loop

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  1. Mark Wright

    Max Earth Fault Loop Impedance for OverCurrent Devices Before Amendment 3 and Now???

    Maximum Earth Fault Loop Impedance for OverCurrent Device was calculated 230/(MCB Rating*5) * Rule of Thumb is that correct? And how are they worked out now after Amendment 3?
    • Mark Wright
    • Thread
    • amendment before devices earth earth fault loop impedance fault impedance loop loop impedance max overcurrent
    • Replies: 5
    • Forum: UK Electrical Forum
  2. R

    Switch loop capabilities?

    Howdy, First encounter with switch loops. First situation is I have two lights that are apx 6 feet apart from one another and are on the same breaker. They have their own switch and both appear to be switch loops. The switch receptacle has two cables going to it that are 2.1(black white bare...
  3. D

    Loop at switch landing light

    Hi, had rewire, but didn't spec landing light that could be switched off from downstairs etc doh. Sparky said it's an easy thing to do, but will need to use wago boxes as he said no way to get all cables in back box even though they are deep ones. Mrs wants double gang, ie can switch both lights...
  4. M

    Loop Impedance tester electrical circuit

    Hi A quick one I was wondering if anyone knows how a multifunction tester performs a loop impedance test. I understand how to perform a test and what the results of a loop impedance test give you in working out your PSCC and earth fault current. I use my Fluke multifunction tester every day at...
  5. R

    Testing Loop Impedance through RCD.

    Hi, installed some circuits in a factory. The circuits were tapped off of a busbar that goes straight to the main switchgear. From this I installed a Chint RCD, which then goes to 2x Chint TP MCB and 1x Chint SP RCD. One of the TP MCB´s goes to red commando sockets and the SP MCB goes to blue...
  6. A

    Earth Fault Loop Impedance Test for lighting circuits

    Hello guys, Do you do Earth fault loop impedance test for lighting circuits during periodic inspection ? do you measure it at the lighting point? what is the percentage of lights you test? Thanks alot in advance
  7. D

    Fire alarm loop test

    How to perform this test and it's resulted meaning
  8. B

    Loop Ceiling Light

    Hi, I am installing a new ceiling light. I know there s the wires from previous light and wires to next light and switch cables . One of the sets has two brown wires so not sure about these . Any help would be great . Thanks
  9. J

    Earth Fault Loop Impedance...

    Hi there, I’m just hoping someone could clear something up for me at all. I’m just working my way through some test questions and I’ve come across one in which isn’t making sense to me. Q. Calculate the maximum earth fault loop impedance permissible for a 30mA RCD used to protect a circuit...
  10. D

    Megger loop impedance irregularity

    Hi, I have a Megger mft1720 and the low current loop test isn’t working properly. Just wondering if anyone else has had issues? Readings are stupidly high compared to the high current test, and this can be made even worse if there’s an rcd in line......
  11. D

    Live Loop in the switch, how to extend?

    Hello, another can of worms that I have had the misfortune to find. The Mrs decided to take out a wall, and we need to move the existing light switches. I thought it would be a simple job but it looks like the switch has the live loop running through it. I need to move the switch and just...
  12. M

    Excessive earth fault loop impedance

    I work for a hotel chain and recently we’ve had our 5 yearly test they have 8 circuits from our LV panel with excessive loop impedance readings !! So apart from either introducing an rcd or dropping mcb ratings or type is there any other way of achieving satisfactory readings ?? Also if I have a...
  13. S

    Earth fault loop impedance

    Morning all. So just trying to refresh my grey matter but having a biff moment. Earth fault loop impedance with circuits protected by BS EN60898 type B circuit breakers. I know the tabulated values are in table 41.3, but for the life of me I’ve forgotten how to calculate if acceptable or not. So...
    • Sean McD
    • Thread
    • earth earth fault loop impedance fault impedance loop loop impedance
    • Replies: 4
    • Forum: UK Electrical Forum
  14. G

    I need advice with light loop

    Hi, I have just taken my light down to replace with a new one and noticed that the new one has no connection for the loop. Is it okay to just join the loop in a choc block inside the fitting, or do regulations state otherwise?
  15. spud1

    Is it now a requirement to loop in at the switch?

    Hiya! Is it now requirement under the 18th to loop in at domestic light switches to provide a neutral at the light switch for electronic or indication functions on switches, or did I dream it? If so I take it/hope this would only apply in new build? Cheers Spud.
  16. Edward Morris

    Replacing loop in at switch with WiFi switch

    good evening. I have recently acquired a Sonoff T1 UK wifi light switch which requires a neutral wire for permanent power to the switch electronics. I would like to fit it to a 1-gang 1-way switch that I currently have in my bedroom, which is switching two light roses. The house is modern and...
  17. B

    Loop in and out at switch

    Hi, looking to wire 3 gang switch loop in and out method 1st switch is One way 2nd switch is One way 3rd is Two way With my loop in, I go from 1st switch COM and link to 2nd switch COM then link to 3rd switch L1, all neutrals in a wago with my loop out in L1 also, then 1st switch T+E to light...
  18. Prytaneion

    Robin 4112 Phase Earth Loop Tester

    Hi Y'all, Any kind sparky know where I can get a manual for a Robin 4112 Earth Loop Imp Tester? Tried all the usual with no luck. Thanks guys.
  19. LewisM

    6A MCB Tripping on Earth Fault Loop Impedance Test

    Hi, just finished a partial rewire at my sisters house and when testing the two lighting circuits (up&down) the 6AMCB trips for both circuits individually, I thought the MCBs might just be sensitive to the test but the smoke alarm circuit also 6A is fine when testing, R1+R2 and IR test all fine...
    • LewisM
    • Thread
    • earth earth fault loop impedance fault impedance loop loop impedance mcb test tripping
    • Replies: 6
    • Forum: UK Electrical Forum
  20. Gary Tollison

    Earth fault loop impedance, initial verification, multiple DB

    Hello. Not sure if this is the correct forum to post this in (still trying to work out where the trainee section is). Just been doing some practice fault-finding online. Found this scenario: After doing initial verification on an outbuilding with its own DB, which is supplied from the main DB...

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