volts

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  1. D

    230 volts between N and E in lighting circuit

    Hi folks. I'm wondering if anyone can help with a lighting circuit fault I came across today that has me slightly baffled. I have a circuit consisting of about 5 standard pendants and 3 fluorescent fittings. The original problem was in relation to a 6 ft fitting needing new starters/tubes...
    • Decky
    • Thread
    • between circuit lighting lighting circuit volts
    • Replies: 11
    • Forum: UK Electrical Forum
  2. G

    12 volt timer

    Hi, I've just bought a small 12 volt digital timer to use as part of a lighting set up for some hen cabins. This particular one is a 16 amp YNAP model YP109A, there are lots for sale on the internet but most appear to be model CN101A which appears to be identical but only 10 amps I think. The...
    • Golman
    • Thread
    • button press timer timers volt volts
    • Replies: 4
    • Forum: DIY Electrical Advice
  3. M

    Alternator giving out high voltage but low current. Why??

    My friend's alternator (Lucas 40A I think) is connected to one battery. It does get excited and produces 14.4V, and it gave out about 15A for a few seconds, but then the current went down to 3A within one minute, which is too low. What are possible causes of this behaviour?
    • mascip
    • Thread
    • alternator battery current high voltage out voltage volts
    • Replies: 14
    • Forum: DIY Electrical Advice
  4. S

    Lamp Voltage

    I am currently studying a HNC in building services. I've been asked to find out typical voltage usage for the following lamps. Standard Incandescent Lamp Halogen Incandescent Lamp Fluorescent Tube High Pressure Mercury Vapour High Pressure Sodium Low Pressure Sodium Metal Halide LED If anyone...
    • Shaun O'Brien
    • Thread
    • lamp lighting lights voltage volts
    • Replies: 9
    • Forum: UK Electrical Forum
  5. S

    Voltage between Neutral and Earth

    Hi guys, came across a fault yesterday on a job where I was getting 15v between neutral and Earth at two sockets on a ring main.if u need anymore details let me know. i am unsure what would cause this and want your expert opinion as I have never come across this problem. the installation is an...
  6. Lee Gold

    Star and delta phase voltages

    I came across a question today in my paper asking me to draw out star connection and a delta connection and draw out phase voltages on star from phase to phase and write in the voltage and I don't understand it at all can somebody help please. Star carrying 240/400v delta 400v Sorry I'm not...
  7. L

    Volt drop

    Hi I've a few questions regarding volt drop. Apologies if its a little longwinded but I'd like to get my head around everything. An example scenario is a section board with a TP sub main to lighting and power board (DB2) Calculations for circuit : Supply Voltage = 400 Volts Ib - Design...
  8. A

    Calculating power factor with wattage and voltage

    Hello, I really need to know if it's possible to calculate the power factor from the voltage and the wattage... For example... 13kW, 400 V three-phase machine Thank you
  9. A

    Insulated Neutral Voltage Stree

    This question is to help my understand of an insulated neutral system and what happens during an earth fault. I understand that the system is earthed through capacitance, and that voltage will charge and discharge through the fault. This will cause voltage stress in the functioning phases due...
  10. Flanders

    110 volt 16 amp sockets on a 32 amp ring

    When caring out an EICR on a site I found that the 110 volt socket outlets were connected as three 2.5mm ring final circuits each protected by a 32 amp MCB (single Pole) in a DB fed from 110 volt transformer ,These sockets are used to supply halogen Flood lights that area plugged in when...
  11. andyb

    VFD Volt Drop Question

    I need a help from those on here with experience with 3 phase motors and VFDs. I have been asked to install the cable to supply a couple of pumps that will be controlled using a variable frequency drive. As they are submersible pumps they come pre wired with 12 core 2.5 rubber cable, 10 cores...
  12. Y

    DC Volt Drop Calc

    Hi all, I appreciate this has probably been posted to death but the search wont load on my phone. I have to calculate for Volt drop in a DC circuit, There's next to no load (2 amps max) the cable is 4mm pvc twin, and ln a loop from the control unit to the loads. OveralL Length 50m Is the calc...
  13. S

    Stalled motor and volt free contacts on VFD.

    The motor has stalled (trip name StLL) after someone tightened/overtightened screws on flange mounted gearbox. Volt free contacts on Parker SDD 650 frame 1 were still closed (assigned to close only when motor is running). They should open cause they are in series with the contactor coil of...
  14. C

    Transient voltage fault for NVQ

    Hi guys Doing my NVQ and have to locate and fix a transient voltage, after speaking to my assessor we agreed i was unlikely to come across one before my time was up and very very unlikely to come across two on different occasions. So not sure what we will do yet, maybe a simulation in the...
    • Callum Jackson
    • Thread
    • course electrical nvq fault nvq training voltage volts
    • Replies: 10
    • Forum: UK Electrical Forum
  15. D

    Voltage Drop?

    Hi this is my first time on this forum so take it easy please but I'm after a little bit of advice... I wonder if someone can help me calculate the voltage drop of an install that is in the process... I will give you as much info as possible, any help would be greatly appreciated... .400a main...
    • Dan-R
    • Thread
    • appreciated cable install panel voltage voltage drop volts
    • Replies: 3
    • Forum: UK Electrical Forum
  16. L

    Low Voltage Help

    Hi all just looking for a few ideas from you all. Just received a funny call from a plumber saying that he has a problem with the electrics on a clients boiler system. He explains that he only has 12v at the control center where he should be expecting 240v. I told him to chase back the circuit...
  17. T

    Voltage drop/ Cable size query

    Hi All, Quick brain pick. If I don't care about voltage drop (eg. all components on the circuit will run between 100-250V) and current capacity is within limits, are there any other considerations when deciding to use a smaller than 'normal' cable size? 200m run - 10 x 300w loads equally...
  18. robd

    Hot tub volt drop

    Hi All, Been to look at a job with a hot tub 27A load, 30 metre run. Don't do much volt drop calculating but here's what I did, anyone disagree? Thinking 6 mm armoured so: 7.3x27x30/1000=5.91v max permissible (5% of...
  19. rustynails

    Accessibility of a low voltage transformer

    Have come across a low voltage transformer which has been placed in the ceiling above a shower not accessible at all which means the customer cannot change the time period on the overrun. I can't find anything in the regs that says the transformer needs to be accessible. Anyone have any thoughts...
  20. ses

    Fluke t150 voltage testers

    Brand new fluke T150 voltage testers for sale in packaging Collection west london or postage at £5 These retail at £88 online Bargain at £70

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