breaker sizing

[rose1981]

Attached is the cut sheet for RTU. MCB is 25Amps. Should I go with 25amps breaker or should I size? Can someone please tell me how to do the calculation for breaker sizing for this particular equip?

 

[qcroanoke]

Attached is the cut sheet for RTU. MCB is 25Amps. Should I go with 25amps breaker or should I size? Can someone please tell me how to do the calculation for breaker sizing for this particular equip?

25 amp breaker is as large as you can go by nameplate, therefore as large as you can go by code.
all the calculations have been done.
I would run #12 and put it on a 25 amp breaker.
I just noticed it has an 18kw heater. Is that another circuit that's required? If not 35 amp is your maximum

 

[augie47]

25 amp breaker is as large as you can go by nameplate, therefore as large as you can go by code.
all the calculations have been done.
I would run #12 and put it on a 25 amp breaker.
I just noticed it has an 18kw heater. Is that another circuit that's required? If not 35 amp is your maximum

IN agreement with one unlikely caution. Bring an RTU I doubt you are running NM, but in case you are and if you are under the '14 Code, I think the 60° rating on #12 in now 20 amps so #12 NM under the '14 would not be allowed for your 21.6 load.

 

[qcroanoke]

IN agreement with one unlikely caution. Bring an RTU I doubt you are running NM, but in case you are and if you are under the '14 Code, I think the 60° rating on #12 in now 20 amps so #12 NM under the '14 would not be allowed for your 21.6 load.

Wow Gus, I wasn't aware that NM fell under the temperature limits too. Thanks. I would have made that mistake.