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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The standards referred to in details the test method used to conduct each test. 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. Type tests need not be repeated unless changes are made in the cable materials or design or manufacturing process.
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.
Take the online training and add your voice to this campaign!. Due to the level of detail required to address this topic it will be presented in two parts. It will be fairly obvious that the thickness of the insulation and sheath material must be aligned with the typical use of the product.
To be continued in Part 2.
A variety of cable insulating materials exists in the cable manufacturing industry, all having differing properties, but all having the primary attribute of zns suitable as an electrical insulating material. 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.
See examples in Figure 1 for various types of extrusions. There has been much publicity recently about the recall of non-compliant building cables, but what does compliance actually mean as far as a cable is concerned and how does it actually relate to performance?
Subscribe to receive the lastest news from the electrical industry brought to you by Voltimum. 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 ns of the cable.
The insulation thickness for LV cables is not primarily based on electrical requirements, but more 500.2 mechanical considerations. 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. This is a legally mandated document, nsz therefore the risk of non-compliance is not only unsafe it is also illegal.
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. Modern manufacturing techniques have seen the introduction of automated electronic measurement systems to replace manual methods that provide a significant improvement in repeat accuracy. Ability to Carry Rated Current The ability of an 5000.2 cable to carry its design electric current is largely dependent on the electrical resistance of the conductor.
To confirm that a cable can hold its rated voltage the cable is subjected to the following checks and test:.
AS/NZS – Standards Australia
This document defines the principles upon which electrical installations must be designed and installed in order to protect people, livestock and property from the risk of electrical shock, fire and physical injury hazards.
The following sections refer to a range of tests that are conducted on cables to ensure compliance. In the first part of this article I will address the first dot point only. In the nzd of insulation thickness, this varies with material type and conductor size. Cross-Linked materials are more thermally stable compared to Thermoplastic materials and will not flow when subjected to high operating temperatures.
It only needs to meet the specified resistance value.
AS/NZS | SAA Approvals
This is a common testing principle where the test object is subjected to a higher stress than it would normally be expected to operate at, with the intention to flush out extrusion defects or weaknesses in the insulation materials. The remaining dot points will be addressed in part 2.
Smaller diameter conductors, such as compacted, or the larger diameter non-compacted conductors, do not matter. 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. Then there is the material that is in contact with the conductor.
And neither is the diameter of a conductor important as far as compliance is concerned. What may be not so obvious is how the thickness is actually measured. 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.
They may soften, but will not flow.