Question about Dryers

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2 12/2AWG = 1 10/3AWG

Moving electric dryer w/ 4 wire receptacle and need to run 220v 30amp circuit to it. I have several possible routes to the main, the shortest- about 30' isthe most difficult to ''thread'' , the easy way is maybe 70'. 2 questions
:
1. what wire AWG does code call for either length run?
2. If 10/3 is needed, can one circuit using double run of 12/2AWG safely provide the same 220V service as single run of 10/3AWG to that 4 wire receptacle?

Thanks
Keith

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  • CaptKoKo Sep 27, 2009

    Please clarify, given with 12/2 w/ground I have a Black, a White and a bare ground wire in each cable. I use two 12/2 blacks for one hot phase, two 12/2 whites for the red hot phase, one ground wire for the white neutral and one ground wire for ground. Is this OK?

    kk

  • CaptKoKo Sep 28, 2009

    I am confused. each 12/2 w/ground has 3 wire. Times 2 is 6 total. 2 black, 2 white(now red) and 2 ground. The circuit breaker is a single 2 pole 30amp breaker, to use with 220VAC circuit I have the 2 blacks-as one- going to one pole of the breaker and the red(2 whites as one) going to the other - so much for the two hot phases. OK?
    Now the two ground wires. Do both go to ground? or one to neutral and one to ground? Is a single 12AWG wire adequate for neutral and a single 12AWG adequate for grounding a 220 circuit?

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Yes, with a double run of 12-2w/ground you'll end up with 2pairs of 12 for your 2 hot phases(you will need to mark one pair red to substantiate the 2 different phases) and each 12 gauge wire will carry 20 amp each alone, then you'll have 2 pairs of 12 with white insulation white for neutral is fine but the other pair for the safety ground will need to be marked or painted green where ever visible per N.E.C. i.e. main panel or dryer receptacle or hardwired into the unit itself,use 10-3w/ground its cheaper in the long run and you dont have to run a doubleheader

Posted on Sep 27, 2009

Testimonial: "dmftrucker was patient with me... it took a bit for all to sink in but I got good technical, code based advise from him. Thanks a Lot! kk"

  • daniel  hendrickson
    daniel hendrickson Sep 27, 2009

    yes all you need to do is make sure that where ever the whites are used as safety ground mark it with green tape, as for the other BLACK phase that I suggested marking one pair of the 2 pair red, you do not have to, its just a common courtesy, and as a reminder that its a 240 volt phase wire, but your not obligated to,if you use 10-3 W/Ground you dont have to worry about this step its there already inside the cable jacket....just make SURE the 2 wires that you are going to make your safety ground are marked,painted,or taped GREEN...as this is an N.E.C. code requirement!!!

  • daniel  hendrickson
    daniel hendrickson Sep 28, 2009

    that would work, but by new N.E.C. reg your neutral must be insulated also, and your one insulated conductor short, as using 2-12 insulated per phase for 4 wires then one more insulated white for the neutral which you could get by with due to "derating" the neutral because it only carries the un-balance of the current, but keith i still think you should go with 10-3W/ground then each hot single hot is good for 30 amp,also your neutral is good for the same, and your ground is in the same jacket all in one wire and its not that much more expensive,especially in labor savings by running only one wire to accomplish this and your neutral isn't "derated"

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