ECN Forum Forums General Topics of the Trade General Discussion Area Upgrading 3 Phase system

2 pole 240v arc welder 30amp

3 phase 240v air compressor 50amp

3 phase 240v sub panel 60amp
The equipment from the
subpanel is feeding a
paint booth and uses
approximately 23amps




What about the loads from lighting & heat / cooling & ventilation & receptacles (microwave, etc)?

What you have adds up to 163A.... In Canada, If I am not mistaken, the service in a garage must be rated at least 100% (not 80%) of all loads

Also, what if they want to add equipment in the future?

A 150A panel should be the same price as a 200A panel...