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Gas appliance recep on with microwave #100461 11/20/06 12:44 AM
Joined: Nov 2006
Posts: 3
97_watts Offline OP
Junior Member
I had an inspector fail an install where we pulled a receptacle for the gas cooktop off of the microwave circuit(20amp dedicated). He says the microwave has to be on its own circuit, but most micros only run in the 1100W range. Any opinions?

2017 / 2014 NEC & Related Books and Study Guides
Re: Gas appliance recep on with microwave #100462 11/20/06 02:15 AM
Joined: Oct 2004
Posts: 803
mxslick Offline
First off, welcome to ECN!! [Linked Image]

Actually, I'd try to state the case in the oposite direction; i.e. the gas cooktop will only pull about 1 amp or so for the light(s) and ignitor.....mention the combination range/microwave and/or microwave/exhaust fan units as possible precedents. Hardly a serious load factor for the microwave circuit.

But sometimes (actually many times) the Code turns a blind eye to reality and you may be stuck rewiring or adding a recept to the general appliance circuit in the kitchen.

Before someone I know quite well, comes on to blast me about the Code remark [Linked Image] I must say that the intention of the Code in this case is a very good one. It would be quite easy to overload the gen. purp. circuit with the microwave and just one other appliance.

Usually a polite conversation with the inspector will allow this to pass. But be ready to quote Code references that will help your case.

Good luck.

Stupid should be painful.
Re: Gas appliance recep on with microwave #100463 11/20/06 03:03 AM
Joined: Jul 2004
Posts: 9,485
gfretwell Offline
I don't see how he can require a dedicated circuit for an appliance that drwas less than 50% of circuit ampacity (2400va).
... unless it is juts because he can [Linked Image]

Greg Fretwell
Re: Gas appliance recep on with microwave #100464 11/20/06 03:26 AM
Joined: Jun 2004
Posts: 176
PEdoubleNIZZLE Offline
Welcome 97_watts

One of the electricians I worked with had a similar situation in a bathroom. He wired a night light (in-wall LED type) downstream from the GFCI. He was failed on this until he could reason with the inspector that there's probably going to be a night light plugged in anyways, and the night light had a rating of 0.1W (which is probably a lot more than it actually pulls). He said the inspector probably passed him because he was nice about it.

Make your point, but be respectful about it.

Electrically speaking, it should be okay as long as the calculated voltage drop is within the specs of the stove, which I'm sure it is (if it's too under voltage, the worst case scenario would be the electronic pilot doesn't light, causing a gas leak if the homeowner doesn't see that it's not lit. This could be one point he makes. remember, I said worst case scenario, as in, say, 1 in a million... blue moon... pigs fly... 3 legged horse won... you get the idea.)

By the way, is it an electrical inspector, or building inspector?

Re: Gas appliance recep on with microwave #100465 11/20/06 07:33 AM
Joined: Sep 2006
Posts: 111
Eddy Current Offline
Quote:but most micros only run in the 1100W range.

What is keeping the home owner from putting a huge microwave in there? I know that most don't draw as much as they used to but code is code!

FYI- In Canada, we can put the gas range receptacle on the same circuit as the dining area receptacle. -Sorry, I know that this is the NEC forum, I like to compare all the little differences there is between NEC and CEC.

Re: Gas appliance recep on with microwave #100466 11/20/06 12:32 PM
Joined: Jan 2005
Posts: 5,316
renosteinke Offline
Cat Servant
Code does require a dedicated microwave circuit ...but ONLY if the micro in question as part of an 'over the range and exhaust hood' install. Event there, the requirement is an indirect one ... the dedicated circuit is called for IF the hood is cord & plug connected, only because a micro MIGHT be added later.

It is quite possible that the inspector got confused on this point - dang them code seminars! [Linked Image] In general, a micro can be plugged into any receptacle - even the countertop general purpose ones- and I suspect the stove igniter can come off them as well.

Now, as to the igniter tripping the GFI, I simply don't know if that's a concern.

Re: Gas appliance recep on with microwave #100467 11/20/06 02:42 PM
Joined: Aug 2003
Posts: 1,374
Ryan_J Offline
Take a look at 422.16(B)(4)

Ryan Jackson,
Salt Lake City
Re: Gas appliance recep on with microwave #100468 11/20/06 02:51 PM
Joined: Jul 2004
Posts: 9,485
gfretwell Offline
I will look at that (NEC 2005) on December 8 ... if the state doesn't push it back again

[Linked Image]

Greg Fretwell
Re: Gas appliance recep on with microwave #100469 11/20/06 03:24 PM
Joined: Mar 2001
Posts: 345
tdhorne Offline
Ryan_J Wrote: Take a look at 422.16(B)(4)

OK I'll bite. How does that apply to the matter at hand? Is this an over range microwave and exhaust hood combination unit?

Tom Horne

"This alternating current stuff is just a fad. It is much too dangerous for general use" Thomas Alva Edison
Re: Gas appliance recep on with microwave #100470 11/20/06 04:22 PM
Joined: Oct 2005
Posts: 100
JJM Offline
At the rate things are going, a 2,000 SF or larger home will soon need 400A service just so you can get two 42 breaker panels for all the dedicated circuits.

Either that, or the 42 breaker panel limit imposed on manufacturers needs to be lifted to reflect modern realities.


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