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Old 03-05-2010, 10:24 AM   #1
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Discussion on MW dedicated circuit


Quote:
Originally Posted by Scuba_Dave View Post
You need a new dedicated circuit for the microwave
Is there anything in the NEC (other than the requirements to follow the manufacturer's instructions) that requires it to be dedicated?

Mark

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Old 03-05-2010, 11:01 AM   #2
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Discussion on MW dedicated circuit


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Originally Posted by Scuba_Dave View Post
Yes, over the range microwaves require a dedicated circuit by NEC code
Many of these can pull 1800w
Code reference please?

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Old 03-05-2010, 01:16 PM   #3
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Discussion on MW dedicated circuit


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Originally Posted by Five Arrows View Post
It is true that code requires this to be on it's own 20 amp circut but we all know that it is possible to run a microwave on a 15 amp circut if there isn't too much else on it.
I'm still waiting for a code reference that says this needs to be a dedicated circuit.

Mark
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Old 03-05-2010, 04:26 PM   #4
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Discussion on MW dedicated circuit


Read section 200 of NEC for Load calculations
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Old 03-05-2010, 07:02 PM   #5
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Discussion on MW dedicated circuit


Quote:
Originally Posted by Scuba_Dave View Post
Read section 200 of NEC for Load calculations
Dave,

Without looking at my code book - Art. 200 is "Use and Identification of Grounded Conductors" and what would load calculations have to do with microwaves. The only place load calculations and branch circuits really overlap is the controversial requirement that limits receptacle outlets on commercial circuits due to the load calculation. That and the small appliance and laundry requirements.

If you are saying that a microwave is a continuous load (greater than 3 hours) and needs to apply the 80% rule, that's a stretch. Please cite a specific code section.

Thanks,

Mark
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Old 03-05-2010, 07:09 PM   #6
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Discussion on MW dedicated circuit


Keep reading
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Old 03-05-2010, 07:21 PM   #7
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Discussion on MW dedicated circuit


Quote:
Originally Posted by Scuba_Dave View Post
Read section 200 of NEC for Load calculations
I hate to be blunt, but as a Master Electrician with 20+ years experience, I know the code books like the back of my hand. Can you please just cite the specific code section and make your argument.

Thanks,

Mark
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Old 03-05-2010, 07:55 PM   #8
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Discussion on MW dedicated circuit


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Originally Posted by busman View Post
I'm still waiting for a code reference that says this needs to be a dedicated circuit.

Mark

Manufacturer's requirement on every built in microwave I've installed in the last 4 years.
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Old 03-05-2010, 08:03 PM   #9
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Discussion on MW dedicated circuit


Quote:
Originally Posted by busman View Post
Is there anything in the NEC (other than the requirements to follow the manufacturer's instructions) that requires it to be dedicated?

Mark
I mentioned this requirement earlier. Anything else?

Mark

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