AS/NZS 5000.1:2005 pdf – Electric cables-Polymeric insulated Part 1: For working voltages up to and including 0.6/1 (1.2) kV.
7.2.2 Fillers, barrier tapes and binders
When used, fillers. barrierlbinder tapes and other binders shall be compatible with the other materials of the cable with which they are in contact.
Unless specified otherwise, the use of fillers, barrier/binder tapes and other binders is optional.
8 BEDDING (OPTIONAL)
8.1 General
Bedding complying with the requirements of this Clause or an oversheath complying with the requirements of Clause 13. shall be provided directly under any metallic layer.
Where dissimilar metallic layers are used, i.e. where electrolysis and galvanic corrosion is possible or electric potential differences may occur (e.g. one metallic layer is used as a neutral while other metallic layers are earthed), electrical separation is required. In this case bedding shall not be used and the metallic layers shall be separated by a separation layer complying ith Clause 10.
8.2 Material
The bedding shall comprise non-metallic materials, either extruded or taped.
8.3 Application
8.3.l Taped bedding
Taped bedding shall comprise one or more tapes applied to form a layer. For multicore cables sith circular cores with a conductor size greater than 16 mm2. tillers shall be used in the outer interstices.
8.3.2 Extruded bedding
Extruded bedding shall be applied over, but not adhere to the core assembly or underlying cable component. However, any binder or a barrier tape may adhere to the bedding. For multicore cables with circular cores with a conductor size greater than 16 mm2. the outer interstices heteen the cores shall be filled by either fillers or the bedding.
8.4 Thickness
8.4.1 General
Except as provided for in Clause 8.4.2. the thickness of bedding shall he derived from Table 2.
8.4.2 Reduced thickness tapeti bedding under a metallic screen or conceniric conductor
Where the metallic screen or concentric conductor to be applied over the core or core assembly comprises one or more metallic tapes of not greater than 0.08 mm nominal thickness, or wires not greater than 0.50 mm nominal diameter, the approximate thickness of the taped bedding may be reduced to 0.1 mm.
9METALLIC LAYERS (OPTIONAL)
The metallic layer applied to single-core cable or the individual cores of a multicore cableshall be non-ferromagnetic, except where the cable is for d.c application only.
Multiple metallic layers may be applied over the core or core assembly in any order asappropriate for the intended use of the cable.
Unless otherwise specified (see Clauses 11 and 12) metallic layers shall be applied over abedding complying with the requirements of Clause 8 or a separation layer complying withthe requirements of Clause 10.
NOTES:
1 The following metallic layers may be used, as appropriate:
(a) Metallic screen, surrounding the cores either individually or collectively. Typically this
may comprise, but is not restricted to, one or more metallic or metallized tapes, a wirebraid or a concentric layer of wires helically applied or in waveform configuration, or acombination of metallic tape and wires.
(b)Concentric conductor (for cables other that those covered in AS/NZS 4961). Typically
this may comprise, but not be restricted to, a concentric layer of wires helically appliedor in waveform configuration.
(c) Metallic sheath (see Clause 12).(d)Armour (see Clause 1l).
2 For purchasing guidelines,see Appendix A.
AS/NZS 5000.1:2005 pdf – Electric cables-Polymeric insulated Part 1: For working voltages up to and including 0.6/1 (1.2) kV
