15 amp 220 washer/dryer hookup

BilHam

My client is getting a Miele washer and dryer. They're 220v, with the big 4 prong plug, and they say you can use your old 30 amp line to feed them both, and run them both at the same time.
The old dryer was hard wired with 10/3 Bx from the double 30 breaker in a subpanel. I'm installing two big receptacles for the two units, but I have to put in a 4X4 junction box and feed off that.
My question is: can I just use 12/3 Romex to each receptacle, since the appliances are only 15 amps, or do I have to use 10/3? Using Romex is to code here, but the receptacles are capable of handling much more. Since the 12/3 would run separately from the junction box, it should handle the load of 15 amps, right?
I want to do this all to code; a short hank of 10/3 would do it, and I'm prepared to dumpster dive if I have to. But I have the 12/3 on hand.
Thanks.

JohnJ0906

Use 10-3.

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John from Baltimore
One Day at a Time
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jwhite

You say your client as if this is a job you are being paid for.

You cannot do electrical work for money legaly. Since you obviously do not even know the basics in the code, you have no business acting like an electrical contractor.

You should leave the electrical contracting to the licenced electricians.

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Master Electrician

BilHam

My "client" is my sister, who lives in the family house 2 miles away. She has MS and cares for our 80 year old mom with AD. I'm helping her out and saving her money, doing the work during the hours I'm on duty there.
I legally rewired my last house from the panel up, with drawings, permits and inspections, so I had to learn a few of the code "basics".

jwhite

The facts that your sister and mom are both not well and living in the home, and that you do not know the basics are just proof that I am right and you should hire a pro.

Why do you want to risk thier safety. Do you think saving a few dollars now is worth any of thier lives?

dude, if you have no idea what size wire goes to what size breaker, or if you can use a smaller size breaker just because you install a j box, then you have no business risking someone elses safety.

You are not doing anyone any favors by MISWIRING thier home.

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Master Electrician

BilHam

j.--
I wired the two receptacles with 10/3 Romex. I'll be there when the appliances arrive. I'll run the first two loads of laundry Friday. I'll be sleeping there on duty with my mom. If the smoke alarm goes off I'll think of you.

NateHanson

But he's on here asking about the right way to do things, isn't he?