wiring breaker box

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Old 08-10-12, 09:17 AM
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wiring breaker box

i am installinga new dish washer and microwave with an exhoust hgood, what i need to know is what size wire should i use for the dish washer and the microwave, and also a 20 amp 0r 15 amp for the breaker box i have plenty of room to install seperat circuts
 
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Old 08-10-12, 09:45 AM
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Each needs it's own 20 amp circuit. The dishwasher could share with a garbage disposal but probably not the microwave hood because of the NEC percentage rule for built in appliances. You would use #12 two conductor cable (or conduit with THHN) for each.
 
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Old 08-10-12, 11:25 AM
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I agree, the over-range microwave definitely needs its own dedicated 20A circuit with 12ga wire. (Some smaller ones may only require a 15A, but if it's ever replaced in the future, you might as well run a 20A circuit not).

I would personally run a 14ga / 15A circuit for the dishwasher. Save a few bucks on wire unless it's cheaper/easier to use leftover 12ga. (Ray, let me know if I'm missing something important).
 
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Old 08-10-12, 12:13 PM
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I was thinking 20a for the dishwasher if you don't have a garbage disposer now as future proofing if you ever want one. Of course if you already have a dedicated GD feed then you may be able to use that for the dishwasher also.
 
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Old 08-10-12, 02:25 PM
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The cost difference between #14 and #12 wiring is not enough to justify NOT putting in a 20 ampere circuit for the dishwasher. The microwave oven requires a 20 ampere circuit.
 
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