air conditioner

[mickeyrench]

i have a rtu that has a mca of 124 amps. with a mocp of 150 amps. i plan on using a cb rated for 150 amps. my conductors will be 2/0 only because the distance to the rtu is 130' and to be safe. we will use a 200 amp. non fused disconnect @ the unit. all in 2" conduit. this is a 3 phase 240 volt . if i missed something and i usally do can some one point it out before we get started.
thanks again.

 

[Dave_PE]

Almost looks good to me.....I would use a fused disconnect switch, unless you know that the available fault current is less then 10K.

 

[LarryFine]

I would use a fused disconnect switch, unless you know that the available fault current is less then 10K.

It should be lower with the run that long, and the fuses would only be (otherwise) necessary if called for by the equipment.

 

[fido]

Sometimes those fused disconnects plus fuses are cheaper than the non-fused disconnect.
Paul

 

[jamesguy10]

Yeah the fused are cheaper around here.

 

[LarryFine]

Even including the cost of three 150a fuses?

 

[brian john]

3 phase 240 volt [/quote}

Just out of curiosity, this is a Delta system at 240 VAC?

 

[mickeyrench]

brian john, yes it is 3 phase 240v with a red leg. do you see any problems?or have any suggestions?

 

[mickeyrench]

i ,m just reading on the paper work that on 3 phase units the voltages have to be balanced by no more than 2%. i think i have problems.