Walk in freezer

[selectrician]

What nema rating is required for disconnects installed on the fans in a walk in freezer?:?

 

[iwire]

That is a funny question, what I find in this area is people use NEMA 4 or at least NEMA 3R wiring methods when the fan unit itself is clearly NEMA 1.

In my opinion NEMA 1 is all that is required and will often last better than bell boxes with switches.

 

[selectrician]

SELECTRICIAN

SELECTRICIAN

That is the way I looked at it as well , but the inspector is not sure.

 

[augie47]

I'm curious as to how you (and others) handle the disconnecting of power to walk-in freezer evaporator units.
Locally, coolers normally have fans that are supplied by a 120v independent circuit and E/Cs put SP switches at the evaporators in sight of the fan.
Freezers on the other hand, normally have a multi-conductor connection to the condenser which often has a defrost timer,etc. with some conductors serving dual purposes.
To disconnect power to the evaporator unit would require opening 6 circuits. Consequently common practice has been to allow the condenser disconnect to be the only one.

 

[jeremysterling]

I'm curious as to how you (and others) handle the disconnecting of power to walk-in freezer evaporator units.

The evap unit disconnect discussion at a recent job ranged from NEMA 1 all the way to IEC IP67. As it turned out, it was decided

to allow the condenser disconnect to be the only one.

 

[selectrician]

The inspector said fans needed disconnects and the defrost circuits did not.:blink: