Most of the recessed lighting fixtures I see in stores have a metal junction box separate from the can. There is an armored cable running from the junction box to the can already. You connect your NMD90 wire to the junction box. Makes sense.
However, I have two of these recessed lighting fixtures. They have a junction box attached to the top of the can itself.
The junction box itself says I have to use wire rated to 90C, which NMD90 wire would be. My question is, do I have to use metal clad (MC) wire from the power source to this light, or can I just use NMD90?
The back of the junction box says:
MAXIMUM OF 8 NO. 12 AWG THROUGH BRANCH CIRCUIT CONDUCTORS SUITABLE FOR AT LEAST 90 C PERMITTED IN A BOX (4 IN 4 OUT) FOR FLEXIBLE CONDUIT ONLY
I'm not sure what that last line means: "for flexible conduit only".