Engineering:Trirated cable
Trirated Cable is a high temperature, flame retardant electrical wire designed for use inside electrical equipment, such as control panels. Trirated cable is often referred to as panel wire, T.R.S (tri-rated singles) or BS 6231 Cable.[1]
Trirated Cable is so called because it meets the requirements of three different international standards: BS 6231, UL (or Underwriters Laboratories), and CSA (Canadian Standards Association). Combining three international standards in one product, makes trirated cable suitable for use in equipment required to meet both North American and European wiring regulations.[2]
According to the UL standard, the maximum operating temperature of Trirated Cable is 105 °C. The British Standard BS 6231 states that the cable should have a maximum operating temperature of 90 °C for continuous use. Voltage rating is another area in which the standards vary. UL and CSA give Trirated Cable a voltage rating of 600 V, whilst it is rated at 1000 V in the BS 6231 standard.
Construction
Tri-rated cables are made with a flexible copper conductor (class 5 of flexibility as rated by British Standard BS EN 60228:2005), and insulation of heat resistant Polyvinyl Chloride (HR PVC). Trirated cable is manufactured in a wide variety of insulation colours, including brown, orange, yellow, pink, and dark blue.[3]
Uses
Trirated Cable is designed specifically for use in the switch, control, relay and instrumentation panels of power circuits and as internal connectors in rectifier equipment, motor starters and controllers.[2]
Standards
BS 6231 is a British Standard last updated in 2006 by the BSI Group.[4] This standard specifies the performance and construction requirements of electrical cables that are single core, non-sheathed, PVC-insulated and of rated voltage 600/1000 V. Wire approved to BS 6231 may not also carry the UL and CSA ratings.[citation needed]
See also
References
Further reading
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