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Old 05-06-2019, 01:51 PM   #1
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Wire Size?

What size wire should I run for 110v lights and fridge, TV.? Does my wire gauge change due to length of run on my DC runs? What size wire for LED lighting?
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Old 05-06-2019, 04:16 PM   #2
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For 120v runs I would stick with 12 gauge. This stuff is the bomb: https://www.amazon.com/Common-Sense-.../dp/B07323J6VR

for DC I would use a wire size calculator: https://www.wirebarn.com/Wire-Calculator-_ep_41.html
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Old 05-06-2019, 06:00 PM   #3
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Originally Posted by PNW_Steve View Post
For 120v runs I would stick with 12 gauge. This stuff is the bomb: https://www.amazon.com/Common-Sense-.../dp/B07323J6VR

for DC I would use a wire size calculator: https://www.wirebarn.com/Wire-Calculator-_ep_41.html
Would I need a 12/3 or would a 12/2 work?
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Old 05-06-2019, 06:05 PM   #4
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12/2 has two conductors. Hot and Neutral.

12/3 has three conductors. Hot, Neutral and Ground.

In our application, allways 12/3.
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Old 05-08-2019, 05:55 PM   #5
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FML. I hate our local Home Depot, the last few years everything has gone downhill there, never enough floor help and the selection gets slimmer every week. I seldom leave the place with everything if not anything I went there for. We need the competition of a Lowes here. So this time I go to get 1/2" ball valves with a red handle, used them all time when I was in construction, blue handle for cold, red handle for hot. HD only carries the 1/2" in blue. Okay, not surprising they don't have what I need. I head to the electrical dept. to find a 100' roll of 12/3. I can't find it, grab the floor guy who says I know we have it, I just pulled one earlier for a customer. Go to the shelf, nothing. Go to an end cap and find all lengths except 100'. He says we have 250' rolls. I say way more than I need at that price. So I look back at the shelf where the 100'ers should be and notice it is $107($1.07/lf). I go back and check the 250' roll and it's $136, WTF. $107 for 100' and then $29 for another 150'($.19/lf . Well that was a no brainer at that point to get the big roll. Ran into the same thing at the grocery store yesterday.
Needed chicken wings. I see a 5lb bag of legs, regularly priced at $4.99, 5lb bag of thighs, regularly priced at $4.99. Then there were the 5lb bags of wings for $15.99 on sale for $13.99, WTF. I went home with legs.
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Old 05-08-2019, 08:00 PM   #6
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Quote:
Originally Posted by PNW_Steve View Post
12/2 has two conductors. Hot and Neutral.

12/3 has three conductors. Hot, Neutral and Ground.

In our application, allways 12/3.
12/2 has 2 insulated conductors, Hot and Neutral, plus a bare ground.

12/3 has 3 insulated conductors, plus a bare ground. One conductor is black, one is white, one is red. and one is bare (no insulation). Except for a switch loop, the black and red are used for hot wires and the white is used for the neutral. The bare wire is always a ground

12/2 is what you need for most applications, other than switch loops.
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Old 05-08-2019, 08:19 PM   #7
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12/2 is what I thought I needed, I can get it for half the price of 12/3.
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Old 05-08-2019, 09:30 PM   #8
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Quote:
Originally Posted by PNW_Steve View Post
12/2 has two conductors. Hot and Neutral.

12/3 has three conductors. Hot, Neutral and Ground.

In our application, allways 12/3.


Depending on what wire type 12/2 can mean hot neutral ground. It does for romex. But for SOOW you need 12/3 to get the same thing.
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Old 05-08-2019, 09:41 PM   #9
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I can get heavy duty exterior 12/3 extension cord wire much cheaper than Romex. Which is better for this application?
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Old 05-08-2019, 10:22 PM   #10
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Hi o1marc, this is my first post. Master electrician for 22 years, 32 years experience.

Outdoor grade extension cable is what I use for mobile work.
PNW_Steve is describing rubber jacketed cable, aka extension cord.

Willie McCoy is describing NM cable, aka Romex

Romex (brand name), or NM cable, as it is generically known, has solid conductors, and may tend to work-harden where subject to movement in mobile applications. Rubber jacketed cable will have stranded conductors that may better serve you in a mobile application. In either case, proper bushing of holes where cables pass through metallic surfaces is essential, as is adequate support of cabling.
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