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	Subject - Interruptible service for AC deadshort What general practice is used for interruptible residential service panel controlling two ac units (2.5hp and 1.5 hp)? Must the service panel have a SINGLE main breaker to disconnect service, or will a service panel with two separate breakers (30 A and 40 A) suffice? sijagur I recomend to install circuit breaker for each AC unit, and a main switch at main feeder entering the panel, in order to make the panel can be switched off locally for maintenance. About the size of ciruit breakers, can you tell me about voltage rating? (may be we have different voltage rating) lctrc789 Using two seperate breakers for each unit and a main breaker would be the way to go. What voltage and what amperage or wattage size are they A/C units, or what size BTU or rating? Rodney I noticed at my brothers house the hvac guy ran the feeder wires to the ac disconnect directly off of the 100A main breaker. Does that fall under the 25 ft tap rule? Can someone explain to me in english about taps. I was always under the impression that the wire size had to match up with the breaker size, ie. no smaller that #10 on a 30A breaker. Enlighten me! Electricman Rodney, There are exceptions to that rule, and HVAC equiptment falls under them. It is possible to have 12 awg conductors fused by a 30 amp fuse on AC units. There is another thread on this forum that explains it, I believe it is entilted Overcurrent vs Overload it is very informative and authored by one of this sites most knowlegeable contributers.