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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Ability to Carry Rated Current The ability of an electrical cable to carry its design electric current nzd largely dependent on the electrical resistance of the conductor. The remaining dot points will be addressed in part 2.
This is a very important and often misunderstood issue. The peak Australian electrical industry body, the National Electrical and Communications Association NECA and the world’s leading electrical industry information portal Voltimum nz joined forces in an effort to raise awareness and educate users of the dangers of using product that is not compliant to Australian Standards.
Voltage tests performed on cables are done at higher than normal operating levels. This is a legally mandated document, and therefore the risk of non-compliance is not only unsafe it is also illegal.
Some of the common cable insulating materials are listed below:. 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. Smaller diameter conductors, such as compacted, or the larger diameter non-compacted conductors, do not matter.
Type of Business Contractor emp. 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?
They may soften, but will not flow. In terms of cables the wiring rules makes direct reference to Australian and New Zealand Standards as the principle means to ensure that its scope is fulfilled. Only the electrical resistance is mandatory. In the case of insulation thickness, this varies with material type and conductor size. The following sections refer to a range of tests that are conducted on cables to ensure compliance.
The standards referred to in details the test method used to conduct each test. 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.
These are the two measurements that compliance is confirmed and is required by nearly all cable standards today. And neither is the diameter of a conductor important as far as compliance is concerned.
The measurement method described above has traditionally been carried out by manual methods and is therefore subject to human error. Type tests need not be repeated unless changes are made in the cable materials or design or manufacturing process. Cross-Linked materials are more nzx stable compared to Thermoplastic materials and will not flow when subjected to high operating temperatures.
A 35mm2 copper conductor, for example, does not need to have nnzs of copper in it. The insulation thickness on large conductor sizes is greatest due to the greater risk of mechanical damage during handling of large and heavy cables. See examples in Figure 1 for various types of extrusions. It only needs to meet the specified resistance value.
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. What may be not so obvious is how the thickness is actually measured.
AS/NZS – Standards Australia
Their differences lie in their cost, processability, dielectric performance, mechanical strength and flexibility nss name a few. Keep up to date with latest from this campaign through our Facebook page! Join the fight against non-compliant products! 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 50000.2 cable.
Subscribe to receive the lastest news from the electrical industry brought to you by Voltimum. Take the online training and add your voice to this campaign!. Modern manufacturing techniques have seen the introduction of automated electronic measurement systems to replace manual methods that provide a significant improvement in repeat ns.
The actual area is not critical nor is it a parameter that must be measured.
These performance requirements are largely based on the mechanical properties of the materials used in cables. In the first part of this article I will address the first dot point only. 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.
The thickness of insulation and sheath of cables is done by taking six measurements at the location where the material is thinnest using optical magnification equipment of at least 10X to allow a reading of 0. 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, az and physical injury hazards.
It will be fairly obvious that the thickness of the insulation and sheath material must be 50002. with the typical use of the product.
The insulation thickness for LV cables is not primarily based on electrical requirements, but more on mechanical considerations. As previously explained it is common for low voltage cable standards to define an insulation thickness which varies for different conductor sizes, with the aw conductor having the thickest insulation and sheath. To confirm that a cable can hold its rated voltage the cable is subjected to the following checks and test:.