Power Distro Per-Leg Loading
Current per leg, percent of service rating, headroom.
Example
You enter
- Total connected load (W) 12000
- Service voltage (V, line-line for 3-phase) 208
- Phase three
- Service rating (A per leg) 60
- Power factor 1
- Continuous-derate target 0.8
You get
- Current per leg 33.31
- Pct load 55.5
Details, formula, and sources
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.
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.
NFPA 70 free read-only at nfpa.org/freeaccess; a qualified electrician and the AHJ govern temporary power.
Estimate. AHJ and licensed electrician govern. Verify against the NEC edition adopted in your jurisdiction.
Field names used by the API: watts, voltage_v, phase, rating_a, pf, derate, amps_per_leg, pct_load
- Balanced legs per-leg current assumes a balanced load unless per-phase watts are enteredAC power