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power supply

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  1. ArkBigFoot

    DIY Security System Do I need Steping Power Supply

    I am making a security door system with reed type magnet switch. I have tried it on my desk and it works. I can set the time to stay on for several minutes. I was wanting one which would stay on even if they closed the door back quickly. This does that. My questions are: Do I need a stepping 12...
  2. M

    Help with installing a Timer on a Power Supply.

    Dear Friendly Electricians, I am an IT specialist. I am currently in a sticky situation. The company I'm working with is a digital advertising company. We have LCD screens to display ads. They asked me to install a timer on the screens. So they turn off during the night when the mall is closed...
  3. D

    Nest 3rd gen thermostat power supply

    Hi, I've got the thermostat nowhere near the heatlink to supply 12v, so currently using the usb power supply. This means that it's cannon fodder for a toddler... I was hoping to wall mount it and supply it from a light switch via a 12V transformer mounted in a back box behind it. Would supply...
  4. T

    Need help matching power supply to LED project.

    Hello, I am an artist in Portland Oregon and I need to power an array of 3 watt cob leds (9-12vdc 260-280ma) https://www.ebay.com/itm/311651957952 They need to be strung in strands of 8 (12 total strands) 96 total leds. I would like to run them a little underpowered to reduce the heat and...
  5. P

    Wiring car stereo to power supply

    Hello all, I hope I've found the right forum to post in... I am trying to put my old stereo in my new van. The one part I am a bit apprehensive about Is powering the thing up. I have two leads that I believe need power, one that says 12v ignition switched and one that says lighting or...
  6. T

    Commercial fridge Titan XTO-40-G power supply

    I'm having a hard time reaching this manufacturer for answers. Can someone help me try to use the following product? Titan open air refrigerator voltage 220 amps 8.5 hz 60 phase 1 plug type NEMA L14-20 I'm facing 2 issues, the plug type is not common, I believe it is a twist and lock type and...
  7. M

    Power supply for doors

    30 magnets (doors NC) is connected to an I/O device in a cabinet. Will a 10A power supply to the cabinet be enough, when each is drawing 95mA. Or should one get a bigger power supply to be safe?
  8. A

    LED Power Supply (Constant Current) suitable alternative help

    Hello, Can anyone offer me some help and guidance please, I'm struggling to source either the same direct replacement LED power supply or another that will work in it's place, to replace the one pictured. I need to buy three as all need replacing. Appreciated.
  9. D

    Garage Power Supply Problem

    The power to my garage is supplied by a fused spur in the house. When switched on the fuse in the spur blows and the RCD trips! I found that a live wire had loosened and was hanging out of its connection! Could this be the cause of the problem?
  10. J

    Testing an Uninterruptible Power Supply

    Hi, I'm looking for some advice on the results I got from testing a 1000VA UPS in use in a small business. With the permission of the owner I had switched-off and disconnected the PC it was intended to protect. Firstly, it passed all tests except the differential leakage test. Is it normal for...
  11. M

    Electrician Jobs Power supply build needed.

    Hi folks. I'm learning bits and bobs here and there about the mystical +/- that's all around us, but not enough to tackle this problem. Please don't ask why, (!), but here is the project... A 128 raspberry pi cluster. The raspberry pi is one of these newish micro board pcs. The Cluster or...
  12. A

    ASHP pump compatibility with power Supply

    Hi All I’m new to the group and not actually an electrician. But please don’t hold that against me! I’m after some advice please. I’ve come to a point in my building renovation where we are about to install a heat pump. Stiebel Elton WPL 25AS the forms for the pump had been filled in and sent...
  13. D

    Diy portable power supply

    Im a joiner and as one i need powerful tools, i had a crazy idea to use my li ion batteries in series to run 240v universal motors i have tried 2 18v batteries in series so far and it works but i want to make something that is safe, im thinking running an earth cable into a plug and just using...
  14. L

    Single Phase Load Estimate to Three Phase Power Supply

    Hi Everyone I would be glad if you could clarify this for me: For a Load Estimate Survey whereby 95% is single phase, the Load Estimate is 90 KVA (Single Phase). However, the power supply is three phase 4 wire system. To calculate the current per phase, the 90 kVA is divided by three i.e. 30...
  15. J

    What is the best was to splice electrical wire to power two components? (Arcade power supply and LCD

    Hi! I m doing my first build of an arcade machine. At the back of the arcade cabinet will be an IEC socket for mains power. Inside the machine I then need to split the electrical wires so that the one socket can power both the power supply for the console board (standard jamma power supply) and...
  16. U

    One power supply 2 devices - help with switches needed please

    hi all, I'm making a hopefully simple easier pump system to do small water changes on my reef tank. I need some help please to confirm my circuitry so I know I'm using the right switches ratings etc I'm going to be using the following: 1x 12v 1amp DC power supply Connected too 1x emergency...
  17. S

    Power supply to 380V pumps from 460V panel

    Dear all, We have 460V MCC panel for existing pumps in our plant. We need to give supply to new 380V rated pumps in the same panel. There is space available in the panels(Out of 9, one panel almost free). So please suggest is it possible to make the arrangement for MCC feeders in the same...
  18. D

    Exhibitor Power supply adaptor at NEC

    Hello I will be an exhibitor at an exhibition to be held at the NEC early next year. I am going to display multiple specialist outdoor LED displays. All of my displays are wired with NZ plugs. I know that I can buy and use a UK to NZ travel adapter at any airport in the UK so there must be...
  19. S

    24volt DC power supply for defibrillator

    Hi gents, I am after a bit of advice on sourcing a 24volt 70watt DC power supply for a public accessible defibrillator. Do you think either of these would be suitable; 1) http://uk.rs-online.com/web/p/din-rail-panel-mount-power-supplies/0428445/ or 2)...
  20. M

    Power Supply to Shed

    Alright team! Can somebody please point me in the right direction? Looking to run a SWA cable to my shed from my garage in order to power 1 double socket and 2 LED lights. Shed is less than 10 meters from garage. I plan to run the SWA cable directly to the socket then from the socket to a fused...

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