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Old 06-24-2011, 08:31 AM   #1
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Junction Box behind Microwave?


I'm remodeling my kitchen, and replacing/relocating some appliances. To do so, I need to extend an 8 ga circuit. Is it ok to put a junction box inside the cabinet, behind where the microwave will be installed? It's a standard countertop microwave, with a trim kit that will cover the entire enclosure.

The other option would be in the attic directly above the same cabinet.

Is there a preferred approach?

Thanks

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Old 06-24-2011, 08:44 AM   #2
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Junction Box behind Microwave?


Only if you can open the cabinet and see the junction box. Otherwise, it is illegal in the scope, due to you have to remove the microwave to get to the junction box. It would be the same as installing a cabinet, and not cutting an access hole where a junction box was placed on the wall. Think of it this way, if there is a problem, how is the next electrician or home owner going to know where to look.

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Old 06-24-2011, 09:35 AM   #3
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Junction Box behind Microwave?


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Only if you can open the cabinet and see the junction box. Otherwise, it is illegal in the scope, due to you have to remove the microwave to get to the junction box. It would be the same as installing a cabinet, and not cutting an access hole where a junction box was placed on the wall. Think of it this way, if there is a problem, how is the next electrician or home owner going to know where to look.

Thanks! I assume there's no issue putting junction box for 8 ga in the attic - correct? Any special considerations for that gauge?
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Old 06-24-2011, 09:56 AM   #4
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Junction Box behind Microwave?


attic is fine as long as accessible.
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Old 06-24-2011, 10:06 AM   #5
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Junction Box behind Microwave?


Make sure you use the proper connectors to secure the cable where it meets the other going to the new receptacle. BTW, is this Aluminum or Copper #8.
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Old 06-24-2011, 10:28 AM   #6
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Junction Box behind Microwave?


It's copper
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Old 06-24-2011, 12:09 PM   #7
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Junction Box behind Microwave?


Is this stove wiring?
Is it 4 conductor?
3 condutor wiring is prohibited from being extended.
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Old 06-24-2011, 12:23 PM   #8
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Junction Box behind Microwave?


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Originally Posted by richp0 View Post
I'm remodeling my kitchen, and replacing/relocating some appliances. To do so, I need to extend an 8 ga circuit. Is it ok to put a junction box inside the cabinet, behind where the microwave will be installed? It's a standard countertop microwave, with a trim kit that will cover the entire enclosure.

The other option would be in the attic directly above the same cabinet.

Is there a preferred approach?

Thanks
The NEC states the following;


314.29 Boxes, Conduit Bodies, and Handhole Enclosures to Be Accessible.
Boxes, conduit bodies, and handhole enclosures shall be installed so that the wiring contained in them can be rendered accessible without removing any part of the building or, in underground circuits, without excavating sidewalks, paving, earth, or other substance that is to be used to establish the finished grade.

A junction box behind the M/W is compliant is long as it is accessible when the M/W is removed. It is no different then the receptacle that the M/W plugs into, or a junction box for a wall mounted oven. The M/W is not part of the building or structure.
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Last edited by electures; 06-24-2011 at 12:27 PM.
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Old 06-24-2011, 12:32 PM   #9
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Junction Box behind Microwave?


electures, if you have to remove screws to detach the microwave, it is considered a non-compliant use of the junction box. That is why when over the range microwaves are installed, their plugs are up in the cabinet, not directly behind it. If it was a counter-top, or slid into a microwave cabinet above the stove, then yes it is considered removable without having to detach it from the structure.
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Old 06-24-2011, 12:53 PM   #10
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electures, if you have to remove screws to detach the microwave, it is considered a non-compliant use of the junction box. That is why when over the range microwaves are installed, their plugs are up in the cabinet, not directly behind it. If it was a counter-top, or slid into a microwave cabinet above the stove, then yes it is considered removable without having to detach it from the structure.
Sorry, you are incorrect. The M/w is not part of the structure. It is an portable appliance.
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Old 06-24-2011, 01:03 PM   #11
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Junction Box behind Microwave?


It's a 3-conductor cable for a cooktop.

As noted earlier, the microwave has a trim kit. The trim kit screws onto brackets, which fasten to the insides of the cabinet.
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Old 06-24-2011, 01:04 PM   #12
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Sorry, you are incorrect. The M/w is not part of the structure. It is an portable appliance.
Again, it is a part of the structure, when it is screwed into the securing rail to hold it over a range, or counter. The rules apply, because you have to remove it from the structure, in order to get behind it. That is why again, they place the outlet for them above in a cabinet, so it can be de-powered in case of incident that may warrant so.
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Old 06-24-2011, 01:07 PM   #13
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It's a 3-conductor cable for a cooktop.

As noted earlier, the microwave has a trim kit. The trim kit screws onto brackets, which fasten to the insides of the cabinet.
In that case, follow the directions to place the jb up in the attic, or in the cabinet if cut out is able to be made.
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Old 06-24-2011, 01:16 PM   #14
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Junction Box behind Microwave?


What about other comment from jbfan, that "3 condutor wiring is prohibited from being extended". Does that mean that I really need to run a new line from the service entrance?
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Old 06-24-2011, 01:43 PM   #15
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Again, it is a part of the structure, when it is screwed into the securing rail to hold it over a range, or counter. The rules apply, because you have to remove it from the structure, in order to get behind it. That is why again, they place the outlet for them above in a cabinet, so it can be de-powered in case of incident that may warrant so.
According to the CEC/OESC and numerous ESA inspectors, this is correct.

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