BenEdwards Posted November 28, 2014 Share Posted November 28, 2014 Hi, I have just got a QTX DP4 dimmer pack. It is rated at 10 amps and has 4*2.5 amp fuses in it. The manual says it is OK to change fuses as long as they all do not add to more than 10amp. Want to run a couple of 300w par56 and a couple of Fresnel type 750 lamps. I was thinking of punting two 1.5amps (360w) and two 3.5maps (840W) fuses in but not sure where to get them from. Ben Link to comment Share on other sites More sharing options...
timsabre Posted November 28, 2014 Share Posted November 28, 2014 Hi, I have just got a QTX DP4 dimmer pack. It is rated at 10 amps and has 4*2.5 amp fuses in it. The manual says it is OK to change fuses as long as they all do not add to more than 10amp. Want to run a couple of 300w par56 and a couple of Fresnel type 750 lamps. I was thinking of punting two 1.5amps (360w) and two 3.5maps (840W) fuses in but not sure where to get them from. Ben Lots of ebay places will sell you individual fuses, or CPC/RS/Farnell will but have a £20 minimum order charge.In any case I doubt you'd blow a 2.5A fuse with a 750W lamp. Would probably fail at the most inconvenient moment though if it did go. Link to comment Share on other sites More sharing options...
kgallen Posted November 28, 2014 Share Posted November 28, 2014 Crikey Ben, you're going through the mill with this lighting aren't you. The manual gives no clue as to the type and characteristics of the fuse to use. I'm guessing they are fast blow 20mm glass, but that is just a guess. It's more of a guess because in e.g. Betapacks, a high breaking capacity sand-filled fuse cartidge is specified at 10A. 20mm glass fuses aren't in the same league with regard to breaking capacity in this application. The usual suspects are: CPC http://cpc.farnell.com/ Farnell http://uk.farnell.com/ RS http://uk.rs-online.com/web/ Add to the post if you find out more specifically what type of fuse they are then we should be able to direct you a bit more precisely. Post a photo if necessary. HTH Kevin Link to comment Share on other sites More sharing options...
BenEdwards Posted November 28, 2014 Author Share Posted November 28, 2014 Yes, thanks. Getting there. Its all a bit of a rush as we are trying to get kit together for middle of net week. Link to comment Share on other sites More sharing options...
handyandi Posted November 28, 2014 Share Posted November 28, 2014 One thing I will add is make sure you completely disconnect the unit from the mains by unplugging the IEC before doing anything with the fuses as they are live even with the mains switch off! Link to comment Share on other sites More sharing options...
erik10_4 Posted November 28, 2014 Share Posted November 28, 2014 Yep, that dimmer has quite a low overall load capacity at 10A which is why I suggested something like the Soundlab 4 channel Dimmer which has a total load of 16 Amps. You can get 3.15A 20mm glass fastblow (if, as kgallen says, that is the type required) here , which would be fine for your 750W channels and 1.6A 20mm fastblow here . Same seller with 1st class postage and both in packs of 10. Link to comment Share on other sites More sharing options...
BenEdwards Posted November 29, 2014 Author Share Posted November 29, 2014 One thing I will add is make sure you completely disconnect the unit from the mains by unplugging the IEC before doing anything with the fuses as they are live even with the mains switch off! Did not realise the Soundlab was 16amp but 500w should be enough for us. Would of got it if I have realised. So does this need a special ,mains ring (like a cooker one). Ben Yep, that dimmer has quite a low overall load capacity at 10A which is why I suggested something like the Soundlab 4 channel Dimmer which has a total load of 16 Amps. You can get 3.15A 20mm glass fastblow (if, as kgallen says, that is the type required) here , which would be fine for your 750W channels and 1.6A 20mm fastblow here . Same seller with 1st class postage and both in packs of 10. I thought 3.15 were 724.5 amps. Did find 1.5 and 3.5 at: http://www.audiomate.co.uk/proddetail.php?prod=Fuse-Glass-Fast-Blow-20mm-1.5-Amphttp://www.audiomate.co.uk/proddetail.php?prod=Fuse-Glass-Fast-Blow-20mm-3.5-Amp Min order 100 but at least we would not run out (only 10p eatch). Maybe I should resell them on ebay;). Ben Link to comment Share on other sites More sharing options...
david.elsbury Posted November 29, 2014 Share Posted November 29, 2014 Wow, how many topics is this now? I wish you luck. :) Link to comment Share on other sites More sharing options...
erik10_4 Posted November 29, 2014 Share Posted November 29, 2014 Did not realise the Soundlab was 16amp but 500w should be enough for us. Would of got it if I have realised. So does this need a special ,mains ring (like a cooker one). If you were to want use the full 16A you would want more than a domestic socket....however, 4 x 750W lanterns would only pull 12.5A on a 240V supply so a domestic 13A ring main is fine (I only use 650W max lanterns so never an issue for me). I thought 3.15 were 724.5 amps. Only if your supply voltage was 230V....The average voltage in the UK is around 242V (I have measured it as high as 252V but have never yet measured as low as 230V) so I base calculations on an average 240V supply....and always buy lamps rated at 240V rather than the 230V ones http://www.blue-room.org.uk/public/style_emoticons/default/rolleyes.gif. Link to comment Share on other sites More sharing options...
BenEdwards Posted November 29, 2014 Author Share Posted November 29, 2014 Wow, how many topics is this now? I wish you luck. :) I think shorter more focused threads are always better for eveyong and for archiving (i.e. people finding stuff through search. Hope people tont mind. Ben Did not realise the Soundlab was 16amp but 500w should be enough for us. Would of got it if I have realised. So does this need a special ,mains ring (like a cooker one). If you were to want use the full 16A you would want more than a domestic socket....however, 4 x 750W lanterns would only pull 12.5A on a 240V supply so a domestic 13A ring main is fine (I only use 650W max lanterns so never an issue for me). I thought 3.15 were 724.5 amps. Only if your supply voltage was 230V....The average voltage in the UK is around 242V (I have measured it as high as 252V but have never yet measured as low as 230V) so I base calculations on an average 240V supply....and always buy lamps rated at 240V rather than the 230V ones http://www.blue-room.org.uk/public/style_emoticons/default/rolleyes.gif. Thanks for than, very useful. Maplin actuary do both those fuses. Ben Link to comment Share on other sites More sharing options...
adam2 Posted November 29, 2014 Share Posted November 29, 2014 Yes, the actual mains voltage varies a bit but is typicly about 240 volts most of the time in most places. Base most calculations on 240 volts and use 240 volt lamps. Beware of over detailed calculation though, remember that the mains voltage varies a fair bit and even if measured may later change. Also lamp manufacture is not always precise and that a lamp may have an actual wattage several percent higher or lower than the nominal figure quoted. In practice a 240 volt 750 watt lamp should be OK on a 3.15 amp fuse, but fuse life and reliability may be marginal especialy if the nominal 750 watt lamp is in fact 780 watts and the presumed 240 volt supply is in fact 250 volts. Keep spare fuses to hand ! Link to comment Share on other sites More sharing options...
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