voltage

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  1. Shafiq Azmi

    Why MCB and Fuse cant protect Voltage Surge?

    Hi Everyone, I got some Power Module damaged cause by Voltage Surge. My device protected by 25A MCB and Fuse. Why my device still damage although its already have the protection? Any other way to prevent this from happening again?
  2. D

    Voltage sensor on Charger

    What does the voltage sensor do for our car charging point? protect from surge or dropping power?
  3. F

    Low Voltage Dimmer Help

    I recently purchased these pathway lights: https://a.co/d/f08tuaE After installing them I realized they're too bright, so I installed one of these dimmers: https://a.co/d/3tf17Su The dimmer doesn't dim the lights very much. They go from extremely bright to very bright. They are on a 14v...
  4. T

    Metal ceiling grid voltage

    100 volts on a metal ceiling grid when measuring from the Met to the ceiling grid Only when lighting circuit (led panels ) is on it goes away if the panels are disconnected from the drivers and left on Each panel has 25 volts from met to screws on the back they are class 2!! So the voltage...
  5. B

    3 phase voltage drop calculation?

    Hi! Once you've calculated the voltage drop in Volts - you divide by 400V for three phase right? For example: three phase 30kW appliance, 10mm 90 degree SWA, 45 meter run. 30,000/sqrt3/400 = 43.3A = Ib from the table 4E4B, a 10mm cable gives 4.7 So then 43.3 x 4.7 x the 45 meter run gives =...
  6. B

    Single and three phase current capacity and voltage drop differences.

    Hi All, From what I understand, working out the design current - Ib for single phase is quite easy (max appliance power/voltage). For three phase, do I take the max power, divide by 3 then divide by 230 to get the Ib? (We definitely use 230V for everything right?) Now for voltage drop, We...
    • bbudding
    • Thread
    • capacity current phase single three three phase voltage voltage drop
    • Replies: 7
    • Forum: UK Electrical Forum
  7. S

    Load Balancing / Voltage stabilization

    Hello, I live in Mexico, where I have a small, un-official trailer park on my property. The property is serviced by my privately owned, 650amp transformer with two hot wires coming from the main lines on the highway. The transformer case is designed with a 3rd possible hot connection...
  8. M

    Low voltage switch question

    I'd like to wire a six pin DPDT rocker toggle switch to turn a low voltage LED fixture on and off. The rocker toggle switch I have is an on/off/on switch. Additionally, I would like to wire a photocell switch to this light, so it will turn on and off with the sun. What I'm trying to do is have...
  9. I

    High incoming supply voltage EV charger shutting down

    Hello, I have a EV charger that is reporting over voltage and is unable to charge. the charger will operate up to 253V The solar inverter reports voltages below 253V and when the solar is shutdown and isolated the incoming supply reports voltages in excess 248V consistently, peaking at 256V...
  10. L

    Car radio battery wire zero voltage ! but original car radio is working when connected. Why?!

    Hi everyone I am new in this forum and this is my first thread. Car model: Toyota echo 2004 sedan. I used a multimeter to test the car radio battery wire ( blue/yellow) when it was disconnected from the car radio, its reading was 0v. ( as shown in photo 1 ) before and after ignition, isn't it...
  11. KelvinGaliny

    Why live to ground voltage is only 0V (in a 220V AC power outlet, there is also electric shock)?

    Hello, my name is Kelvin. I'm a trainee hydraulic engineer in Indonesia. I apologize if this question has been answered before / if this question is too basic. So we have a problem with electric shock coming from an electric panel. This panel runs on 220V AC supply & is used to run an inverter...
  12. T

    Strange voltage on earth wire

    Hi, I've got a light with a ceiling rose in the kitchen. While rectifying some faults in the house I came across to the light and measure Neutral to live: 240 volts (which is fine ofc) however when measuring earth to live I'm getting 150 volts. I have checked for any touched wires with my Fluke...
    • TonyandCheeny
    • Thread
    • earth earth wire strange voltage wire
    • Replies: 25
    • Forum: Lighting Forum
  13. Sparkgap

    Super low mains voltage, what works?

    Some months ago the transformer feeding my road had a HV phase loss with the result that my house was only getting about 85V. It was interesting seeing what stuff worked and what didn't: for example, 60W bulbs glowed, fluorescent lights didn't(!), some LED lamps worked, others didn't, and my DAB...
  14. stopconsuming

    How can there be voltage on water pipes?

    Hi everyone, I need some help with an electrical issue I'm experiencing. I recently created a new circuit for an electric oven at my friend's place, and when I returned home, my friend called to say that the two water pipes connected to the boiler were smoking. When I arrived, I first measured...
  15. J

    What is the incoming Voltage Before and After the Service Fuse?

    I know that after the Henley Block which houses the Service Mains fuse, the Voltage is 230v If we was to remove the fuse and Measure the incoming Live wire, would the Voltage still be 230v?
  16. M

    Voltage drop sin phi

    Hi chaps, Been working though the electrical design guide and I'm stumped on reactive power. volt drop and the equations are easy enough but I have no idea where sin phi has come from or how they have calculated it at 0.6. Any help would be greatly appreciated
  17. T

    Induced voltage on twin and earth cable

    Why would I be getting 94v between cpc of twin and earth terminal at DB? Connected into rcbo with the other end 3 cores separated, nothing connected.
  18. J

    voltage experiment - Will it remain the same or change?

    If we have a single 100V Live coming in from the AC Transformer, at any point we measure its 100V If however we introduce loops, does this have any effect on voltage? What would be the voltage reading at the following points on the image Purple Pink Green Im wondering does it have any...
  19. T

    Insulated Terminal Voltage Ratings

    Hi, We are working on a Solar installation in the UK and have been asked to replace the string cable terminations, 6mm² yellow insulated ring terminals that are bolted to a common busbar. The reason stated is that the insulated terminals are not rated for the string voltages, 1000Vdc STC. Having...
  20. R

    Low voltage light mystery

    I have undercabinet lights that are low voltage. They work xenon pucks just fine. I want to convert to low voltage LEDS. Supposedly these are 12V DC but when I hook 12V DC LED pucks up, they don't work. There is a switch to turn these on that is 120 volts. Somewhere buried behind the wall...

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