AS/NZS Specifies the construction, dimension and test requirements for single-core and multi-core polymeric insulated and non-metallic sheathed. AS/NZS (R). Electric cables – Polymeric insulated – For working voltages up to and including / V. standard by. AS/NZS Category: Cord and Cables. Description: Electric cables – Polymeric insulated – For working voltages up to and including / V.
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As previously explained it is common for low voltage cable standards to define an insulation thickness which varies for different conductor sizes, with the largest conductor having the thickest insulation and sheath.
The following sections refer to a range of tests that are conducted on cables to ensure compliance. The remaining dot points will be addressed in part 2.
The improved electrical properties of XLPE is a result of the chemical makeup of the material, being almost exclusively polyethylene. When looking at the impact of non-compliant resistance on the current rating of a cable, its impact is relatively small, as its current rating is proportional to the inverse of the square root of resistance.
Voltage tests performed on cables are done at higher than normal operating levels. Only the electrical resistance is mandatory. The measurement method 5000.2 above has traditionally been carried out by manual methods and is therefore subject to human error.
It only needs to meet the specified resistance value. Keep up to date with latest from this campaign through our Facebook page! The insulation thickness for LV cables is not primarily based on electrical requirements, but more on mechanical considerations.
See examples in Figure 1 for various types of extrusions. The following briefly describes each of the above tests, their purpose and how they relate to the mechanical performance of the cable in terms of installation and long term operation of the cable.
Subscribe to receive the lastest news from the electrical industry brought to you by Voltimum. Type tests need not be repeated unless changes are made in the cable materials or design or manufacturing process. They may soften, but will not flow. A 35mm2 copper conductor, for example, does not need to have 35mm2 of copper in it. PE has significantly greater dielectric strength compared to PVC, which is a blend of a number of ingredients of which Poly Vinyl Chloride is one.
Modern manufacturing techniques have seen the introduction of automated electronic measurement systems to replace manual methods that provide a significant improvement in repeat accuracy. Join the fight against non-compliant products! These performance requirements are largely based on the mechanical properties of the materials used in cables. The manner in which compliance of these materials is confirmed is complex and will be covered in some detail under the discussion later on insulating materials.
Cross-Linked materials are more thermally stable compared to Thermoplastic materials and will not flow when subjected to high operating temperatures. This first part looks at the electrical and physical dimensional testing requirements for cables, whilst the second part looks at the range of material tests that cable materials must meet to enable compliance to be obtained.
Ability to Carry Rated Current The ability of an electrical cable to carry its design electric current is largely dependent on the electrical resistance of the conductor. The peak Australian electrical industry body, the National Electrical and Communications Association NECA and the world’s leading electrical industry information portal Voltimum have joined forces in an effort to raise awareness and educate users of the dangers of using product that is not compliant to Australian Standards.
Smaller diameter conductors, such as compacted, or the larger diameter non-compacted conductors, do not matter. Introduction In this article I will try to unravel some of the less known aspects of cable compliance with the overall aim to give the user the correct information to make better informed decision when selecting cable products.
AS/NZS – Standards Australia
Type of Business Contractor emp. This is a very important nzz often misunderstood issue. The standards referred to in details the test method used to conduct each test.
What may be not so obvious is how the thickness is actually measured. Take the online training and add your voice to this campaign!. And neither is the diameter of a conductor important as far as compliance is concerned. The insulation thickness on large conductor sizes is greatest due to 0500.2 greater risk of mechanical damage during handling of large and heavy cables.