Commercial Freezer

[nizak]

Does wiring located on the top of a commercial cooler/ freezer unit have to adhere to the the same requirements as a building roof top?

Thanks

 

[Rick 0920]

Wiring on a rooftop deals with ambient temperature. I think you have to consider the ambient whether you are indoors or outdoors, so I would say yes. We always have to take into consideration the worst possible heat condition the conductor will encounter.

 

[nizak]

Thanks. The way I’m interpreting the code is that if the conduit is at least 7/8” off the deck no adjustment needs to made for temp.

Am I incorrect?

 

[Rick 0920]

That's what I see. I do not see anywhere that says you have to 7/8" above your equipment that is installed ON the roof. It says 7/8" above the roof.
If you are installing your conduit on a piece of equipment that is installed on the roof, you don't need the temperature adder, just figure the ambient.