How many #12 thhn conductor are allowed in half inch emt

Hints:

40% rule for conduit fill
Cross sectional area of #12 THNN
Cross sectional area (ID) of specific conduit

It is dependent upon the length of the conduit. If it is less than 24 inches long you can put as many wires in it as you can get in it, of course you may have to derate them...

GD,

Do you happen to have a working knowledge of the NEC code?

You must know what to do if more than 3 current carrying conductors are placed in a length of conduit. Or what condition are you trying to avoid by not stuffing the conduit almost full of ungrounded conductors?

Quote:

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Originally Posted by donf

GD,

Do you happen to have a working knowledge of the NEC code?

You must know what to do if more than 3 current carrying conductors are placed in a length of conduit. Or what condition are you trying to avoid by not stuffing the conduit almost full of ungrounded conductors?

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Why sure I do.. I know that the AHJ has the final say. Do you know that?

Sure do! :)