ECN Forum Forums General Topics of the Trade Non-US Electrical Systems & Trades Air Con/HVAC systems

Sparky,
We always size the feeder and OCPD by the max. fuse/breaker rating on the nameplate. That insures plenty of ampacity for startup.

Where it gets more difficult is on remodels where older HVAC units without the nameplate info are being reused. Then it often becomes a guessing game.

GJ