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Student & Learning Zone - City & Guilds
CABLE CALCS
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<blockquote data-quote="PC Electrics" data-source="post: 193361" data-attributes="member: 650"><p>Heff and Meer have spotted one of your mistakes, your design current is 4.4A. The 0.725 only applies to the cable carrying capacity when hitched to a 3036.</p><p></p><p>Also you haven't applied any diversity. For a domestic lighting circuit you can apply 66%. This would bring your calc below the 3% I expect.</p><p></p><p>If it's commercial and all the lights will be on, then consider how the load is spread along the cable (as per Specs suggestion) and calculate each section, then add up the sections. Do it in 3 sections first as a rough calc to see if it works for you.</p><p></p><p>Is this an exercise or a real job? if it's real, use 1.5mm for the loop through and 1.0mm for the switch drops. On a 3036 1.0mm is on the edge of it's ccc on a 3036 if it runs through any significant insulation. And you don't know if someone is gonna hang a load of GU10 downlighters on the end of your 40m.</p></blockquote><p></p>
[QUOTE="PC Electrics, post: 193361, member: 650"] Heff and Meer have spotted one of your mistakes, your design current is 4.4A. The 0.725 only applies to the cable carrying capacity when hitched to a 3036. Also you haven't applied any diversity. For a domestic lighting circuit you can apply 66%. This would bring your calc below the 3% I expect. If it's commercial and all the lights will be on, then consider how the load is spread along the cable (as per Specs suggestion) and calculate each section, then add up the sections. Do it in 3 sections first as a rough calc to see if it works for you. Is this an exercise or a real job? if it's real, use 1.5mm for the loop through and 1.0mm for the switch drops. On a 3036 1.0mm is on the edge of it's ccc on a 3036 if it runs through any significant insulation. And you don't know if someone is gonna hang a load of GU10 downlighters on the end of your 40m. [/QUOTE]
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