---
title: "What Is 480Y/277V Electrical Service? | Calibre Glossary"
description: "A 480Y/277V service is a three-phase, four-wire wye system with 480 volts between phases and 277 volts from any phase to neutral, common in larger."
url: https://calibre.multisites.ai/glossary/480y-277v-electrical-service
publisher: Calibre Commercial Inspections
phone: "+1-208-305-6245"
email: Schedule@CalibreCBI.com
---

Building systems

# 480Y/277V Electrical Service

A 480Y/277V service is a three-phase, four-wire wye system with 480 volts between phases and 277 volts from any phase to neutral, common in larger commercial and industrial buildings.

## Why it matters

The 277-volt side often powers lighting, while 480 volts runs larger motors and HVAC equipment. Small tenants may need transformers to get 120-volt power. Equipment capacity, age and available spare capacity affect leasing and expansion plans.

Source: [c03.apogee.net](https://c03.apogee.net/mvc/home/hes/land/el?utilityname=peco&spc=cel&id=1439)

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