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Do-It-Yourself (DIY) Question & Answer Forum
Running 1.5mm wire from 2.5mm ring for lighting
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<blockquote data-quote="Bruspark" data-source="post: 501188" data-attributes="member: 20106"><p>If you do indeed have 16 x 7Watt LED fixtures that is a total specified of 112 watts and at 230V that is theoretically 0.5A. In practice Amps or VA matters and so it could all run at somewhat more or a bit less then 0.5A ...</p><p> </p><p> More important is that Each fitting will take a great big gulp of current at switch on and that surge is notorious for tripping or blowing breakers , dimmer switches and fuses. </p><p> (If you proceed with your dimmer idea check the spec of the dimmer unit carefully - not just for watts but for any maximum number of fittings in the specification. Many say 'max 10 LED lamps' alongside a maximum wattage due in part to start-up surge issues. )</p><p> </p><p> Your 3A BS plug fuse in the SFU is designed not to blow before 5A ever and may well carry a surge of 10A + for a fraction of a second. So a 3A fuse is unlikely to blow despite the switch-on surge.</p><p> If however you went down to a 1A fuse (especially without a soft start /dimmer) it may well blow at some inconvenient moment due to the effects on the tiny fuse wire of repeated switch on surges.</p></blockquote><p></p>
[QUOTE="Bruspark, post: 501188, member: 20106"] If you do indeed have 16 x 7Watt LED fixtures that is a total specified of 112 watts and at 230V that is theoretically 0.5A. In practice Amps or VA matters and so it could all run at somewhat more or a bit less then 0.5A ... More important is that Each fitting will take a great big gulp of current at switch on and that surge is notorious for tripping or blowing breakers , dimmer switches and fuses. (If you proceed with your dimmer idea check the spec of the dimmer unit carefully - not just for watts but for any maximum number of fittings in the specification. Many say 'max 10 LED lamps' alongside a maximum wattage due in part to start-up surge issues. ) Your 3A BS plug fuse in the SFU is designed not to blow before 5A ever and may well carry a surge of 10A + for a fraction of a second. So a 3A fuse is unlikely to blow despite the switch-on surge. If however you went down to a 1A fuse (especially without a soft start /dimmer) it may well blow at some inconvenient moment due to the effects on the tiny fuse wire of repeated switch on surges. [/QUOTE]
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Running 1.5mm wire from 2.5mm ring for lighting
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