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Basic Electrical Materials and Methods cont'd
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Design Considerations - index
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Basic Electrical Materials and Methods cont'd


DOE-HDBK-1132-99
Color coding for 208Y/120V three-phase systems
Phase " "Ungrounded conductor
A
Black
Phase " "Ungrounded conductor
B
Red
Phase " "Ungrounded conductor
C
Blue
Color coding for 480Y/277V three-phase systems
Phase " "Ungrounded conductor
A
Brown
Phase " "Ungrounded conductor
B
Orange
Phase " "Ungrounded conductor
C
Yellow
Color coding for 480V corner-grounded (B-Phase) Delta three-phase systems
Phase " "Ungrounded Conductor
A
Brown
Phase " "Grounded Conductor
B
Gray
Phase " "Ungrounded Conductor
C
Yellow
Branch circuits for 120V lighting and receptacles are recommended to be two-
wire circuits with a separate ground wire. Use of common neutral conductors for
several branch circuits is not a good practice.
When cable trays are used, the following guidelines should be considered for
design/installation:
Use cable trays for large, multiple-cable applications in both interior and
exterior locations.
Arrange cable tray runs in stacks by descending voltage levels with the
highest voltage at the top.
Consider the minimum bending radius of all medium-voltage cables to be
routed through the tray system during the selection of the cable tray
bending radius (horizontal and vertical).
II-26


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