Breaker Selection for Roof Top units
Breaker Selection for Roof Top units
(OP)
MOCP=50
FLA=47
Can somebody tell me the procedure to select the breaker for above Roof Top AC unit. I am doing a project in Canada and bit confused with their code. The code is same as NEC but they do it differently.
If I did it accori8dng to NEC I would go with the 110A breaker with 50A trip setting and feeder for 50A. But my Canadian counter parts select the 50A breaker and feeder for 50A. Can this be right?
FLA=47
Can somebody tell me the procedure to select the breaker for above Roof Top AC unit. I am doing a project in Canada and bit confused with their code. The code is same as NEC but they do it differently.
If I did it accori8dng to NEC I would go with the 110A breaker with 50A trip setting and feeder for 50A. But my Canadian counter parts select the 50A breaker and feeder for 50A. Can this be right?





RE: Breaker Selection for Roof Top units
I have no idea what so ever what you could mean by 110A breaker with 50A trip. I've never seen a 110A breaker that could have a 50A trip.
RE: Breaker Selection for Roof Top units
RE: Breaker Selection for Roof Top units
50 seems low even for Maximum Over Load Protection.
Possibly the MOCP=50 should be MOCP=150 or 250.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Breaker Selection for Roof Top units
On the face value, your Canadian counterpart is correct.
If you really want to calculate you need to list the components and their rating in the unit, such as motors, heaters, fans, etc and need to know what components are likely to run simultaneously.
Rafiq Bulsara
http://www.srengineersct.com
RE: Breaker Selection for Roof Top units