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 insulation thickness on large conductor sizes is greatest due to the greater risk of mechanical damage during handling of large and heavy cables. 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.
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.
The manner in which compliance of these materials is 5000.2 is complex and will be covered in some detail under the discussion later on insulating materials.
The actual area is not critical nor is it a parameter that must be measured. Then there is the material that is in contact with the conductor.
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. Keep up to date with latest from this campaign through our Facebook page! 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. In the first part of this article I will address the first dot point only.
A 35mm2 nze conductor, for example, does not need to have 35mm2 of copper in it. The following sections refer to a range of tests that are nzzs on cables to ensure compliance. In the case of insulation thickness, this varies with material type and conductor size. To be continued in Part 2. These are the two measurements that compliance is confirmed and is required by nearly all cable standards today.
Cross-Linked materials are more thermally stable compared to Thermoplastic materials and will not flow when subjected to high operating temperatures.
They may soften, but will not flow. It only needs to meet the specified resistance value. What may be not so obvious is how the thickness is actually measured. 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. 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.
Modern manufacturing techniques have seen the introduction of automated electronic measurement systems to replace manual methods that provide a significant improvement in repeat accuracy. These performance requirements are largely based on the mechanical properties of the materials used in cables. Voltage tests performed on cables are done at higher than normal operating levels.
Type of Business Contractor emp.
Does it Comply?
The standards referred to in details the test method used to conduct each test. 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? 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.
上海南大集团有限公司 — Products — AS/NZS standard for Australia & New Zealand Market
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 55000.2 compliance to be obtained. It will be fairly obvious that the thickness of the insulation and sheath material must be aligned with the typical use of the product. 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.
Join the fight against non-compliant products! 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. The improved electrical properties of XLPE is a result of the chemical makeup of the material, being almost exclusively polyethylene.