Can romex condcutors be installed in emt?

[roger]

Paul, this thread has been idle since February, you should probably start a new thread with your topic.

Roger

 

[infinity]

because neutrals don't count as current carrying conductors when derating

That doesn't sound quite right!

Even when using both phases, if the neutral for a circuit on one phase is a different wire than the neutral for a circuit on the other phase, their currents
do not cancel and the heating effect adds. So each separate neutral must count as a current carrying conductor.

In the case of multiwire circuits with a common neutral, it is true that the neutral need not count as a current carrying conductor, because if you loaded both hot legs up to the max, the neutral current would be zero. So the maximum current carried by the three wires (two hots plus neutral) can only be twice the maximum current carried by any one wire.

So it is necessary to count neutrals unless they are the common neutral of a multiwire branch circuit.

I think that you may have taken Hurk's quote out of context. He was responding to a question about MWBC's.

Yes, for a two wire circuit both conductors are considered CCC's. For a 3-wire MWBC, now here's the tricky part, where the system is 120/240 the neutral is not considered a CCC. Use the same 3-wire MWBC from a 208/120 volt system and the neutral does count as a CCC. So when applying derating with neutrals from MWBC's you must consider the system from which the circuit originates.

 

[glene77is]

Can-romex-condcutors-be-installed-in-emt

Can-romex-condcutors-be-installed-in-emt

Looks like iWire gets the first and last say for the OP. :slaphead:

Yes you can install NM in EMT see 358.22
Some feel the sheath has to stay on to comply with 300.11 which requires the conductors to be identified.
You can never run NM in a conduit in a wet location. see 300.9
(2008 NEC