300.7 (a)

[stjohnbarleycorn]

Doesn't this cover all underground installations, and leaving conditioned spaces to the outside. I don't think I have seen anyone doing this,
and if you did is silicone what you would use?

300.7 Raceways Exposed to Different Temperatures.
(A) Sealing. Where portions of a cable raceway or sleeve are known to be subjected to different temperatures and where condensation is known to be a problem, as in cold storage areas of buildings or where passing from the interior to the exterior of a building, the raceway or sleeve shall be filled with an approved material to prevent the circulation of warm air to a colder section of the raceway or sleeve. An explosionproof seal shall not be required for this purpose.

 

[raider1]

I have seen silicone or duct seal used for this purpose.

Chris

 

[John25]

I have used fiberglass insulation and duct seal.

 

[infinity]

Duct seal. Silicone can be a real mess and will be almost impossible to remove later on.

 

[cowboyjwc]

I have seen silicone or duct seal used for this purpose.

Chris

I'm with Chris.

It's also talking about things such as cooler boxes where you have a switch on the outside of the door and the light on the inside.