UF vs NM-B wire?

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Old 02-17-06, 06:48 AM
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Question UF vs NM-B wire?

Could someone please tell me the difference.
I believe the UF-B is for outdoor wiring and perhaps dampness issues, also appliances like washing machines and dishwashers. I see a clear plastic wrapping around each wire that is not there on NM-B wire. Is this correct?
If so or if not, can a line with one type be combined with the other? Help is appreciated.
 
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Old 02-17-06, 07:09 AM
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UF is rated for outdoor use.

NM is not rated for outdoor use, and will eventually rot if it gets wet.

While you can use UF wire indoors where NM is permitted, UF is harder to work with.

To join the two together you simply wire nut them like any other two wires.

Washing machines, dishwashers and other "wet" or "damp" appliances do not need UF wire, they can be NM, assuming NM is allowed where you live.
 
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Old 02-17-06, 07:17 AM
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NM-B is normally used for dishwashers and washing machines in a residence.

UF (underground feeder) type cable is for underground installations. It can be used inside but seldom is for cost reasons. It may be used in place of NM-B IF the insulation rating is 90 Deg C. There is no issue with hooking the 2 types together using approved enclosures and splicing methods. UF may not be used where exposed to direct sunlight unless identified for such use.
 
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