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Old 12-12-2006, 07:52 PM   #1
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12v wire size

I'm sure I stink at this search function, but couldn't find much on 12V wire size. I did see where 18 is the minimum for an RV, but what does everyone use? 14?
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Old 12-12-2006, 08:02 PM   #2
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Depends on what it connects. The more amps the LOWER the wire gauge you need, the longer the run (how far from the box) the Lower the wire gauge. Lower is thicker and lets more juice thru. Use marine stranded wire. Costs more but works alot easier. You can always use a heavier wire than you need. What are you doing?
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Old 12-13-2006, 09:10 AM   #3
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Rewiring the whole thing from scratch. 12v will only be for lights, fantastic fans and plugs, I'm not putting in a three way fridge or furnace. Biggest thing on a plug will be an LCD TV.

Any thoughts on where to get the Marine stranded wire?
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Old 12-13-2006, 10:07 AM   #4
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Quote:
Originally Posted by dmaiden
Rewiring the whole thing from scratch. 12v will only be for lights, fantastic fans and plugs, I'm not putting in a three way fridge or furnace. Biggest thing on a plug will be an LCD TV.

Any thoughts on where to get the Marine stranded wire?

We buy our wire from West Marine. They have a store right down the street from my office. Also by all my replacement stainless screws from them.
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Old 12-13-2006, 10:19 AM   #5
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Thanks Rick. I think we have one near us as well.
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Old 12-13-2006, 12:03 PM   #6
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Compare these prices to West Marine's.

Also see John HD's posts on voltage drop, besides ampacity. Here's a quick little calculator.
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Old 12-13-2006, 12:05 PM   #7
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Check out Waytek Wire : Electrical Wiring Supplies & Industrial Products for supplies.
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Old 12-13-2006, 12:40 PM   #8
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Thanks. Looks like 14 would be adequate for what I'm doing. Great prices at that bestboatwire place too!
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