Can I run 240 volt and 120 volt wiring together in a single wiremold system?

Question

I'm installing 2 240 volt baseboard heaters in an installation, connected by wiremold lines and want to run separate 120 volt duplex outlets with another 12-2 line from my breaker panel. Can I run both the 240 and 120 volt lines through the same wiremold? I am NOT going to use the heaters as a wire-race.

Answer 1

Sure as long as it fits.  Don't force it in either.  The only problem you'll have is a higher than normal build up of heat in that run of wiremold.  It may actully warp it some... but it will work.  

Answer 2

Yes, as long as they both fit in the wiremold. Both wires are insulated so there's no problem.

Answer 3

Yes but you'll need to run 12-3 romex wire. You'll need a neutral to get 120v. Make sure you ground all the heaters and outlets properly since you'll not running ground from the breaker.

Answer 4

Subject to the fill requirements and derating of the conductors it should be permissible under NEC. But the safest way to be certain on this is to ask the electrical inspector in your jurisdiction. Use of wire mold in a home is not common.

Answer 5

You will have to get the wire-fill charts from Wire-Mold (a Division of Pass & Seymour) to be sure you use the correct size raceway. If you are running Type NM cables in the raceway, you must use the actual cross sectional diameter of the cables to determine the conductor area, for flat or oblong cables, you are required to use the largest dimension as the diameter (see the Notes to the Chapter 9 Tables of the NEC). Remember to use the 40% fill column, as you will be using 3 or more conductors when installing a Cable Assembly wiring system.

You MAY have to derate the conductor ampacity of the cables, depending on how many current carrying conductors you have in a raceway. For the 240 volt circuits, only the two "hots" are counted; for the 120 volt cables, both the hot and the "neutral" conductors are counted. If you exceed 9 current carrying conductors in a raceway, you must derate the conductor's current carrying ability by 50%. That means that a #14 AWG copper conductor can only carry 12.5 Amps, and a #12 AWG conductor (copper) can only carry 15 Amps.

Your local inspector may also require you to apply the Ambient Temperature Adjustment Factors from the bottom of Table 310.16 to the conductors, depending on how close they are to the baseboard heating units.