Introduction to US Standard 3-Phase Commercial Voltages

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Master Electrician Teaches his Son the Basics of 480-277 Volt Vs. 120-208 Volt Systems, Thoughts?

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What happens here

The video begins by introducing the standard 3-phase commercial electrical voltage in the United States, which is 480/277 Volts. The master electrician explains this system, which typically involves four wires: brown, orange, and yellow for the three phases, and a gray wire for the neutral connection. This system is prevalent in most commercial facilities.

Goal: Familiarize with the standard 3-phase commercial voltage and wire color coding.

Tools and materials

Electrical Panel — Illustration of where these voltages are distributed from
Electrical Wires — Illustration of brown, orange, yellow phases, and gray neutral

What they say

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The majority in the United States, the standard is 480 volt four wire system. >> Okay. >> Brown, orange, yellow, gray. Yeah. Right. Then what happens? You cannot use 277 volt for a standard receptacle. What do we need to do? We need to put in a deltay dry type transformer throughout the facility where needed. Oh, we're going to tap off the 480 volt with a

Auto-generated from the video audio.