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Old Cable Colour System
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The cable colour code traditionally used for fixed electrical installations in Hong Kong as specified in the Code of Practice for the Electricity (Wiring) Regulations is shown below:

Systems
Phase (or line)
Neutral
Earth
1-phase system
red
(or yellow or white or blue )
black
green / yellow
3-phase system
L1
L2
L3
black
green / yellow
red
yellow or white
blue
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Copyright © 2008 by Electrical and Mechanical Services Department, HKSARG