Rough In Electrical for Double Oven

[purplezr2]

In fully transparency, this is for my house not my shop....

So I have done a significant amount of wiring on my garage/shop with praise from the inspector on the neatness/origination/general work, but I'm struggling with rough in for my Double Oven and Range top of my kitchen.

Both will be 50amp circuits so 6/3 per the appliances my wife has picked. I plan to mount the junction boxes in the back the cabinet for easy of wiring. Is it as simple as fastening to the stud close to where the box will be within the cabinet and leaving a whip of wire to come through the sheetrock.

Plan is for 4x4 metal box with NM-Se Cable connector.

Last part to get my rough in completed prior to getting the inspector out.

 

[75gmck25]

You should download the installation instructions for each appliance first, since they often have diagrams and measurements for locating the power. If you get the junction box in the wrong location it might not have clearance for the appliance to slide into place. You will also find out if it needs a 6/3 feed (I think most now do), and whether it's hard-wired or uses a 4 wire plug.

Many appliances have gone over to using a plug-in power feed instead of hard wire. I think it's part of simplifying the process for installation. If the power cord reaches, just plug it in and go.

 

[wyliesdiesels]

You should download the installation instructions for each appliance first, since they often have diagrams and measurements for locating the power. If you get the junction box in the wrong location it might not have clearance for the appliance to slide into place. You will also find out if it needs a 6/3 feed (I think most now do), and whether it's hard-wired or uses a 4 wire plug.

Many appliances have gone over to using a plug-in power feed instead of hard wire. I think it's part of simplifying the process for installation. If the power cord reaches, just plug it in and go.

agreed

 

[alfredeneuman]

I'd suggest you use 4-11/16" boxes instead of 4X4s.
4X4s don't leave much "wiggle room" when a 50A receptacle is used,
Even a hardwired oven is a tight fit.

 

[Dagny]

this ^

 

[purplezr2]

I agree will all the above, I'm just wondering how to do rough in. Since I can have the drywall in for all the other electrical, obviously won't have the cabinet in yet, so I can't install the box in the cabinet and have it in place.

Bosch oven, instructions say the box can be above or below, comes with metal flexible conduit whip. Doesn't list length

 

[Bert_]

They list a location for the junction box usually. Put your box there so it goes through the Sheetrock and cabinet. Use a cover with a knockout to connect to whip to the appliance

 

[dcg9381]

Make sure you use a deep enough box for 6/3. Last over I did, we correctly accounted for the oven size, but the electrician put the box on the outside of the drywall and we had to recess it after drywall was up.

Appliances usually have enough "whip" length to accommodate various positions of the box, but they also may have a "preferred" location due to varying depth of the appliance assembly at certain heights.

 

[sparky 1971]

I use a 2-1/8" deep 4X4 box with a bracket mounted flush with the face of the stud then install a 2 gang 1-1/4" raised mud ring that will bring the face out of the drywall and if it isn't flush with the cabinet, it's close enough. For hardwired ovens I drill a 7/8" hole (1/2" knockout size) in the center of a metal weatherproof blank plate and throw the gasket away.

RACO 4" Galvanized Steel Square Electrical Box with Bracket

The RACO® four-inch, two-gang Galvanized Steel Square New Work Box is 2-1/8 inches deep. It features 1/2- and 3/4-inch knockouts for a variety of wiring applications. It's recognized by contractors for its versatility in commercial and residential applications.

www.menards.com

RACO 2-Gang Galvanized Steel 1-1/4" Raised 4" Square Electrical Box Mud Ring

The RACO 4" Square 2-Device Mud Ring is raised 1-1/4 of an inch. It features angled mounting slots to correct misalignment.

www.menards.com

Sigma Engineered Solutions® 2-Gang Metal Blank Gray Weatherproof Cover

Sigma's two-gang weatherproof blank covers are used to protect junction boxes or boxes not in use. Stamped steel blank covers are powder coated for maximum corrosion resistance. These UL and CSA listed flat covers compliment two-gang weatherproof boxes installed in wet, damp or dry locations...

www.menards.com

 

[alfredeneuman]

For hardwired ovens I drill a 7/8" hole (1/2" knockout size) in the center of a metal weatherproof blank plate and throw the gasket away

I do the same thing. I do it for modular office cubicles too.

 

[inphx]

I put an AC disconnect in the adjacent cabinet back wall and wired the whip into that.

 

[Chuckster in NJ]

Just a heads up!
New NEC requires GFI protection on the receptacle for a PLUG CONNECTED stove in a kitchen.…….. 2 pole GFCI breaker in the panel will meet the new code.

 

[purplezr2]

Just a heads up!
New NEC requires GFI protection on the receptacle for a PLUG CONNECTED stove in a kitchen.…….. 2 pole GFCI breaker in the panel will meet the new code.

Neither of mine will be plugged, but this is a good catch as I will need a new breaker for my dryer as it had just a conventional 30amp breaker in the old panel, and when I move it over that will need to change.

 

[PCustoms]

Just a heads up!
New NEC requires GFI protection on the receptacle for a PLUG CONNECTED stove in a kitchen.…….. 2 pole GFCI breaker in the panel will meet the new code.

Do plug connect 240v double wall ovens exist?

 

[Norcal]

I put an AC disconnect in the adjacent cabinet back wall and wired the whip into that.

A/C pullout disco's really are not made for 120/240V loads, as there is no provision for a neutral. Just my opinion.

 

[Skooterj]

When I built my house, I gave a copy of each appliance's manual to my electrician, my cabinet installer and my plumber.

If I had been doing any of that myself, I would have had those manuals readily available.

 

[wyliesdiesels]

A/C pullout disco's really are not made for 120/240V loads, as there is no provision for a neutral. Just my opinion.

but but pete will still try to add an insulated neutral bar and cram it into that itty bitty box...

 

[alfredeneuman]

A/C pullout disco's really are not made for 120/240V loads, as there is no provision for a neutral. Just my opinion.

...but there is enough room for a wire nut.

 

[Kezorm]

Just a heads up!
New NEC requires GFI protection on the receptacle for a PLUG CONNECTED stove in a kitchen.…….. 2 pole GFCI breaker in the panel will meet the new code.

NEC 2023 requires GFCI for these appliances no matter what - hardwired or plug connected. There's no language limiting this requirement to just receptacle outlets.

From MN update on NEC 2023 - https://www.dli.mn.gov/sites/default/files/pdf/NECFAQ23.pdf

 

[purplezr2]

NEC 2023 requires GFCI for these appliances no matter what - hardwired or plug connected. There's no language limiting this requirement to just receptacle outlets.

From MN update on NEC 2023 - https://www.dli.mn.gov/sites/default/files/pdf/NECFAQ23.pdf

I was just reading the Electrical Inspection Checklist on that is on the Dept of Labor and Industry website, I noticed this section as well, and came to look to see if I read incorrectly the post a few above saying it only applied to corded devices.

I was going to give the inspector a call to double check, as I will need to get breakers coming asap(Menards is 2 hours away, and they don't carry the 40amp I need for the cooktop.

 

[purplezr2]

I use a 2-1/8" deep 4X4 box with a bracket mounted flush with the face of the stud then install a 2 gang 1-1/4" raised mud ring that will bring the face out of the drywall and if it isn't flush with the cabinet, it's close enough. For hardwired ovens I drill a 7/8" hole (1/2" knockout size) in the center of a metal weatherproof blank plate and throw the gasket away.

RACO 4" Galvanized Steel Square Electrical Box with Bracket

The RACO® four-inch, two-gang Galvanized Steel Square New Work Box is 2-1/8 inches deep. It features 1/2- and 3/4-inch knockouts for a variety of wiring applications. It's recognized by contractors for its versatility in commercial and residential applications.

www.menards.com

RACO 2-Gang Galvanized Steel 1-1/4" Raised 4" Square Electrical Box Mud Ring

The RACO 4" Square 2-Device Mud Ring is raised 1-1/4 of an inch. It features angled mounting slots to correct misalignment.

www.menards.com

Sigma Engineered Solutions® 2-Gang Metal Blank Gray Weatherproof Cover

Sigma's two-gang weatherproof blank covers are used to protect junction boxes or boxes not in use. Stamped steel blank covers are powder coated for maximum corrosion resistance. These UL and CSA listed flat covers compliment two-gang weatherproof boxes installed in wet, damp or dry locations...

www.menards.com

I used this method, seem to provide an easy clean result,