Power Distro Per-Leg Loading
Current per leg, percent of service rating, headroom, and a pass/fail against the 80% continuous limit for stage/event temporary power, 1-phase or 3-phase.
Formula and source
1-phase I = W/(V*PF); 3-phase I = W/(sqrt(3)*V_LL*PF); %load = I/rating*100; continuous limit = rating*0.80.
First-principles AC power (P = V*I*PF; 3-phase adds sqrt(3)); the NEC continuous-load 80% rule and temporary-power Articles 520/525, by name.
Audience
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