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

Let me try my math with your numbers.

Largest load air compressor 50 amps x 1.25 = 62.5
Welder 30 amps
Paint booth 23 amps
RTU 42 amps
Total 157.5 amps

I don't believe you can derate the other loads.