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Old 02-03-2010, 12:54 PM
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oldguy,,,
LOL,
you are more correct AC versus DC flow ,,,

"but" stores frown at cutting off 1 foot to weigh it in the store for actual copper mass density per foot to compare one wire to the next...

because a starter can pull 300+ amps,,,400 if hot or worn etc,,,you want surface and core flow capable...

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Old 02-03-2010, 01:20 PM
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Got a good deal on some 2/0 marine cable, so that's the route I'm taking.
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Old 02-08-2010, 12:27 AM
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THHN is made for industrial/commerical use.

It is designed to be use in conduit, cabinets, motor and control systems.

It has a hard plastic coating which cracks when bent to sharply.

Will not withstand oil, heat, or UV light very long.

The outer plastic coating will start to peal off and fade/discolor then look UGLY!!!

Other than that, the strands inside are the same.


Garett
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Independant Electrical Contractors
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Old 02-08-2010, 08:16 AM
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Clarification

The OP has his wire already, but for the record; Twice here it is mentioned that THHN is not oil resistant. Simply not true. THHN is gasoline and oil resistant, that is what the thin nylon coating (outer layer) is for. The insulation is pvc. I do agree that its not really suitable for automotive use. Most higher quality automotive wire has temperature ratings of 125C. THHN is only 90C, but still higher than say TW building wire which is rated at 60C. In its proper application, size for size it can handle more current because of the higher temp rating. Some of the highest quality automotive wire types are GXL, SXL, & TXL. These are cross linked polyethylene insulation w/125C rating. GPT(80 C), HDT(85C), & TWP(105C) are some automotive types that are PVC insulation. It appears that the PVC is just lower temp rated.olnolan
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