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  1. Karin

    larger than usual 2 gang KO box?

    hi all, not been on here much recently as i've been away from electrical work a bit due to injury (not from work :p ), but got a quick question for more experienced eyes than mine. got a message from a friend wanting to find a blank plate for a flush metal box with the dimensions 100mm x 160mm...
  2. Karin

    sunday shock scenario

    ok so this is a scenario that i read on another forum that interested me. the solution wasn't mentioned. shock received from shower tap while standing wet feet on tiled floor. testing from the tap (PME earth via bonding) to a screwdriver in the garden (true earth) showed a potential difference...
  3. 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...
  4. Karin

    Checking 110v Transformer (pat Test?)

    got given a 230V-110V site transformer today. probably reasonably old and been sitting in a garage for a while. so thought it'd be an idea to run some tests on it before chucking it into service? i'm thinking that after an inspection for condition and obvious damage (even inside the case), i...
  5. Karin

    More Earthing Clarification!

    as usual, further reading brings up more questions than answers but i feel like (hope!) different pieces are starting to click together! a) is one reason we are cautious with using TN-C-S earthing outdoors due to touch voltages that can occur between MET/installation earth and terrafirma/true...
  6. Karin

    Potential Difference Between Neutral And Earth

    evening guys, i think i'm gonna need this one spelled out to me a little if anyone can help. everytime i think i've worked it out i just start to doubt myself and go in circles! double pole isolation is required for TT but not TN systems where neutral can be said to be reliably connected to...
  7. Karin

    water heater fault finding

    evening guys, the forum has been reminding me it's been a while since i posted, but everytime i think to post about something it turns out most everything is actually in those yellow tomes and associated texts if you actually look for it :lol: just looking for a bit of advice on faultfinding...
  8. Karin

    Master and Slave PIRs

    hey, for the first time i've recently come across master and slave PIRs in some of the corridors and rooms we've been second fixing. i've asked a couple of the installers and they didn't really seem to know much about them or why they would be specifically used, and i've struggled to find...
  9. Karin

    hey everyone

    hi everyone. i'm a trainee currently working in commercial/residential installations, while working towards my NVQ 2357. i've found the discussions on this site really helpful for broadening my knowledge and reinforcing my understanding of things, and look forward to getting involved. guess down...

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