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Old 02-11-2013, 10:38 PM   #1
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Wiring up a dishwasher and disposal


I'm renovating my kitchen, and on the permit, the building official notes that the dishwasher and food disposal unit

"must be on two separate circuits of 20A each"

Does the code allow me to hook up any other recepticles on the same circuit as the appliance as long as the two appliances are not together on the same circuit? Or does "separate" really mean "dedicated"? 20A dedicated for each appliance sounds like overkill and I'd like to put more recepticles on those circuits as I'm quickly using up space in the breaker box.

I know I could go down to city hall and ask them personally but that's a hassle and just thought I'd ask you guys if this is a code requirement. What is commonly done in this situation?

Thanks!


Last edited by lmorsino; 02-11-2013 at 10:43 PM.
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Old 02-11-2013, 10:52 PM   #2
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Wiring up a dishwasher and disposal


From what the inspector is saying, you need to install a separate 20A circuit for each appliance.

This is not a NEC requirement. This would be a local amendment to the NEC.

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Old 02-11-2013, 11:41 PM   #3
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Wiring up a dishwasher and disposal


Sometimes you can run them on a MWBC- "Multi Wire Branch Circuit". You run 12-3 on a double pole breaker and split the neutral at the junction. I kinda like this since you have to turn both off to work on one of the other. They are piped together and I like doing it that way.

Of course you should check with the local inspector to see what he thinks.

You could also ask if that is a local code amendment or NEC requirement.
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Last edited by rrolleston; 02-11-2013 at 11:43 PM.
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Old 02-12-2013, 01:28 AM   #4
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Wiring up a dishwasher and disposal


Quote:
Originally Posted by lmorsino View Post
I'm renovating my kitchen, and on the permit, the building official notes that the dishwasher and food disposal unit

"must be on two separate circuits of 20A each"

Does the code allow me to hook up any other recepticles on the same circuit as the appliance as long as the two appliances are not together on the same circuit? Or does "separate" really mean "dedicated"? 20A dedicated for each appliance sounds like overkill and I'd like to put more recepticles on those circuits as I'm quickly using up space in the breaker box.

I know I could go down to city hall and ask them personally but that's a hassle and just thought I'd ask you guys if this is a code requirement. What is commonly done in this situation?

Thanks!


I know it used to be allowed on MWBC ( mulitwire branch circuit ) however a nice gotcha this part useally get quite few peoples off guard on this part is.,

A) either appalince shall not have more than 50% of circuit rating which it mean it can not be more than 7.5 amp on 15 amp circuit or 10 amp on 20 amp circuit.

B) I do not know what your local code may required a GFCI for garbage dispoal unit so that is kinda toss up on that part only your inspector will know the details.

And more and more dishwasher and garbage dispoal unit is getting more powerfull so the amp rating do creep up so a new good quality dishwasher can hit high as 12 amp so that will kill the deal with MWBC so that one reason why it have to be it own circuit ditto with garbage dispoal unit.

Now the other reason why I say seperated circuit due some of the dishwasher I know in state side can be cord et plug attachment or hard wired but the key issue is disconnecting means with cord and plug attachment that is not a issue when you work on the dishwasher all you have to do is unplug it. but hard wired verison you will need a lock out tab to keep prevent from the breaker being turn on.

The reason why lock out on the breaker due it is not in sight of breaker box.

Hope that help you with this part.

Merci,
Marc
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Last edited by frenchelectrican; 02-12-2013 at 01:31 AM.
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Old 02-12-2013, 01:41 AM   #5
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Wiring up a dishwasher and disposal


Separate lines but not dedicated.

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Old 02-12-2013, 08:23 AM   #6
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Wiring up a dishwasher and disposal


Read the OP. his inspection department is requiring separate 20 A dedicated circuits.
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Old 02-12-2013, 11:00 AM   #7
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Wiring up a dishwasher and disposal


Quote:
Originally Posted by lmorsino View Post
I'm renovating my kitchen, and on the permit, the building official notes that the dishwasher and food disposal unit

"must be on two separate circuits of 20A each"

Does the code allow me to hook up any other recepticles on the same circuit as the appliance as long as the two appliances are not together on the same circuit? Or does "separate" really mean "dedicated"? 20A dedicated for each appliance sounds like overkill and I'd like to put more recepticles on those circuits as I'm quickly using up space in the breaker box.

I know I could go down to city hall and ask them personally but that's a hassle and just thought I'd ask you guys if this is a code requirement. What is commonly done in this situation?

Thanks!
The NEC uses the term 'individual' branch circuit for dedicated or separate. As K Buz has mentioned you need a 20 amp branch circuit to each appliance .. nothing else can be on those circuits. It has become the norm in most areas of the country AFAIK.
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Old 02-12-2013, 12:08 PM   #8
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Wiring up a dishwasher and disposal


Wow, thanks for all the helpful responses, gentlemen...I guess I will just wire it with two dedicated 20A circuits
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Old 02-12-2013, 12:25 PM   #9
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Wiring up a dishwasher and disposal


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The NEC uses the term 'individual' branch circuit for dedicated or separate. As K Buz has mentioned you need a 20 amp branch circuit to each appliance .. nothing else can be on those circuits. It has become the norm in most areas of the country AFAIK.
What is the reasoning/thinking behind these appliances being on their own dedicated circuit?
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Old 02-12-2013, 02:09 PM   #10
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What is the reasoning/thinking behind these appliances being on their own dedicated circuit?
The potential amperage that they might draw.
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Old 02-12-2013, 02:18 PM   #11
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If we're just talking about the "potential" amps they might draw, isn't that what circuit breakers are for? What is wrong with simply adding up the power needs of the two appliances and providing a circuit that can handle that much power?

Let's say the disposal draws 10A and the diswasher is rated at 8.5A. Why is a single 20A circuit not sufficient?
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Old 02-12-2013, 02:25 PM   #12
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Wiring up a dishwasher and disposal


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Originally Posted by lmorsino View Post
If we're just talking about the "potential" amps they might draw, isn't that what circuit breakers are for? What is wrong with simply adding up the power needs of the two appliances and providing a circuit that can handle that much power?

Let's say the disposal draws 10A and the diswasher is rated at 8.5A. Why is a single 20A circuit not sufficient?
Because there are dishwashers and disposals that draw more than that. Disposals also draw more amperage when people (like my wife) shove too much crap in them Circuit breakers aren't meant to be repeatedly tripped. This will also heat up the wiring, and can potentially damage it.

Then there's the fact that the inspector "said so."

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Old 02-12-2013, 02:28 PM   #13
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Wiring up a dishwasher and disposal


So the real reason is to provide yet another layer of redundancy for people who don't understand how electricity works. At the expense of everyone else.
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Old 02-12-2013, 02:34 PM   #14
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So the real reason is to provide yet another layer of redundancy for people who don't understand how electricity works. At the expense of everyone else.
Electricity is theory; nobody really "knows" how it works

Even those that have a good understanding of electricity wouldn't want a single 20A circuit for a dishwasher and disposal.
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Old 02-12-2013, 05:55 PM   #15
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Wiring up a dishwasher and disposal


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Originally Posted by diystephen View Post

Electricity is theory; nobody really "knows" how it works

Even those that have a good understanding of electricity wouldn't want a single 20A circuit for a dishwasher and disposal.
I'm not saying put both on one line.
Why can you not put anything else (receptacle) on the line.
Why dedicated?

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