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Sizing

Posted by colin mckane, on Wed 03 Aug 2016 01:16pm

Size of cable underground 155 metres 690 watt motor for garage door 320 watts led flourescents, door open once am closed once pm

Tom Quirk

Thu 04 Aug 2016 09:51am

hi colin Required Cable Size 4 mm Voltage Drop 7.41 Volts. Percentage Drop 3.2% Current Load 4.35 Amps Max Cable Load* 26.0 Amps 4mm will work but as richard says 6mm would be a future proof option for any additions you may add

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Richard Baldwin

Thu 04 Aug 2016 09:34am

Hello Colin, Given the above information and assuming it's only a single phase supply required, a 4-6mm 3 core SWA cable could be used to provide the necessary power to your garage. I would lean more toward using the 6mm 3 core SWA in case you wish to add any further electrical equipment in the future. If however it is a 3 phase supply the cable size would be 2.5mm 5 core SWA. The cable size is smaller as the load would be spread across the phases If you require any further assistance you can contact me on: brightsparkcymru.com Thanks, Richard Baldwin (Trydanwyr Bright Spark Electricians)

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