cause

  1. P

    what is the MOST likely cause of high resistance when testing continuity of cpc

    hi guys, what is the MOST likely cause of high resistance when testing continuity of cpc? I know likely reasons could be loose terminations, bad terminations (e.g not all wiring strands in connection), dirty connectings, ect But what would you say is the MOST likely reason for the high...
  2. D

    A first for everything, never expected this to cause a short.

    Check out the pics above; this was a callout to lost power in a factory, found 2 phases out blown 200amp fuses and a quick Meggar confirmed a short circuit between Y and B phases and unusual low readings to earth. id already isolated all outgoings and main switch was off to busbars but still...
  3. P

    IR testing - results creep up!

    Hi all Why is it that on some circuit IR testing, the results shoot up to say 250 M ohms but then creep up towards a much higher value? I know that the results are OK, I just thought it may be some damp somewhere causing the problem possibly. Do you wait for them to stop creeping up or take a...
  4. P

    What is the cause of voltage drop within an electric installation?

    hi guys, what is the cause of voltage drop within an electricinstallation?
    • paulthemagpie
    • Thread
    • cause electric electrical electricians' talk installation voltage voltage drop volts within
    • Replies: 7
    • Forum: UK Electrical Forum
  5. 2

    RCD tripping dilemma

    Hi all, Cam across a tripping 63A RCD, which is protecting pretty much everything in an office and even the lighting! The first guy who came out seemed to think that perhaps a spur feeding a AC unit was the culprit and proceeded to change it over, but I didn't really see the point in that. I...
  6. R

    Off the shelf RCBO's

    Morning guys, can anyone tell me what rcbos will fit in the place of an old wylex board. The mcbs say NB30 NB05 etc on front face of them. Cheers
  7. I

    adding new circuit

    hello when adding a new circuit (via spare way) to a existing CU with a 30ma rcd main switch (we cant change the board all the time or fit rcbo), do you note as a deviation on cert re (regulation 314) or not write anything ? many thanks
  8. B

    house alarm trouble

    hi all just wanted to know if anyone knows a quick method of silencing a bell box even when the main panel is disconnected and the main battery is disconnected just thought i would ask cause my neighbours are not happy ps im not able to reach the bellbox(no ladders) DOH!!!
  9. S

    Could PAT testing cause damage??

    Hi, We had PAT testing carried out the other day and since the engineer left... one of the laser printers in the office has packed up. It powers up ok, and the green LED indicating its ready to print is lit... but it hasn't printed a page since the guy tested it, and it won't print a test page...
    • seasonalbiz
    • Thread
    • aus cause damage electricians' talk pat pat testing testing
    • Replies: 37
    • Forum: Australia
  10. J

    research electrical fire cause

    Hi all, I am currently undertaking research into electrical cause of fire including distribution systems and appliances. If anybody is willing to share experiences, knowledge and or images showing fire cause, particularly in the early stages of the fault condition I would be most appreciative...
  11. C

    Voltage spike

    Hi Can anyone tell me whether a normal rail mounted lighting contactor can cause voltage spikes?We have replaced 4 emergency gear trays on a site in the last week, 2 of them have only lasted 24hrs!!!The new fittings have electronic ballasts.....just trying to find out what's going on!!!!!Have...
    • CH123
    • Thread
    • aus ballasts cause circuit contactor electricians' talk spike voltage volts
    • Replies: 3
    • Forum: Australia
  12. A

    TT high ze - rcd tripping

    Had a look at a fault for a mate, cooker kept taking out main 30mA rcd when switched on at cooker switch (no load, just turning on at wall) Disconnected cooker, turned on all ok. Cooker faulty? Had it tested and it was fine. Tested circuit, megger, r1+r2, all perfect. Went to do zs and...
    • ash_s3
    • Thread
    • aus cause cooker electricians' talk rcd rcd tripping replacement tested tripping
    • Replies: 11
    • Forum: Australia
  13. L

    Can an upstream fault cause an RCBO to trip?

    Fellas Scenario - 1 main three phase board feeding 3 further three phase boards with each of those feeding 15 single phase boards containing only two final circuits each. The fault is on the final circuits, ive tested the final circuits and all clear, can a fault on the distribution circuits...
    • LlandrilloSpark
    • Thread
    • aus cause electricians' talk fault rcbo trip upstream
    • Replies: 30
    • Forum: Australia
  14. D

    UPS and three way bypass switch...

    Don't know if anyone can give some insight on this: UPS and a three way bypass switch:<br>Position 1 - &nbsp;Normal (UPS Power)<br>Position 2 - &nbsp;Bypass &amp; UPS (Mains Power / UPS On)<br>Position 3 - &nbsp;Bypass (Mains Power / UPS Off)<br><br>What could overload the UPS and cause it to...
    • drcat
    • Thread
    • bypass cause electricians' talk position power spark switch three three way ups
    • Replies: 2
    • Forum: Talk Electrician Forum
  15. N

    Circumstances that cause emergency lights to switch on?

    Does anybody know if during a fire the highest risk factor that would cause emergency lights to be operated would be a) an open circuit (before the lights) eg ceiling collapse, melted coper conductors, etc or b) a closed circuit causing the mcb to trip eg melted insulation leading to short...
    • NoSparks
    • Thread
    • aus cause electricians' talk emergency lighting lights switch
    • Replies: 1
    • Forum: Australia
  16. P

    What would cause this MCB problem?

    Something I haven't come across before and now its bugging me. Here is the situation. 3 phase type C mcb protecting an air con unit. The area gets a blackout for 30 mins or so, when the DNO restore power the mcb didn't trip but when tested no current was going through any of the phases on...
    • Paul.M
    • Thread
    • aus cause electricians' talk mcb problem
    • Replies: 5
    • Forum: Australia
  17. J

    what may cause LV track system to.....

    blow all its bulbs in the 1st 20mins of turning it on??
    • james king
    • Thread
    • aus cause electricians' talk system track
    • Replies: 2
    • Forum: Australia
  18. L

    RCD tripping - testing for cause

    I've had a couple of these jobs now, found a garden shed wired into a ring with appliance flex on one of them - nice job But the one today is a bit bigger a commercial yard - if it's raining the RCD starts tripping at about 5pm. So I know I'm looking for and from what he's told me I've got a...
    • leolec
    • Thread
    • aus cause electricians' talk rcd rcd tripping testing tripping
    • Replies: 14
    • Forum: Australia
  19. S

    Volt drop effect on appliances

    Hi Guys I have a question regarding volt drop. Some time ago a company I worked for installed wall mounted aircon units around their workshop. They wired them into an existing 2.5mm ring main circuit which was in singles in a truncking. During operation some of the units would cause the...
    • Surefire
    • Thread
    • appliances aus cause current effect electricians' talk resistance units volt volt drop volts
    • Replies: 7
    • Forum: Australia
  20. Amp David

    Whats the cause?

    Had a customer mention to me the following issue he has. They have no mains water, so have a pump that keeps 2 supply tanks filled. He tells me that every now and again the pump stops working and he has to reset it. According to him its caused by the power going of because the clock on the...
    • Amp David
    • Thread
    • aus cause electricians' talk whats
    • Replies: 12
    • Forum: Australia
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