I have a customer who thinks they have an electrical issue. The AC is tripping, they also have a single pole 15 amp AFCI the nuisance trips. I went over there put a hair dryer and at a different time a vacuum load on the 15 amp breaker and took voltage measurements everything was reading 123.5-124 volts A to neutral and B to Neutral. Line to line was 246-247. I couldn’t get it to trip. I made sure connections were tight. So far it hasn’t tripped again. House built in 2014 I told them the older afci breakers nuisance trip and if it does it again I’ll swap it out for a newer one. Hasn’t tripped in 2 weeks.
The house is 4300 square feet and has 1-5tonn unit that keeps tripping the breaker. It’s on a 2-pole 50, which name plate says is max. Minimum circuit amps is 32.5 amps. Wire is 6awg AL. I checked connections and everything was tight. I told them the unit is too small for the house. It tripped again today 90+ degrees outside.
Is there anything else I can/should check out before I send them to the HVAC guy?
