size box should I get?

AllanJ 06-30-2011 11:39 AM

Get a 59 cubic inch box for 12 gauge wiring (52 ci for all 14 gauge).

Be sure there are enough holes for the various cables going in. Usually one hole (with appropriate clamp) can admit two Romex cables.

Connect each circuit neutral only to the neutral that accompanies the corresponding hot wire going to a switch.

Connect all ground wires together in the junction box. You can group the ground wires into bundles with jumper wires (pigtails) connecting the bundles.

brric 06-30-2011 12:15 PM

Provided there is adequate space, splicing in the load center is acceptable in most cases. Generac transfer switches are manufactured that way.

chuck172 06-30-2011 01:39 PM

Can two romex 12/3 wires go through the same knockout and both share the same clamp?

brric 06-30-2011 01:48 PM

If the clamp is listed for two cables, yes. If you are considering shared neutrals make sure the tranfer switch is compatible for that configuration.

Jim Port 06-30-2011 03:34 PM

Typically the NM clamps are for 2 flat cables like 14-2, but only one 3 wire like 14-3. Check the packaging.

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