277 Volt

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120 vs 277 Volt

277V is the preferred input power for most non-residential applications. This is because high voltage lighting produces better efficacy and less current, which in turn means less power is lost due to resistance. As a result, more lighting fixtures can be put onto a circuit because there is less of a concern focused on voltage drop. Higher voltage lights are suited to areas with many fixtures installed close together, like warehouses, retail spaces, schools, medical facilities, hotels, restaurants – you get the idea.

Many commercial and industrial facilities receive their power on a 480/277V, 3 phase, 4 wire system. 277V is the phase-to-neutral stage for 480V phase-to-phase. While large industrial equipment generally uses 480V wiring, industrial-scale lighting utilizes 277V wiring to operate. Industrial-type facilities like higher voltage bulbs like 277V because a transformer is not needed to operate them, and as such you will often see 480/277 voltages together. In turn, 277V light bulbs are then used in these facilities given the significant reduction of costs on energy and construction.

Check our blog on 277V lighting here!

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