pete10uk Posted February 10, 2016 Share Posted February 10, 2016 Just a quick question some one might be able to answer quickly for me. I have been asked to move an led video wall to a new location. The maximum power draw of the wall is 10amps, so we don't have an issue powering the wall from a single 13a socket, however if I add up the quoted earth leakage figures we get 31mA, which is over the 30 mA RCD fitted. My question is if we're running the wall at half brightness which it is set to, are we likely to reduce the earth leakage considerably? My logic is half the power in = half the potential for leakage, or is it more like the control boards and power supplies cause most of the leakage so not much change? I'm just trying not to have to get the elctrition in to swap the RCD over. Any pointers would be gratefully received. Please feel free to move to the power forum if more appropriate Cheers Link to comment Share on other sites More sharing options...
Brian Posted February 11, 2016 Share Posted February 11, 2016 ...if we're running the wall at half brightness which it is set to, are we likely to reduce the earth leakage considerably? No, it'll not drop at all. 99% of the leakage current will come from the mains filtering which is fitted right at the mains input. It's there all the while and on some equipment you even get mains leakage when the equipment is off. Link to comment Share on other sites More sharing options...
Yorkie Posted February 11, 2016 Share Posted February 11, 2016 Many 30mA RCD's trip at less than 30mA, 22 or 23 is not uncommon. If it needs to use 30mA protected circuits then I would suggest using two, ideally dedicated ones Link to comment Share on other sites More sharing options...
Jivemaster Posted February 11, 2016 Share Posted February 11, 2016 Switch mode leakage originates at every cycle of every switched inductor, adding devices merely imposes them all on the same earth wire. You cannot know how trains of spikes from every smpsu will add because they will be at "random" repeat rates and hence "phase angles" to each other. Your options include lots of measurements, or some trial and error (how much leakage gets to that breaker from other things?) Link to comment Share on other sites More sharing options...
Pete McCrea Posted February 12, 2016 Share Posted February 12, 2016 Indeed - as others have said the leakage will be constant regardless of the brightness. There will be a large change in current between 10% and 100% brightness. It might be worth measuring the leakage current to confirm the actually figure. Link to comment Share on other sites More sharing options...
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