⚡ Electrical Load Analysis
Circuit Load Calculator
Calculate how many lighting fixtures fit safely on a branch circuit. Checks NEC 80% continuous load rule, shows remaining capacity, and tells you exactly how many more fixtures you can add.
NEC 210.19(A) — Continuous Load Rule: Lighting is classified as a continuous load (operating 3+ hours). Branch circuits must not exceed 80% of rated ampacity for continuous loads. A 20A breaker has a continuous limit of 16A.
Quick setup
Breaker Size (A)
Circuit Voltage (V)
Load Type
Lighting is always continuous per NEC
Quick add fixture
Fixtures on this circuit
2 fixtures
Fixture name
Type / preset
Watts each
Qty
Total W
—%
Circuit capacity usedof continuous limit
—
80% limit
0%20%40%60%80%100%
Total Wattage
—
watts
Total Amperage
—
amps drawn
Remaining Capacity
—
watts available
Breaker Status
—
—
NEC 80% continuous load rule — your circuit
Breaker rated capacity
—
Maximum theoretical
Continuous load limit (80%)
—
NEC 210.19(A) maximum
—
Load breakdown by fixture
| Fixture | Qty | Each | Total | % of circuit |
|---|
How many more fixtures can you add?
Based on your remaining circuit capacity: