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SWA Cable Current Carrying Capacity:
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Steel Wire Armoured (SWA) cable current carrying capacity refers to the maximum electric current that a cable can carry without exceeding its temperature rating. This is determined by standards such as BS 7671 or AS/NZS 3008, which provide tables of values based on core size and installation method.
The calculator estimates current carrying capacity based on:
Where:
Explanation: The calculation references standard tables that account for heat dissipation characteristics based on installation method and conductor size.
Details: Proper current capacity calculation is essential for electrical safety, preventing cable overheating, ensuring system reliability, and complying with electrical codes and standards.
Tips: Enter the cable core size in mm² and select the installation method. The calculator will provide an estimated current carrying capacity based on standard reference tables.
Q1: What factors affect SWA cable current carrying capacity?
A: Conductor size, installation method, ambient temperature, cable grouping, and thermal insulation all affect current capacity.
Q2: Why are there different values for different installation methods?
A: Different installation methods affect how heat is dissipated from the cable, which directly impacts its current carrying capacity.
Q3: How accurate are these calculated values?
A: This calculator provides estimates. For precise calculations, always consult the latest edition of the relevant standards and consider all installation factors.
Q4: What is derating and when is it applied?
A: Derating reduces the current capacity when cables are installed in groups, in high ambient temperatures, or surrounded by thermal insulation.
Q5: Can this calculator be used for all cable types?
A: This calculator is specifically designed for Steel Wire Armoured (SWA) cables. Other cable types have different current carrying capacities.