AS NZS 5000.2 PDF
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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In the case of insulation thickness, this varies with material type and conductor size. Due to the level of detail required to address this topic it will be presented in two parts. Cross-Linked materials are more thermally stable compared to Thermoplastic materials and will not flow when subjected to high operating temperatures.
The insulation thickness for LV cables is not primarily based on electrical requirements, but more on mechanical considerations. It will be fairly obvious that the thickness of the insulation and sheath material must be aligned with the typical use of the product.
AS/NZS | SAA Approvals
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. The 5000.2 in which compliance of these materials is confirmed is complex and will be covered in some detail under the discussion later on insulating materials.
To confirm that a cable can hold its rated voltage the cable is subjected to the following checks and test:. The remaining dot points will be addressed in part 2. 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. 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.
This is a legally nzd document, and therefore the risk of non-compliance is not only unsafe it is also illegal. Only the electrical resistance is mandatory.
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. Take the online training and add your voice to this campaign!.
Does it Comply?
The actual area is not critical nor is it a parameter that must be measured. These are the two measurements that compliance is confirmed and is required by nearly all cable standards today.
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. 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.
And neither is the diameter of a conductor important as far as compliance is concerned. Subscribe to receive the lastest news from the electrical industry brought to you by Voltimum.
Voltage tests performed on cables are done at higher than normal operating levels. Smaller diameter conductors, such as compacted, or the larger diameter non-compacted conductors, do not matter. The improved electrical properties of XLPE is a result of the chemical makeup of the material, being almost exclusively polyethylene.
The measurement method described above has traditionally been carried out by manual methods and is therefore subject to human error. 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? Join the fight against non-compliant products! What may be not so obvious is how the thickness is actually measured.
Type of Business Contractor emp. To be continued in Part 2. A 35mm2 copper conductor, for example, does not need to have 35mm2 of copper in it.
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. It only needs to meet the specified resistance value. Some of the common cable insulating materials are listed below:. 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.
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. 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. Their differences lie in their cost, processability, dielectric performance, mechanical strength and flexibility to name a few.