Circuit breaker (in LED wall sizing)

The protective device whose rating caps how many cabinets one power feed can carry.

A circuit's capacity is its voltage times its breaker rating: 230 V × 16 A ≈ 3,680 W. For continuous loads like displays, the working limit is 80% of that (~2,940 W), a rule codified in NEC 210.19 and mirrored in European practice.

Divide the usable watts by a cabinet's maximum power to get cabinets per circuit — the number wikiLED's power wiring view computes and draws for you.