Exhaust hood wiring

[sands35]

I am installing an exhaust hood with a remote blower. There is a 6 wire harness between the blower and the hood.

1 ground
1 neutral
4 power (one for each speed)

I need to provide the wires between the hood and the blower. The blower has a junction box and the hood has a provided harness connection where I'll need to nut onto the romex inside a box.

I was going to use 2 separate NM wires. One 14-2 and One 14-3. The wires will be enclosed behind drywall and and sheetmetal.

Do I need to put it into flex conduit? My fallback was to use smurf tube.

Rather than buying THHN, can I strip the romex sheath off the wires and then put them into the conduit?

 

[Norcal]

I am installing an exhaust hood with a remote blower. There is a 6 wire harness between the blower and the hood.

1 ground
1 neutral
4 power (one for each speed)

I need to provide the wires between the hood and the blower. The blower has a junction box and the hood has a provided harness connection where I'll need to nut onto the romex inside a box.

I was going to use 2 separate NM wires. One 14-2 and One 14-3. The wires will be enclosed behind drywall and and sheetmetal.

Do I need to put it into flex conduit? My fallback was to use smurf tube.

Rather than buying THHN, can I strip the romex sheath off the wires and then put them into the conduit?

Use flex, & the conductors from NM cable cannot be used outside of the sheathing they become scrap metal if stripped out, as the conductors are not marked.

 

[sands35]

OK - thanks.

Looks like one 14-2 and one 14-3 will exceed fill for a 3/4" flex. I need some THWN anyway....

Am I *required* to use flex? I can get everything buried behind drywall so there isn't an issue with inadvertent contact.

 

[VHF]

You need some kind of conduit, flex or otherwise. You are not permitted to run THHN/THWN wires in the wall by themselves. Smurf tube should be OK.