[dblade]

I'm working on renovating a basement room and trying to find an answer for this.

Scenario is standard 2x4 walls that will be cavity filled with 2lb spray foam. While technically the foam can be sprayed directly on the wires (though the device boxes have to be sealed to keep foam out) I REALLY would prefer to have them in conduit. That said, can I have 2 pieces of NMD90 14/2 in a 3/4" piece of EMT (about 6' total length) to keep the foam off of it? (1 down to the box, other up to run to the next box.)

And yes, the work will all be inspected (have the building permit already and will have an electrician double check my work and have the ESA out to inspect), just trying to keep labour costs down.

 

[joed]

here are some rules that will apply to a not complete system used only for protection.

12-1014 Conductors in conduit (see Appendix B)
(1) Conduits shall be of sufficient size to permit the conductors to be drawn in and withdrawn without injury to the conductors.

You can't use PVC.

12-1102 Restrictions on use
Rigid PVC conduit shall not be used where enclosed in thermal insulation.

 

[carmusic]

id say yes, it is only a sleeve

 

[dougmedic]

That said, can I have 2 pieces of NMD90 14/2 in a 3/4" piece of EMT (about 6' total length) to keep the foam off of it? (1 down to the box, other up to run to the next box.)

Short answer is "No". Below are reason given by my local AHJ, which also match what I was taught back in code class.
HOWEVER interpretation is up to your local AHJ (Authority Having Jurisdiction). So check with ESA

1. This situation isn't "open wiring", or a short length requiring "mechanical protection so you cant even try to apply 12-910. This is "concealed wiring", and must be treated as such. All rules for conductor type (etc) apply.
2. Running EMT/Conduit between enclosures (device boxes, junction boxes, etc) is a part of a "complete system", and rules for support, termination, conductor-type, etc. apply

3. CEC Rules:
CEC 2015, Rule 12-111 Refers you to Table 19 for suitability regarding (d) enclosure, (e) mechanical protection. AND
Rule 12-910(2) dose NOT override 12-111, or 12-1902(1). It only applies to subrules (3)(4)(5) of 12-910.
Rule 12-1902(1) refers to Table 19, which does not allow NMSC to be in EMT
Rule 12-3022(3) requires clamp to secure the cable, either integral to the box connector or as part of/attached to the enclosure. Standard EMT box connectors have no clamp, and will not fit in device boxes that have an integral clamp.

As I wrote above, your local AHJ may interpret thing differently, or have variances. Check with ESA, and don't take my (or anyone elses!) word as gospel.

Regards,
Douglas
(who's learned the hard way at times...)

 

[joed]

2. Running EMT/Conduit between enclosures (device boxes, junction boxes, etc) is a part of a "complete system", and rules for support, termination, conductor-type, etc. apply

But if you only have a box at the bottom and open conduit at the top it is not a complete system.

If you are going to put a box at the top then use separate conductors not NMD cable down to the receptacle. You also don't need go to down and back up. You can make the connections in the upper box and just go down.

If it was me I would just run the NMD and foam it. What is your reason for not wanting to foam the NMD?