Through the Wall and Into a Cabinet

[Little Bill]

I need to run a 40A circuit from the panel to under the sink for a tankless water heater. Don't get me started on the electric tankless, but it's what the HO wants, even though this one is overkill just for a point of use. It is a 9.5K unit, thus the 40A circuit.

In the pictures you see the panel which is in a utility room next to the kitchen. The problem is the house has a crawl but the utility room is on a slab. The HO is ok with coming out the bottom of the panel then through the wall into the kitchen. It should either come out behind the stove or inside a cabinet. I will have to enter the cabinet anyways because that's how she wants it run.

Would it be compliant to just run the 8-2 N/M inside the cabinet up towards the top and secure it well? Or would I need to sleeve it all the way to the sink?

Also, when going through the brick wall under the panel, would it be better to just drill through the brick or remove 1/2 of a brick and fill in around the LB?

 

[hurk27]

Of course NM can't be run through the brick without a sleeve 334.12(B)(2) but after that if you come out under the cabinet many inspectors dont think NM under a cabinet is subject to be damaged if run up out of the way, so it will depend upon your inspector, how many hard wire disposals have just NM going to them?, but when you use the LB and conduit through the brick as a sleeve you have to secure the NM within 6" of it exiting and provide a bushing to prevent any damage to the cable, also how are you going to provide a disconnect for the TWH? lockable breaker is one way?

 

[ActionDave]

No need to sleeve the wire in the cabinet, IMO.

As for getting through the brick- I use a core bit to score an nice clean edge about an inch deep, then I blast on through with a regular hammer drill bit. Patch up with some Quickcrete mortar or grey caulk.

 

[iwire]

Of course NM can't be run through the brick without a sleeve 334.12(B)(2)

I disagree.

334.12(B)(2) Where embedded in masonry, concrete, adobe, fill, or
plaster

Running an NM through a drilled hole is not embedding it in masonry unless you grouted it in.

 

[Dennis Alwon]

Running an NM through a drilled hole is not embedding it in masonry unless you grouted it in.

I agree but I have seen jobs turned down because the nm was not protected from damage. We can argue that all day but it is an ahj call. Brick and block have sharp edges and emt is required to be bushed when nm is sleeved thru it because of the this reason.

 

[iwire]

I agree but I have seen jobs turned down because the nm was not protected from damage. We can argue that all day but it is an ahj call.

It is an AHJ call but that was not the code cite hurk provided.

Brick and block have sharp edges

I would argue that one all day, I have never cut myself on a sharp edge of brick or block.

and emt is required to be bushed when nm is sleeved thru it

As far as I know only in unfinished basements and crawl Spaces.

 

[Little Bill]

Of course NM can't be run through the brick without a sleeve 334.12(B)(2) but after that if you come out under the cabinet many inspectors dont think NM under a cabinet is subject to be damaged if run up out of the way, so it will depend upon your inspector, how many hard wire disposals have just NM going to them?, but when you use the LB and conduit through the brick as a sleeve you have to secure the NM within 6" of it exiting and provide a bushing to prevent any damage to the cable, also how are you going to provide a disconnect for the TWH? lockable breaker is one way?

I planned on using a non-fused pull out. It's kind of crowded under the sink though. I thought about just putting the disc. inside the first cabinet then running through the other cabinets to the TWH.

 

[220/221]

Of course NM can be run thru brick without a sleeve.

I would sleeve it under the cabinet though. It's too simple not to do it. People shove all kinds of crap under cabinets. It takes maybe a minute to slip some protection over it. Don't forget the disco or lockout.