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Old 02-12-2013, 06:06 PM   #16
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Wiring up a dishwasher and disposal


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Originally Posted by sublime2 View Post
I'm not saying put both on one line.
Why can you not put anything else (receptacle) on the line.
Why dedicated?
You didn't, but the OP did. It used to be common that the disposal was on the same circuit as receptacles (at least in Chicago.) That's the way every house I've lived in was wired (even the 15 year old house I live in now.) My wife has literally fed everything known to man through our disposal. I'm probably going to install a monster disposal next year, and will probably need to install that dedicated 20A circuit as well.

Would having a disposal on the same circuit as receptacles be a big deal for most folks, probably not. I know a few folks that have a microwave on their countertop though. This could be problematic if the microwave and disposal were on at the same time.

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Old 02-12-2013, 06:17 PM   #17
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Wiring up a dishwasher and disposal


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Originally Posted by sublime2 View Post
I'm not saying put both on one line.
Why can you not put anything else (receptacle) on the line.
Why dedicated?
The presence of the receptacle or any other outlets opens the opportunity for something else, like a toaster oven, microwave, coffee maker, food processor, vacuum cleaner, etc... to be plugged in and potentially overload the circuit. You may think you won't do that, but someone else including subsequent homeowners may.

There are very specific codes for kitchens.
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Old 02-12-2013, 06:25 PM   #18
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Wiring up a dishwasher and disposal


On the other hand, I haven't seen anything addressing whether connecting an instant hot water dispenser to the disposal circuit is not acceptable.
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Old 02-12-2013, 06:30 PM   #19
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Wiring up a dishwasher and disposal


I believe most, if not all, dishwashers and disposals will say in their specs to run a separate circuit or share with each other.

There is no specific code saying disposals and dishwashers have to be on their own circuit. In fact, you according to the NEC, you could put lighting on those circuits.
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Old 02-12-2013, 06:40 PM   #20
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Wiring up a dishwasher and disposal


Other than overloading a common DW/DP circuit, I can't think of any other functional reason for dedicated lines, except perhaps the dishwasher has fancy microprocessor electronics and will choke on the transients if you throw some bones to grind in the disposal...
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Old 02-12-2013, 06:41 PM   #21
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Wiring up a dishwasher and disposal


Quote:
Originally Posted by k_buz View Post
I believe most, if not all, dishwashers and disposals will say in their specs to run a separate circuit or share with each other.

There is no specific code saying disposals and dishwashers have to be on their own circuit. In fact, you according to the NEC, you could put lighting on those circuits.
That's also my experience. I think this will also be something you will have to consider if your thinking about supplying other equipment or receptacles which is what the French Electrician was refering to ....




(2) Utilization Equipment Fastened in Place.
The total rating of utilization equipment fastened in place, other than
luminaires, shall not exceed 50 percent of the branch circuit
ampere rating where lighting units, cord-and-plugconnected
utilization equipment not fastened in place, or
both, are also supplied.


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