10/4 MC for 240V Dryer?

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  #1  
Old 10-09-12, 10:52 AM
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10/4 MC for 240V Dryer?

Hi all,

I'm looking to have a new dryer circuit put in. I'll get an electrician to add in the circuit, but I'm thinking of doing the rough-in myself.

The dryer is 240V and should be on a 30A circuit, per the manufacturer. The cable needs to run about 50ft in an unfinished garage.

As far as I understand, I should use 10-gauge wire, protected. However, I'm having trouble finding 10/4 MC/AC cables anywhere. The store has 10/3 MC (and the dryer can use 3- or 4-wire), but I'm thinking that 4-wire would be better.

Does 10/4 MC/AC exist? Or do I have to run cables in a conduit?

Thanks!
 
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Old 10-09-12, 11:15 AM
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The dryer is 240V and should be on a 30A circuit, per the manufacturer... I'm having trouble finding 10/4 MC/AC cables anywhere. The store has 10/3 MC... Does 10/4 MC/AC exist?
Not really. You need to look for, and ask for, 10-3 MC WG (with ground). You should be able to find it at an electrical supply house if the Big Box stores don't have it.

(and the dryer can use 3- or 4-wire), but I'm thinking that 4-wire would be better.
It is, and it's required for compliance with modern codes.

That said, a 250' coil of 10-3 MC WG will probably set you back nearly $400.00. Unless you can find a supply house that will cut you the length you need, the individual conductors in conduit might be less expensive, as well as a cleaner install.
 
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Old 10-09-12, 11:16 AM
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10/3 with ground has 4 wires, black, red, white and green. Yes, four wires is better.
 
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Old 10-09-12, 11:18 AM
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Actually you need 10-3 MC. . The "3" refers to the number of conductors and does not include the ground in it's total. MC will have a ground wire in addition to the three (red, white, black) conductors.
 

Last edited by ray2047; 10-09-12 at 05:56 PM. Reason: Correct misinformation.
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Old 10-09-12, 12:14 PM
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Thank you guys! That explains it
 
  #6  
Old 10-09-12, 06:10 PM
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Why is it you want to use MC cable rather than NM B cable (aka Romex)?
 
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