resistance

  1. buzzlightyear

    micc on rcbo

    micc on rcbo will not set
  2. J

    Insulation resistance testing Lighting circuit

    Hi everyone. I'm looking for advise on how to test IR on commercial lighting. There's so many lights on 1 circuit , do I have to take out all the lamps in all the lights to perform the test or can I simply test between LN -E ? Even though I have spent lots of time testing domestic installs and...
    • Joseph Lewis
    • Thread
    • circuit disconnect insulation insulation resistance insulation resistance testing lighting lighting circuit neutral neutrals readings resistance testing
    • Replies: 7
    • Forum: Commercial Electrical Advice
  3. gazdkw82

    Missing resistors

    for some reason I'm struggling with resistors more than anything else in the electrical science (202/203) course material. I have a table with 6 examples, each having 3 resistors in parallel and a total resistance. Problem is a lot of the figures are missing and the question asks to find the...
  4. gazdkw82

    Parallel resistors

    I'm getting conflicting information regarding parallel resistors. I originally thought the below was how to calculate total parallel resistance 1. Rt= 1/R1+1/R2+1/R3 2. 1/Rt However in my pre exam workbook it says to 1. Calculate Rt as 1. above 2. Find the lowest common denominator 3...
  5. Karin

    resistance testing

    afternoon all, been reading up on testing and just wondering about the different types of testers and how they work.. insulation resistance - creates a potential difference across two conductors and measures leakage current to calculate resistance in MegOhms? low resistance ohmmeter - i've...
  6. C

    Fault Current Distribution

    Hello All, 1.Star connected earthed neutral Source to Star connected earthed neutral load? Say if a L-G fault occurs between the source and load, How does the fault current gets distributed? To the source side neutral or load side neutral? 2.Star- Star Transformer. Neutral earthed on both the...
  7. B

    Insulation resistance

    Is this right anyone? So basically I'm gonna test the whole consumer unit with an insulation resistance test rather than every circuit would you do basically I need to show my college and I've only been testing since last week and need to show an insulation resistance test of the whole board and...
    • Bradley6969
    • Thread
    • consumer insulation insulation resistance resistance switch switches
    • Replies: 2
    • Forum: Lighting Forum
  8. B

    Insulation resistance test help

    Hi I want to test the whole board at once with an insulation test so turn off main isolator and breakers turn tester to 500v? And is the best thing to do, the incoming tails L+N put in a link between them and connect your probes to the link and other to earth also can you still operate light...
  9. Pete999

    Resistance explained

    Well I never knew that
  10. D

    Insulation Resistance - Head Scratcher

    Hi folks, Was sent out to a job today to add in a hot water pump underneath a kitchen sink in a kitchen that had recently been done up. Took with me just a socket thinking that the electrician doing the kitchen work would have RCD'd it - but no. The woman had her own joiner do the work so I'm...
  11. sparky1508

    Insulation resistance problem

    Hi all, I have done an insulation resistance test on a ring final circuit today and when I do L - N I'm getting 0.01Mohm. Checked all sockets for loose connections but found nothing. I plan on splitting the ring tomorrow and testing each individual length from socket to socket. It's gonna be a...
  12. F

    Insulation resistance test on a db supplied via a time clock

    Hi guys new to this website just a quick question as it has been a while I have a small 6 way distribution board this only becomes live via a time clock supply wired into it I'm going to be testing this board with a IR dead test on each circuit just to make sure according to guidance note 3 & on...
  13. J

    Low Insulation resistance readings when connecting final socket on ring?

    Hello All wondering if anyone could shed some light on a problem i have with my IR readings. I recently rewired a house.. took care pulling cables in etc . finished 1st fix, checked cables by looping ring main in connector blocks and doing continuity and IR test . continuity was ok, IR read...
    • Justintime
    • Thread
    • conductors connecting fault final insulation insulation resistance readings resistance ring socket sockets testing when
    • Replies: 16
    • Forum: UK Electrical Forum
  14. S

    Insulation resistance problem

    Hi all i was wondering if anyone could shed some light on my problem. Came to test a ring circuit today L-L 1.23 ohms N-N 1.23 ohms E-E 1.98 R1+R2 0.73 then i did my insulation resistance tests L-N 500 ohms N-E 500 ohms then L-E 0.00. Nothing plugged in, only a few sockets connected the rest in...
  15. S

    Trouble with an existing Pv system Schott Asi 105w panels

    Hi Guy after your best advice, been along to see a customer who is having trouble with his system which has been up and running for just over Four years and the original installers are no longer in business. He has approx a 17kw system of Schott Asi 105 w panels on the roof Appox 162 info...
  16. rolyberkin

    Earth Resistance Tester

    Any suggestions on an earth resistance tester which will not break the bank? Anyone got or used one of these UNI-T UT521 Digital Earth Resistance Tester
  17. W

    Short circuit

    Sorry just learning but with a short circuit. V=i x r so dosnt that mean that the maximum short circuit in a circuit with even no resistance would be 230 Amps. How comes I hear of higher currents in faults and breaking capacity for the breakers are 6ka.
  18. A

    Using pipe work to bond to incoming water

    I have recently come across a situation whereby instead of running a main equipotential bonding conductor from the MET to the incoming water someone had instead ran a short bond from the MET to some copper pipe in the mains cupboard and clamped it and then placed a bond on the pipe near the...
    • atm84
    • Thread
    • bonding conductor electrical work incoming pipe resistance using water work
    • Replies: 23
    • Forum: UK Electrical Forum
  19. W

    Insulation resistance

    Basic question sorry,just isn't coming to me at the moment. Why can you close the switches foe an insulation resistance test wouldn't that cut off the circuit and not measure the resistance after that switch.
  20. joel89

    Rotary resistance starter advice

    hi all, just looking at upgrading a george ellison old fillled rotary resistance starter on our forging hammer (the starter is pre-war 1924) the contacts are worn and the mechanical lever springs are also worn been temp fixing it for a year or 2 now, the motor is a 3ph 415v slip ring motor (big...
Best EV Chargers
Best EV Chargers by Electrical2Go! The official electric vehicle charger supplier.

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Electrical Goods - Electrical Tools - Brand Names Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc

Advert

YOUR Unread Posts

Advert

TrueNAS JBOD Storage Server

UK Tiling Forum | Tilers Forums
UK Tiling Forum by Tilers Forums UK
Plumbers Forums | Plumbing Advice | Gas Forum
Electrician Tips from Professional Electricians
JBOD Forums: a forum for JBOD storage server advice
JBOD Suppliers: JBOD Storage Server Supplies
Back
Top