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Volt Drop Calculations
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<blockquote data-quote="Themightyimps" data-source="post: 531776" data-attributes="member: 34932"><p>Evening all, just want to run a query past you if I could. A 3 phase supply has been installed on a site and I have been asked to 'just run a cable in'. This proposed supply would initially be to an existing 63A CU that needs replacing and is currently run from a domestic CU on site. It is approximated that the run from new 3 phase to said CU is 100m and multicore SWA would be buried. Consulting 4E4A table I have values of 75 and 96A for 16mm and 25mm respectively giving Mv/A/M of 2.5 for 16mm. Using the formula for VD 2.5x63x100÷1000 I get a VD of 15.75 suggesting 25mm+ will be required. Could anybody advise on permissable % drops for SWA. Thanks in advance</p></blockquote><p></p>
[QUOTE="Themightyimps, post: 531776, member: 34932"] Evening all, just want to run a query past you if I could. A 3 phase supply has been installed on a site and I have been asked to 'just run a cable in'. This proposed supply would initially be to an existing 63A CU that needs replacing and is currently run from a domestic CU on site. It is approximated that the run from new 3 phase to said CU is 100m and multicore SWA would be buried. Consulting 4E4A table I have values of 75 and 96A for 16mm and 25mm respectively giving Mv/A/M of 2.5 for 16mm. Using the formula for VD 2.5x63x100÷1000 I get a VD of 15.75 suggesting 25mm+ will be required. Could anybody advise on permissable % drops for SWA. Thanks in advance [/QUOTE]
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