volts | Page 5

volts

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  1. N

    Ring continuity voltage at dead test

    Hi guys doing a ring continuity test . R1,Rn,R2 values all okay. Done figure of 8. Tested at each point and not allowing continuity test due to 8 volts. Stuck on what this is? Any ideas ?
  2. J

    Voltage indicators

    Who uses and what are your main causes for false reading? I find they don't pick up voltage when cables are in cold conditions, any ideas why?
  3. B

    whats causing volt drop?

    hi i havint worked as an electrician for a good few years and a problem im having is wrecking my head. I came home last night and my lights seemed dim and where flicking (just put it down to bad weather) but when i turned my cooker on all my lights went out. after pulling the house apart i...
  4. 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...
  5. 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...
  6. 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?
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. 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
  12. 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...
  13. 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...
  14. Simonslimline

    Old voltage tester.

    Has anyone seen this model before. I know it's old but not certain how old. Am i correct in saying it has a solenoid inside it? It vibrates when a voltage is present on the probes.
  15. 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...
  16. 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...
  17. 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...
  18. 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...
  19. 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...
  20. 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...

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