Government of the Republic of Trinidad and Tobago

New Electrical Wiring Colour Code

The Trinidad and Tobago Electrical Wiring Code specifies the colour code that is used for the identification of conductors in electrical installations throughout the country.  A new colour code is being implemented because the electrical cables on the local and international market no longer met the old colour coding requirements of TTS 171: Part 1: 2002.  It was necessary to implement a new colour code which would facilitate the safe application of the electrical cables sold in and imported into Trinidad and Tobago.

What is affected by this new colour code?

The new colour code impacts:

  • New single-phase installations.
  • Extensions or alterations to existing single-phase installations.
  • New three-phase installations.
  • Extensions or alterations to existing three-phase installations.

Please follow the link below for summary information about the new colour code and for illustrative diagrams of the changes.  You may also view the Amendment 1 (2007) of the Trinidad and Tobago Electrical Wiring Code: Part 1: Low voltage Installations (TTS 171: Part 1: 2002) in its entirety.

Summary of New Electrical Wiring Colour Code

Amendment 1 (2007) to the Trinidad and Tobago Electrical Wiring Code

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When does the new colour code take effect?

All electrical wiring work that commences on or after January 1, 2008 must comply with the new colour code.  There is a transition period from July 1, 2007 through December 31, 2007 during which installations must use the old colours or the new colours, but not both.

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Where can I find more information?

More information about the new electrical colour code can be obtained by contacting:


Ministry of Public Utilities
2 Elizabeth Street
St. Clair
Port of Spain
Telephone: (868) 628-9500
Fax: (868) 628-6067
Opening Hours: Monday to Friday, 8 am to 4 pm, except public holidays


Electrical Inspectorate Division
Corner Eastern Main Road and Cochrane Street
Tunapuna, Trinidad
Tel: 645-6773
Tel/Fax: 645-6997


Electrical Inspectorate Division
11 Independence Avenue
San Fernando, Trinidad
Tel/Fax: 652-0646


The Trinidad and Tobago Bureau of Standards
1-2 Century Drive
Trincity Industrial Estate
Tunapuna, Trinidad
Tel: 662-8827
Fax: 663-4335

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