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Cable size

NGUACE
Hi all,


I am extending the lighting in my garden with no way of identifying the swa cable size? I have purchased some vernier callipers, measured the individual core to be 0.48, as there are 7 cores I work out the csa of the cable to be 1.26mm2.


Unfortunately depending on what table I look at, SWG, AWG, of which each seems to have a number of contradictory ones, I cannot confirm if it is 1mm2 or 1.5mm2.


the issue is I have spent days trying to find someone who stocks 1mm2 SWA, I assume due to cost no one uses it any longer as just  as cheap to get 1.5mm2.


re wiring with 1.5mm2 back from the rcd is not really an option, the cable is buried under concrete and having to re wire would mean drilling through the house and re laying a new cable?


so guess the short question is, anyone know of anyone selling 1mm2 SWA?


thank you all for your time and assistance.


Andy
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  • 0
    Although the question seems well resolved, the following might help anyone else trying to identify a conductor by mechanical measurements.


    Wire sizes are specified by IEC60228 in terms of electrical properties (resistance), not directly in terms of actual cross-section. With the quality of copper normal in wires nowadays, the actual cross-section is smaller than the nominal value.  Around 1.25 mm2 for nominal 1.5 mm2 is similar to what I've noticed.


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  • 0
    Although the question seems well resolved, the following might help anyone else trying to identify a conductor by mechanical measurements.


    Wire sizes are specified by IEC60228 in terms of electrical properties (resistance), not directly in terms of actual cross-section. With the quality of copper normal in wires nowadays, the actual cross-section is smaller than the nominal value.  Around 1.25 mm2 for nominal 1.5 mm2 is similar to what I've noticed.


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