WORLD TRADE  
ORGANIZATION  G/TBT/N/TTO/31 
1 April 2008 
 (08-1422) 
Committee on Technical Barriers to Trade Original:   English 
  
 
NOTIFICATION 
 
The following notification is being circ ulated in accordance with Article 10.6. 
 
1. Member to Agreement notifying:   TRINIDAD AND TOBAGO
 
If applicable, name of local government involved (Articles 3.2 and 7.2):         
2. Agency responsible:   Trinidad and Tobago Bureau of Standards 
Name and address (including telephone and fax numbers, e-mail and web-site 
addresses, if available) of  agency or authority designated to handle comments 
regarding the notification shall be  indicated if different from above:         
3. Notified under Article 2.9.2 [  X ], 2.10.1 [   ], 5.6.2 [   ], 5.7.1 [   ], other:         
4. Products covered (HS or CCCN where applicable, otherwise national tariff heading. 
ICS numbers may be provided in  addition, where applicable):   Moulded – case Circuit 
Breakers, Moulded – Case Switches and Circuit – Breaker Enclosures 
(ICS:  31.220.01; ICS 31.220.20). 
5. Title, number of pages and language(s) of the notified document:   Moulded – case 
Switches and Circuit – Breaker Enclosures–  (7 pages, English) 
6. Description of content:   1.1 The requirements of this standard cover molded – case circuit 
breakers, circuit breaker and ground – fault circuit interrupters, fused circuit breakers, and accessory high – fault protector. These circuit breakers are specifically intended to provide 
service entrance, feeder and branch – circuit protection in accordance w ith the Trinidad and 
Tobago Electrical Wiring Code – Part 1 – Low Voltage Installations ( TTS 171: Part 1: 2002 ). 1. This standard also covers instanta neous circuit breakers (circuit interrupters) 
specifically intended for use as part of a co mbination motor controller in accordance with 
TTS 171 Part 1: 2002.  
1.2 This standard covers molded – case switches and fused, molded – case switches. 
 1.3 This standard covers devices rated at 600 volts or less and 6000 amperes or less. 
 
1.4 The devices referenced in 1.1 and 1.2 ar e intended for installation in an overall 
enclosure or as parts of other devices su ch as panel boards. The acceptability of the 
combination will be determined when the complete product is investigated. 
 
1.5 This standard covers circuit – breaker s enclosures and accessory devices intended for 
use with the devices described in 1.1 and 1.2  1.6 This standard does not cover low- voltage  power circuit breakers covered in Appendix 
B, Ref. No 2 and Ref No 3 nor supplementary protectors covered in Appendix B, Ref No 4. 
1.7 This standard contains supplements cove ring  the requirements for molded – case circuit G/TBT/N/TTO/31 
Page 2  
 
  breakers for: 
 
a) Marine Use;  
b) Naval Use; 
c) Uninterruptible Power Supply Use; 
d) Classified Circuit Breakers 
7. Objective and rationale, including the na ture of urgent problems where applicable:  
Compulsory status has been recommended in or der to protect the consumer or user against 
danger to health or safety by ensuring a product of acceptable quality 
8. Relevant documents:    
- TTS 171 Part 1: 2002, Trinidad and Tobago El ectrical Wiring Code – Part 1 Low Voltage 
Insulations. ANSI/ NFPA 70, National Electrical Code 
CSA, C22.1, Canadian Electrical Code  
NON – 001 – SEDE, Electrical Code ANSI/ IEEE C 37.13 – 1993, Low Voltage AC Po wer Circuit Breakers Used in Enclosures 
ANSI/ IEEE C37-14-1999, Low Voltage DC Po wer Circuit Breakers Used in Enclosures 
UL 1077, Standard for Supplementary Protectors for Use in Electrical Equipment CSA C22.2 No 235, Supplementary Protectors 
UL 486 A, Standard for Wire Connectors and Soldering Lugs for Use with Copper 
Conductors CSA C22.2 No.65, Wire Connectors  NMX - J- 395 - ANCE NMX- J- 170 – ANCE 
UL 486B, Standard for use with Aluminum Conductors 
NMX- J – 383 – ANCE NMX – J 254- ANCE UL 486E, Standard for Equipment Wiring Term inals for use with Aluminum and / or 
Copper Conductors 
UL 991, Standard for Tests for Safety- Related Controls Employing Solid – State Devices 
CSA C 22.2 No 0.8 Safety Functions Incorporating Electronic Technology ASTM E 28, Test Method for Softening Point by Ring - and – Ball Apparatus NMX – J 412 – ANCE UL 1585, Standard for Class 2 and 3 Transforms CSA C 22.2 No. 144, Ground – Fault Circuit Interrupters 
NMX - J – 520 – ANCE 
UL 746C, Standard for Polymeric Materials – Use in Electrical Equipment Evaluations UL 1053, Standard for Ground -  Fault Sensing and Relaying Equipment UL 50, Standard for Enclosures for Electrical Equipment NMX - J -235/ 2- ANCE 
NMX - J – 235/ 2 – ANCE 
CSA C 22.2 No 94, Special Purpose Enclosures CSA C 22.2 No .4  UL 414, Standard for Meter Sockets CSA C22.2 No. 115, Meter Mounting Devices  
CSA C22.2  No. 14, Industrial Control Equipment  
Standard for Motor Craft, (Pleasure and Comme rcial), National Fire Protection Association 
( NFPA) 302 UL 67. Standard for Panel boards 
C 22.2 No.29  G/TBT/N/TTO/31 
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  NMX – 118 / 1 – ANCE 
ANSI/ IEEE C37.09 – 1979 (r 1989), Test procedure for AC High – Voltage Circuit Breakers rated on a Symmetrical Current Basis 
9. Proposed date of adoption:   
Proposed date of entry into force:   }On a date to be notified by the Minister to 
whom responsibility for trade and industry is assigned, in a Notice to be published in the 
Trinidad and Tobago Gazette as required by 
the Standards Act. 
10. Final date for comments:   29 May 2008 
11. Texts available from:  National enquiry point [  X ] or address, telephone and fax 
numbers, e-mail and web-site addresses, if available of the other body:   
Trinidad and Tobago Bureau of Standards 
1-2 Century Drive, Trincity Industrial Estate,  Macoya, Tunapuna,  Trinidad and Tobago  
Email:  ttbs@ttbs.org.tt