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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These performance requirements are largely based on the mechanical properties of the materials used in cables. Nsz differences lie in their cost, processability, dielectric performance, mechanical strength and flexibility to name a few. 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.
In the case of insulation thickness, this varies with material type and conductor size. 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.
AS/NZS | SAA Approvals
A variety of cable insulating materials exists in the cable manufacturing industry, all having differing properties, but all having the primary attribute of being suitable as an electrical insulating material. Due to the level of detail required to address this topic it will be presented in two parts. Then there is the material that is in contact with the conductor. The following sections refer to a range of tests that are conducted on cables to ensure compliance.
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.
The thickness of insulation and 500.2 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.
These are the two measurements that compliance is confirmed and is required by nearly all cable standards today.
They may soften, but will not flow. 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. 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 confirm that a cable can hold its rated voltage the cable is subjected to the following checks and test:.
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. Take the online training and add your voice to this campaign!. The measurement method described above has traditionally been carried out by manual methods and is therefore subject to human error.
And neither is the diameter of a conductor important as far as compliance is concerned.
To be continued in Part 2. Only the electrical resistance is mandatory. Smaller diameter conductors, such as compacted, or the larger diameter non-compacted conductors, do not matter. The insulation thickness for LV cables is not primarily based on electrical requirements, but more on mechanical considerations.
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Type tests need not be repeated unless changes are made in the cable materials or design or manufacturing process. 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 0500.2 This is a legally mandated document, and therefore the risk of non-compliance is not only unsafe it is also illegal.
The remaining dot points will be addressed in part 2. Join the fight against non-compliant products! In the first part of this article I will address the first dot point only. PE has significantly greater dielectric strength compared to Ns, which is a blend of a number of ingredients of which Poly Vinyl Chloride is one.
上海南大集团有限公司 — Products — AS/NZS standard for Australia & New Zealand Market
Modern manufacturing techniques have seen the introduction of automated electronic measurement systems to replace manual methods that provide a significant improvement in repeat accuracy. Subscribe to receive the lastest news 0500.2 the electrical industry brought to you by Voltimum. Keep up to date with latest from this campaign through our Facebook page!
A 35mm2 copper conductor, for example, does not need to have 35mm2 of copper in it.
The improved electrical properties of XLPE is a result of the chemical makeup of the material, being almost exclusively polyethylene. Cross-Linked materials are more thermally stable compared to Thermoplastic materials and will not flow when subjected to high operating temperatures. 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 nzss various types of extrusions.