volts

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  1. N

    Voltage Drop Equation

    Hi, I've been doing some revison and came across 2 different equations for voltage drop. The first one is; Vd = mV/A x Ib x L divided by 1000 The second one is; Vd = (R1 + R2) x Ib x Multiplier The multiplier is to compensate the difference in conductor temperature at the time of the test...
  2. Midwest

    Voltage Tester

    I've done a search on above, but doesn't appear to be many recent posts. What make of voltage tester are you using. I have Dilog Combivolt, the lead from the main body has become exposed. Not very good with less than two years of service. Anything more robust?
  3. D

    Inverter / welder / 12volt 230 volt mobile mechanic van

    Hi I'm new to this forum and only posting because I'm stuck and cannot answer it myself I have a 2001 transit jumbo mobile workshop. I have recently bought a new welder and was trying to get it all rigged up I have a twin battery set up one for van starting and the other for aux in the...
    • Darren.salvage
    • Thread
    • electricians vans inverter mobile van vehicle volt volts welder
    • Replies: 12
    • Forum: Auto Electrician Forum
  4. Rincewindwiz

    LED ight string and Voltage Detector

    Hi All, I have a broken LED light string (I've two actually, one embedded in an Xmas tree and one standalone) . It seems these are wired in series so I presume that one or more LEDs are U/S. The challenge is finding the broken LED(s) and then what to do with them. I was prpposing to simply...
  5. M

    Smiths 4 wire low voltage PIR required

    One of theses PIRs has given up the ghost on my (very old!) security lighting system. Everyone I've asked tells me there is nothing compatible in todays market, so I'm hoping someone has got an old one gathering dust somewhere. I'll happily buy more than one if you've got any from an old...
  6. B

    Metrel instaltest giving strange readings when testing single phase voltage

    Hi everyone, I have a metrel instaltest that, when testing single phase voltage always returns a reading of 540 V on L1 L2 L3. This suggests an internal fault that it automatically thinks it's testing three phase somehow. Has anyone else experienced similar faults with Metrel gear? Thanks
    • Bryan Smith
    • Thread
    • metrel phase readings single single phase strange testing voltage volts
    • Replies: 4
    • Forum: Electrical Tools and Products
  7. S

    Ghost voltage

    Hi guys, what is the method you use to discharge ghost voltages, reason I'm asking is I have being given a job by a heating engineer who is saying they are getting 23v across the heating pipes, he has informed me that the voltage disappears when the lighting circuit is switched off which leads...
  8. Tiny Spark

    Fluke Volt Detection Pen

    Just picked one of these up today and was wondering if anyone else has one to compare mine to. Fluke 1AC-II Voltage Detector Pen | Voltage Testers | NoLinkingToThis Reason I ask is mine seems to be a little insensitive, Not like most others where it goes off when you are 6 inches away from...
  9. E

    Does 10 volts and 10 heartz make much of a difference

    Speaking hypothetically if I was able to buy battery operated tools from the Us of A and not pay import duty or postage would the charger still work?
  10. H

    voltage drop in 400V 3 phase circuit

    hi, can someone tell me if the volt drop max percentage for a 3 phase motor circuit is 5% of supply voltage ie 5% of 400V. thnks
  11. N

    voltage drop for a 9.5 kW shower

    Hello All, Domestic installation. Need some help please. A customer has asked me to installed 9.5kW shower. It is a new install. The cable I have decide on is a 10mm2 Flat twin and Earth. The shower is being install 24 meters from the consumer unit. The cable between the shower unit...
    • newuser31555
    • Thread
    • shower voltage voltage drop volts
    • Replies: 22
    • Forum: UK Electrical Forum
  12. M

    Volt drop

    Hi, Im a fairly new sparky, So just wanted to get a little idea as im not 100% sure, Im adding 12m of 1.5mm cable in trunking into a conservatory from a fcu of the ring main the volt drop for this part would be 4.5v so i may need to up the cable size. But what i need to know or confirm is what...
  13. Marvo

    High Voltage Fly Killer

    I have a cheap and cheerful UV fly killer which is probably a couple of years old. I noticed the other day that the high voltage side of things is no longer working so I dismantled it. Inside, apart from the fluorescent ballast which is still working fine there's just a single transformer...
  14. M

    Volt Free Switching

    Can someone offer me some guidance. I am wanting to keep the switching pair on two zone valves aswell as the switching pairs in a time clock volt free. Mainly so that 230V isnt flying around different wiring centres. Is there a way I can have volt free switching to pull a relay of some sort...
    • mstoker1990
    • Thread
    • free switch switching volt volts
    • Replies: 6
    • Forum: UK Electrical Forum
  15. D

    single phase 120/240 volt residential voltage problem

    I have a unique problem I have 120 volts to ground coming into panel on each phase and 240 across both. if I run a dedicated line to a outlet plug in a light or battery charger what ver I saw he voltage go to 70-94 volts and even 170 volts if i turn other breakers! what you all think I am stumped
    • Duaneb
    • Thread
    • neutral other panel phase power problem residential single single phase volt voltage volts
    • Replies: 9
    • Forum: UK Electrical Forum
  16. HappyHippyDad

    Odd request regarding phantom voltage!

    Afternoon all... I would like to experience phantom voltage!! Is there any way I can reproduce it so that I can test it? I know this might sound a little silly, and I realise my new Drummond test lamp would simply not light up if it is phantom voltage, but I would just like to see it for...
  17. S

    2volts on a disconnected cable?!?

    I've recently been sent to complete a re wire for another contractor and there is a cable which isn't connected to the consumer unit which shows 2volts on it! is there a reason for this? I'd it potentially dangerous? How can I correct it? It's on one leg off the ring main in the kitchen. Any...
  18. HappyHippyDad

    Voltage drop and it's effect?

    Hello all, just been thinking over Voltage drop!! 1. Where does the 3% and 5% figures for voltage drop (VD) come from? Appendix 4 (BS7671) gives the figures but why the different values between lights and sockets? 2. Also permitted voltage levels are -6% and +10% from 230V giving a min of 216V...
  19. S

    Voltage drop and current drawn

    Gentlemen I have a question for your perusal. A 3kW 230volt submersible pump is connected to a long extension cable (60 metres). Approximate current drawn is I=3000watts/230volts = 13amps (ignoring PF and efficiency). Cable is rated at 0.03 volts/amp/metre therefore the volt drop is 0.03x13x60...
  20. HappyHippyDad

    Analog voltage tester?

    Could anyone give me a link or tell me were to get an analog voltage tester? Just want to be prepared for phantom voltage! Cheers all :smile5:

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