MC to NM SPLICE?

[darkov]

OK, I need your opinions/help. Today I've seen something unusual that I haven't seen before. It is a restaurant, type V construction (very old building), two story building, but both floors are same tenant/restaurant.
There is a mixture of wiring, who knows how old, and electrician on this job is splicing MC cable and NM (romex) cable. Basically, he is continuing run of MC cable with NM. Some of wiring will be concealed above gyp. board ceiling (no access hole), and some will be above grid tile ceiling which is not approved for romex location.
My question is: Can he splice or continue a run of MC cable with NM cable :?
If not, I'd like to know code section. Only thing that I can think of it is terminal rating of devices and NM couldn't be OK for 75 deg. :huh:

Thanks.

 

[peter d]

As long as it's being done in a proper enclosure with proper connectors, I don't see the issue. Now, if it's a flying splice, that's another matter entirely.

 

[mopowr steve]

It is possible that he's ok.
If he is using the mc cable in the areas that have the drop grid ceiling and then nm-b in the concealed gypsum board ceiling.
As the nm-b is not code compliant above grid ceiling in commercial applications.

 

[mopowr steve]

My question is: Can he splice or continue a run of MC cable with NM cable :?
If not, I'd like to know code section. Only thing that I can think of it is terminal rating of devices and NM couldn't be OK for 75 deg. :huh:

Thanks.

I believe nm-b has 90* conductors just as THHN would have. You may be thinking of the derating temperature as it pertains to its install. For example in dwelling units you use the 60* column.

otherwise we wouldn't be able to use it to connect to light fixtures that typically state "connect to 90* rated conductors minimum"