How do I determine the rating of a cable?
The continuous current rating of a cable is determined by the ability of the cable to dissipate the heat generated by the current passing through its conductor. It depends on a number of parameters, but the most important are the:
The continuous current rating of a cable is determined by the ability of the cable to dissipate the heat generated by the current passing through its conductor. It depends on a number of parameters, but the most important are the:
•Conductors’ DC resistance;
•Thermal resistance of the insulating sheathing materials; and
•Ambient conditions of the environment where the cable is installed (for example the surrounding air temperature).
•Thermal resistance of the insulating sheathing materials; and
•Ambient conditions of the environment where the cable is installed (for example the surrounding air temperature).
For standard cables such as PVC building wire, XLPE SDI or circular cables (all rated 0.6/1kV), the ratings have all been calculated and are tabulated in Australian Standard AS/NZS 3008.1.1. This standard includes various circuit configurations such as single and three phase and various installation arrangement such as “in air”, “direct buried in ground”, “in ducts”, etc.
Olex has included the same tables from AS/NZS 3008.1.1 in the Standard Product Search our customer’s convenience.
For ratings of HV XLPE cables, please see the attached HV PDF in the products sections.
If ratings are required for non-standard cables or for cables in non-standard installation or environmental conditions, Olex have specialised software available for performing the rating calculation to suit specific customer requirements.
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