Multiple HVAC overcurrent protection

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wfalicki

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Location
usa
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substation engineer
There's a question I've gotten varying answers on, I'm a little new to this sort of thing so I was wondering if anyone could ease my anxiety on it.
There's three air conditioners wired in parallel to each other protected by three 100A fuses.

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We were supposed to replace the fuses with a breaker and leave the wiring in place, so I took (compressor load+fans)*3*1.75 per nec 440.22 which results in 111 amps. So I sized the breaker at 100 amps. Is that the right approach?
 
Note that you have single phase units with the load distributed on a 3 phase supply. The 100 amp feeder protection is likely adequate.
 
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