AS/NZS 3013:2005 pdf – Electrical installations-Classification ofthe fire and mechanical performance of wiring system elements.
3.4 SIJPPLEMENTARY LETTER W
The supplementary letter W. when added to the basic designation, represents the ability of cables and busways to maintain circuit integrity when subject to the tire test in accordance with Appendix A. followed by a water spray lest in accordance with Appendix B.
3.4.2 Ability to maintain circuit integrity
The addition of the supplementary letter W to a cable or busway classification means that
the cable or busway is able to maintain circuit integrity when—
(a) tested against exposure to lire conditions in accordance with Appendix A for the period specified by the first characteristic numeral (see Clause 3.2): and
(b) then subjected to a water spray test, as specified in Appendix B.
3.4.3 Compliance
Compliance of an element of a wiring system to a W classification means that the element is able to maintain circuit integrity in accordance with Clause 3.4.2. Tests for first characteristic numeral of lower rank classification need not be conducted.
The water spray test need not he performed on supports and fixings. Supports and fixings are deemed to comply and may be assigned a supplementary letter ‘W’ in their classification.
(iv) Screened, braided or armoured single cores constitute a different cable
construction and therefore require a separate qualification using 35 mm’cablesin the trefoil configuration. Any metallic covering shall be earthed during thetests.
(v) Changes in cable voltage rating require a separate qualification using 35 mm’
cables in a trefoil configuration.
(vi) A cable having a different insulation or sheath designation shall be classed as a
different‘type of cable’and shall require a separate qualification. Thedesignation of insulation and designation of sheath is as defined inAS/NZS 3808 and a different ‘type of cable’is when a different material (asdefined in AS/NZS 3808) is used.
For qualification of Group 2, the specimen to be tested shall be a single 10 mm2three-core and earth sheathed circular cable. This test shall qualify all other multicorecable sizes, and qualifies the range of constructions such as the 2C,2C+E,3C,3C+E,4C, and 4C+E, with the following exceptions:
(i) Tests on any other size of cable specifically qualify that size only.
(ii) Changes in the class of conductor (as defined in AS/NZS 1125) require a
separate qualification using a 10 mm2three-core and earth sheathed circularcable.
(iii)Changes in the flame/fire barrier (i.e. material type or construction，yield,
coverage or number of tapes applied) require a separate qualification using a10 mm2 three-core and earth sheathed circular cable.
(iv) Screened, braided or armoured multicores constitute a different cable
construction and therefore require a separate qualification using a 10 mm2three-core and earth sheathed circular cable. Any metallic covering shall beearthed during the tests.
Changes in cable voltage rating require a separate qualification using a 10 mm’three-core and carth sheathed circular cable.
(vi) A cable having a different insulation or sheath designation shall be classed as a
different‘type of cable’and shall require a separate qualification. Thedesignation of insulation and designation of sheath is as defined inAS/NZS 3808 and a different ‘type of cable’is when a different material (asdefined in AS/NZS 3808) is used.
(vii) If the cable construction changes from circular to flat,separate qualification is
required using a 10 mm2three-core and earth sheathed flat cable.
AS/NZS 3013:2005 pdf – Electrical installations-Classification ofthe fire and mechanical performance of wiring system elements
