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Australian Fire Rated WS52W Cables

When a cable type is assigned a wiring system code it means that a cable, representative of its group as defined by AS/NZS 3013, has satisfied the test criteria for that rating.

In order to understand what a WS rating means, reference to section 3 of AS/NZS 3013 is recommended, however the table below gives a brief overview of how the WS ratings relate to the electrical and mechanical performance of fire rated cables and elements in both normal service and fire conditions.

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WS 1st Numeral
Electrical performance
2nd Numeral
Mechanical performance
Supplementary letter
Number Level of circuit integrity in fire condition Number Level of protection against mechanical damage Water spray test applied
Characteristic lettering “WS” 1 15 min 1 Light The letter “W” shall be applied as appropriate
2 30 min 2 Moderate
3 60 min 3 Heavy
4 90 min 4 Very heavy
5 120 min 5 Extremely heavy

As an example a WS52W rated cable will have the following characteristics;

  • WS – be suitable for inclusion in a wiring system
  • 5 – have electrical performance (circuit integrity) for 120 minutes (two hours) in a fire condition
  • 2 – provide a moderate level of protection against impact damage during normal service
  • W – have electrical performance (circuit integrity) following exposure to water from overhead sprinklers

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