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Student & Learning Zone - City & Guilds
CABLE CALCS
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<blockquote data-quote="soulman" data-source="post: 193343" data-attributes="member: 9680"><p>Hi a bit of help please guys, currently doing cable calcs and a bit confused</p><p></p><p>lighting circuit (40 metres) 1000w/230 =4.34a</p><p></p><p>5a 3036 fuse</p><p></p><p>5/0.725 =6.89a</p><p></p><p>cable size 1.0mm or 1.5mm</p><p></p><p>volt drop 1.0 cable = 44x6.89x40m /1000 = 12.12v</p><p></p><p>volt drop 1.5 cable = 29x6.89x40m /1000 = 7.99v</p><p></p><p>both are above the 6.9v 3%</p><p></p><p>when looking at table 7.1 in the onsite guide</p><p></p><p>max cable length for 3036 5 amp fuse 1.0 cable is 71m and 108m for 1.5</p><p></p><p>Can you please tell me where i'm going wrong! this has been driving me crazy today headbang </p><p></p><p>cheers</p></blockquote><p></p>
[QUOTE="soulman, post: 193343, member: 9680"] Hi a bit of help please guys, currently doing cable calcs and a bit confused lighting circuit (40 metres) 1000w/230 =4.34a 5a 3036 fuse 5/0.725 =6.89a cable size 1.0mm or 1.5mm volt drop 1.0 cable = 44x6.89x40m /1000 = 12.12v volt drop 1.5 cable = 29x6.89x40m /1000 = 7.99v both are above the 6.9v 3% when looking at table 7.1 in the onsite guide max cable length for 3036 5 amp fuse 1.0 cable is 71m and 108m for 1.5 Can you please tell me where i'm going wrong! this has been driving me crazy today headbang cheers [/QUOTE]
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