I picked up this question on another news group.
Then I wrote:
Anyone got a reference to the appropriate section of the Electrical
Code (or whatever)?
Our first and second dishwashers have, for the last 40 years or so,
been plugged into an under counter-top outlet which as far as one
knows is tapped into a regular run of counter outlets fed with #12AWG
and a 20 amp breaker!**
Since am planning to do some work from the sub-panel into the closet
area behind the dishwasher etc., shortly, would be useful to know and
add a dedicated circuit if necessary!
seperate 20 amp circuit.
new dishwashers have high wattage heaters and can trip 15 amp
besides if your working on a hard wired dishwasher its best if
powering it off doesnt kill other things
There is no such thing as too many circuits!
You might as well run one, since you will be "there".
And bring 220 over (3 wire bx/romex), in case you get a 220 unit, ditto for
the garbage disposal. 220 V hookups are always better, balance the load
better to the main service, easier on the wires.
Having said that, you could have 20 major appliances, toasters, microwaves
on one circuit, and be ok.... as long as you just use one at a time!
And, a high current appliance, and say a a lite/electric can opener etc. on
one circuit is no big deal either.
Altho, from a purist pov, it is nice to have heavy-draw appliances on
So apparently, your current set up is fine, for your use pattern. But
wiring for the future is never a bad idea, costs/time permitting.
Under certain circumstances, you can feed both a dishwasher and a disposal
with a single circuit, but certain criteria must be met. Personally, I would
just run dedicated circuits for each. You'll find the details in Nec 430.33
Another note: It used to be acceptable to hard wire a dishwasher as the
"unit switch" would serve as the required disconnect. Pretty much all newer
dishwashers have electronic switching and no longer use "unit switches" , so
a disconnecting means must be provided.
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