electrical wiring with in walk in freezers

[draco]

Iam looking for some information as to the proper wiring methods used inside a walk in freezer and cooler.

 

[milwaukeesteve]

Re: electrical wiring with in walk in freezers

You want to keep your wiring methods focused on vaportight. You don't water dripping on it, so your not raintight, but you do have condensation and temperature changes to worry about.
Where I am at, they leave the doors open during loading and unloading (long time). During the summer days, the moisture that comes in then collects in the incandescent fixtures. Sometimes putting the bulbs in water.
We have to make sure the seals on the gaskets are good. Because of vapor and condensation.

 

[draco]

Re: electrical wiring with in walk in freezers

Thank you for the info. I thought it should vapor tight. This freezer is about 60'x 60'x 20' tall. it has 400 watt hi bays in it with the typical door heaters, exits, emgergency lites etc. I live in arizona when a door opens it is hot! I asked two different inspectors about the methods, one said every thing normal wiring, the other said vapor tite but I could use aluminum flex, go figure.

 

[iwire]

Re: electrical wiring with in walk in freezers

This freezer is about 60'x 60'x 20'

The wiring inside this large space can be the same as wiring in any warehouse the only NEC consideration is 300.7

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.

As long as you seal each and every raceway that penetrates the freezer walls you will be all set.

Condensation will not form in raceways that do not leave the freezer space.

Recently I wired some pre fab walk in freezers and the factory wiring method was all standard flexible conduit.