Spray foaming load center in exterior wall

[BarryO]

I would read the spray foam instructions and warning very carefully. Some of these compounds can attack certain types of plastics. Not sure about the NM jacketing.

Apparently there's also a concern about the high temperatures reached by the foam while curing. A thread from earlier this year: https://forums.mikeholt.com/threads/update-on-romex-in-spray-foam-insulation.2578873/

 

[LarryFine]

Aren't NM cables in exterior walls routinely placed within insulation? With 90 degree conductors rated at 60 degree ampacity, it shouldn't be a problem.

Which I believe is why NM stubbornly hangs onto that 60 deg rating.

 

[kwired]

As a HO, I would want at least one open raceway to that panel.

Other than that, foam all you want.

As one that potentially may be adding something someday I want at least one open raceway

 

[acin]

I would read the spray foam instructions and warning very carefully. Some of these compounds can attack certain types of plastics. Not sure about the NM jacketing.

Also 334.80

 

[electrofelon]

I would read the spray foam instructions and warning very carefully. Some of these compounds can attack certain types of plastics. Not sure about the NM jacketing.

If there is an issue with spray foam and pex, PVC, or NM or SE sheath, then just about every home built here in the northeast in the last 20 years is in trouble

 

[kwired]

Some of these compounds can attack certain types of plastics.

Probably is temporary until the product has cured.

 

[BarryO]

Which I believe is why NM stubbornly hangs onto that 60 deg rating.

Yep, it covers for a lot of installation sketchiness in this most-used residential wiring method.