Chiller Changeout

[jsutton]

Hello All
The old chiller is fed with a 400a breaker and 300 MCM thhn copper. The new chiller has a 243 MCA and a 250 MOP.
If the new chiller has a unit mounted 250a breaker, does the 400a breaker at the panelboard need to be changed to 250 amps?

Thanks in advance

 

[jsutton]

I'm seeing it as you must change the breaker in the panelboard due to 240.21. I don't see anything in 440 that says the location can be changed from the beginning of the circuit.

 

[jap]

It sounds like they were pretty skimpy on the original 400a Feeder but I would say the existing conductors meet the MCA's and the 250a breaker covers the MOP.


JAP>

 

[jsutton]

My concern is with the location of the 250 amp breaker.

 

[david luchini]

You would need to change the 400A c/b to 300A.

 

[jsutton]

Thanks

 

[kwired]

If you can comply with any of the feeder tap rules it may be acceptable.

Outdoor taps can be unlimited in length.

 

[infinity]

If you can comply with any of the feeder tap rules it may be acceptable.

Outdoor taps can be unlimited in length.

Good point.