Another term found on the nameplate is Minimum Supply Circuit Ampacity. This value is required to select minimum branch-circuit conductor size and switch ratings for the HVAC unit. To determine the minimum supply circuit ampacity on the nameplate, the manufacturer will use the formula of (RLA x 1.25) + Other Loads.Click to see full answer. People also ask, how do you find the minimum ampacity of a circuit? How to Calculate Minimum Circuit Ampacity Locate the name plate of the product to be wired. Find the full load amps (FLA) of the unit’s largest motor. Find the FLA of all smaller motors or heaters. Add the FLA of all the motors together. Multiply the sum of the motor FLA ratings by 1.25. Additionally, how is MOCP calculated? How to Calculate MOCP Determine whether the electric heater has field-installed electric heat or has single point power (contains electric heat). Multiply the full load amps of the indoor fan motor by 400 percent for a single-point power unit. Add the resulting number to the full amp loads of the heater. Accordingly, what size breaker do I need for my air conditioner? 4 Answers. It’s going to completely depend on the unit that’s being installed, but commonly it’ll be 30-60 amp with 10-4 AWG wire. You’re probably looking at a 3.5 ton unit, so you’ll be in the 30-40A (10-8 AWG) range. It might be worth it to get a few quotes from local HVAC companies, and see what they want to installWhat type of circuit breaker is recommended for HVAC equipment?according to the manufacturer’s identification label, a 35 amp circuit breaker (see pictures) should be installed in the electric service panel for the air conditioner compressor unit. The circuit breaker in the electric panel attached to the air conditioner compressor appeared to be a 30 amp circuit breaker.

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