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Do-It-Yourself (DIY) Question & Answer Forum
Just pricing a job....
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<blockquote data-quote="Badger" data-source="post: 204014" data-attributes="member: 46"><p>personally it appears the type of job thats not been done to a very good standard, so i would be suggesting that you check all routes even if that means lifting floors,</p><p></p><p>98 downlights on 2 circuits is very excessive, id be very wary of energising all those lights on just circuits :coat </p><p></p><p>my calcs without cable lengths etc is as follows,</p><p></p><p>98 light fittings/downlights divide 2 circuits = 49 lights per circuit</p><p></p><p>49 lamps at 20 watt each lamp = 980 watts</p><p></p><p>980 watts divide 230 volts = 4.3 amps</p><p></p><p>6 amp trip covering 1.0mm rated at max current rating 11 amps, is just within, BUT thats at 20 WATTS per lamp,</p><p></p><p>35 watts per lamp = 1715 Watts = divide 230 v = 7.45 Amps</p><p></p><p>50 Watt lamps = 10.66 amps on 230v supply, so the best youd get from this is 20 watts lamps on all fittings.</p><p></p><p>circuit design should have been as follows, 1.5mm twin and earth, supplying max of say 15 down light each circuit =</p><p></p><p>50 watt = 750 watts = 3.26A</p><p></p><p>35 watt = 525 watts = 2.28A</p><p></p><p>20 watt = 300 watts = 1.3A</p><p></p><p>much better design, 3 circuits for down stairs and 3 circuits for upstairs i would have suggested. hope that helps kme</p></blockquote><p></p>
[QUOTE="Badger, post: 204014, member: 46"] personally it appears the type of job thats not been done to a very good standard, so i would be suggesting that you check all routes even if that means lifting floors, 98 downlights on 2 circuits is very excessive, id be very wary of energising all those lights on just circuits :coat my calcs without cable lengths etc is as follows, 98 light fittings/downlights divide 2 circuits = 49 lights per circuit 49 lamps at 20 watt each lamp = 980 watts 980 watts divide 230 volts = 4.3 amps 6 amp trip covering 1.0mm rated at max current rating 11 amps, is just within, BUT thats at 20 WATTS per lamp, 35 watts per lamp = 1715 Watts = divide 230 v = 7.45 Amps 50 Watt lamps = 10.66 amps on 230v supply, so the best youd get from this is 20 watts lamps on all fittings. circuit design should have been as follows, 1.5mm twin and earth, supplying max of say 15 down light each circuit = 50 watt = 750 watts = 3.26A 35 watt = 525 watts = 2.28A 20 watt = 300 watts = 1.3A much better design, 3 circuits for down stairs and 3 circuits for upstairs i would have suggested. hope that helps kme [/QUOTE]
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