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Flickit · Apr 12, 2005, 07:37 AM

Wondered how the NEC feels about using parallel feeders instead of footing the cost for more expensive larger sized wire? Application is UF-B from house to detached garage. Want to use 2 sets 12-3, WG instead of paying for 10-3 WG (or 8-3 WG). Am not interested in having an inspection.

labman · Apr 12, 2005, 08:59 AM

I can't give you what code says. I do know it is quite common to use multiple wires to carry large industrial 3 phase loads. I have seen things like 3 conduits each carrying three 500 MCM singles. They are quite common in factories.

Flickit · Apr 12, 2005, 09:35 AM

Originally Posted by labman

I can't give you what code says. I do know it is quite common to use multiple wires to carry large industrial 3 phase loads. I have seen things like 3 conduits each carrying three 500 MCM singles. They are quite common in factories.

... it would be a better bet to place them in PVC conduit so if they ever are found to violate code, they can be replaced easier. You agree, Labman?

labman · Apr 12, 2005, 11:54 AM

Certainly wouldn't hurt. Do you already have a big coil of 12-2? Again you buy 2 lengths of it plus the conduit, surely one length of 10-2 would be cheaper. Also if you run conduit, you could run singles rather than cable. Stranded singles pull easier than solid cable.

tkrussell · Apr 13, 2005, 01:00 PM

Per the current edition of the National Electric Code:

"Section 310.4 Conductors in Parallel.
Aluminum, copper-clad aluminum, or copper conductors of size 1/0 AWG and larger, comprising each phase, neutral, or grounded circuit conductor, shall be permitted to be connected in parallel (electrically joined at both ends to form a single conductor)."

Should you install electric wiring without proper licenses or permits, and loss of life and/or property occurs due to improper installation, you insurance will not cover your losses.

Something to consider.. save a few bucks now, and pay large bucks later.

Flickit · Apr 13, 2005, 07:53 PM

Originally Posted by tkrussell

Per the current edition of the National Electric Code:

"Section 310.4 Conductors in Parallel.
Aluminum, copper-clad aluminum, or copper conductors of size 1/0 AWG and larger, comprising each phase, neutral, or grounded circuit conductor, shall be permitted to be connected in parallel (electrically joined at both ends to form a single conductor)."

Should you install electric wiring without proper licenses or permits, and loss of life and/or property occurs due to improper installation, you insurance will not cover your losses.

Something to consider..save a few bucks now, and pay large bucks later.

... info and the reminder of just how dangerous electricity is!