---
title: "Xingguang | 277 V or 480 V: which North American supply"
description: "North American commercial ceiling lighting usually runs 277 V, taken phase-to-neutral off a 480 V three-phase supply; 480 V proper is for industrial plants. So one fixture exists in both a 277 V and a 480 V version over there, and shipping the wrong one means the whole batch is reworked on site."
url: "https://www.xingguanglightingcn.com/en/spec/277v-480v-north-america"
lang: "en"
updated: "2026-10-28"
markdown: "https://www.xingguanglightingcn.com/en/spec/277v-480v-north-america.md"
---

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# 277 V or 480 V: which North American supply

North American commercial ceiling lighting usually runs 277 V, taken phase-to-neutral off a 480 V three-phase supply; 480 V proper is for industrial plants. So one fixture exists in both a 277 V and a 480 V version over there, and shipping the wrong one means the whole batch is reworked on site. The way to settle it is a photo of the panel and the breaker rating, not the words North American voltage. Canada adds 347 V, which is equally unsafe to assume.

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## Key parameters

| Power | 100–240 W |
| --- | --- |
| Luminous flux | 13,000–31,000 lm |
| Mounting height | 6–10 m |
| IP rating | IP65 |
| Input voltage | 120–277 V single phase / 480 V three phase |
| Frequency | 60 Hz |
| Allowed voltage drop | ≤ 3% end to end |

[Product family: High Bay Lights](https://www.xingguanglightingcn.com/en/product-categories/high-bay)

## Voltage is the item most often skipped

This page is 120–277 V single phase / 480 V three phase at 60 Hz. [Wide-range input](https://www.xingguanglightingcn.com/en/glossary#wide-voltage) is not about "works anywhere" — it is about not derating or tripping when the supply sits low or high. In regions with unstable grids, narrow-range drivers fail noticeably more often.

The other thing that gets skipped is inrush: when high-power fixtures start together the inrush adds up and trips the breaker. Where twenty units switch on at once, size the breaker on the row, not on one fixture — undersize it and the symptom is "it trips the moment you switch on", which few people trace back to the lights.

## Voltage drop: right voltage, still dim

Allowed drop on this page is ≤ 3% end to end. It shows up worst on low-voltage and DC systems: a 24 V run of 30 m on 2.5 mm² can lose more than 10% by the far end, the fixtures visibly dimmer and the furthest ones dimmest. On site that looks like a faulty fixture; it is an undersized cable.

On the AC side the working figure is to keep total drop under 3%. That is a wiring parameter, not a fixture parameter — but it decides what the customer sees, so size the cable during the quote, not during commissioning when the lights get blamed.

## Four things to verify before ordering

① Whether flux and [efficacy](https://www.xingguanglightingcn.com/en/glossary#efficacy) are quoted for the complete fixture or the light source — a 10–15% difference that changes the fixture count. ② Whether [colour temperature](https://www.xingguanglightingcn.com/en/glossary#cct) and CRI are measured or nominal values; mixed CCT within one batch is the most common arrival dispute. ③ Driver brand and model, plus its derating curve at high temperature — it is the only part that really sets life. ④ The mounting kit list: chain, bracket and anchors in the box, or the site stops for a day.

## Concepts on this page

[High bay](https://www.xingguanglightingcn.com/en/glossary#high-bay)[Ambient temperature rating](https://www.xingguanglightingcn.com/en/glossary#ta-rating)[Luminous efficacy](https://www.xingguanglightingcn.com/en/glossary#efficacy)

![UFO High Bay UFO-060](https://www.xingguanglightingcn.com/assets/img/prod-ufo060.webp)

### [UFO High Bay UFO-060](https://www.xingguanglightingcn.com/en/products/high-bay-light-ufo060)

100W

## Need a Lighting Plan?

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[All specification pages](https://www.xingguanglightingcn.com/en/spec/)