Which wire used?

I have a 1948 Scotty camper that I am rewiring. I went to lowes to get the wire. The boxes were 14/2 nm-b indoor wire with ground and another wire said 14/3 nm-b indoor wire with ground. What does the difference mean between them?
Thanks
Connor

 

Both may only be used in normally dry locations. Both contain 14-gauge solid copper wiring. Both use the same type of 90-degree C insulation.

The only difference is the number of wires. 14/2 has two insulated conductors (black and white) and a bare grounding wire. 14/3 has three insulated conductors (black, white and red) and a bare grounding wire.

 

1 wire.

Actually, the 14-2 has one black wire for hot, one white for neutral and one ground, bare. The 14-3 has another wire, red.

You use 14-2 for just about all circuits, outlets, switches, lighting, etc.

The 14-3 is used for 3-way switched circuits, and shared-neutral circuits.

There is also 14-4 for use in wiring arc-fault circuits.

 

Thanks so much.. that makes since.

 

I've never heard of using 14-4 on arc-fault circuits...
explain it to me if you will.
I am aware that there is 14-4, and it is a rarity, just never heard of using for that purpose, I assumed that AFCI's always went in just like GFCI breakers. Is there another product or application you know of?

gj

 

14/4 has two hot wires and two grounded conductors (aka neutrals). It's not specifically for AFCI circuits. However, because there are no AFCI breakers for multiwire circuits, AFCI cannot be used on a multiwire circuit. This caused the marketing department at Southwire to speculate that 14/4 could be used where a 14/3 would have previously been used for a multiwire circuit, but where AFCI is now required.

You can use 14/4 anywhere you feel like it, AFCI or not. And you can certainly wire AFCI without it. Southwire just figured that AFCI would create a demand for 14/4. Not sure how it's selling so far.

 

I have seen it in person, did Home Depot sell it? Lowe's has changed brands several times to and from Cerro copper, although I doubt it was lowe's.
I wish General Cable had not sold the Romex name to Southwire, they invented it afterall. I have always liked General Cable. They changed the name to BICC General for some reason.

gj