Install wiring for a ceiling fan on a muggy humid windless day in georgia in august to appreciate the double h 194 f rating.
Nm in the attic.
For example the sleeve enclosing nm cable exiting the attic and feeding the floodlights mounted on the eaves of a building may only be 12 to 24 inches in length although there may be construction applications where the sleeve is much longer.
Or 03 24 2017 01 08 am.
We often find damaged nm cable in attics especially where the cables are running near or across the scuttle opening and here s several ways that it happens.
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In a basement you can only staple 6 and larger to the bottom of the floor joists otherwise you have to bore holes for smaller gauge nm.
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Normally the cables carry 10 12 or 14 gauge conducting wires for individual house circuits.
Nm cable is simply a bundle of individual conducting wires wrapped in a plastic vinyl outer sheathing.
Read it again you can run nm across trusses or joists if done within 6 ft of the attic access you must provide a protection board as high as the wire to prevent damage.
Then again the i squared r ohmic heat buildup of cable in conduit isn t substantially worse than ambient conditions of nm surrounded by insulation in a hot summer noon attic.
To make it easier to pull nm in conduit.
Also if they re run in an attic space above the insulation then they would also be adjusted for the attic ambient temperature.
Any nm cables bundled together for more than 24 will require an ampacity adjustment.