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Chapter 12 Helpful information
3 Phase Systems
Background
For a three Phase AC Power system it has:
•
Three power lines that are 120° out of phase with each other
•
If loads are balanced across phases, then the neutral current is zero
•
Two types in Delta or Wye circuit configurations
•
Delta configuration lacks a neutral
•
Wiring Colour Codes
NEC for US and Canada
Wire function
Phase 1 or Line 1
Phase 2 or Line 2
Phase 3 or Line 3
Neutral
Earth Ground
6U Rack or Tower UPS RT8kVA and RT11kVA IUOMG
Wire Colour
Black
Red
Blue
White
Green
Grey
Yellow
IEC for Europe
Wire Colour
Grey
Black
Brown
Blue
Green
Yellow
215
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