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loop

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  1. D

    Do I need a JB here? Will terminal blocks do?

    Long story short - I'm moving a light fitting. Previously it was a pendant with the loop-in in it, this new light fitting doesn't have enough blocks inside (common scenario it seems), plus I'm moving it about a foot. So I need to take care of the loop-in before coming off it to the light...
  2. D

    UK How to extend the wiring loop

    I have recently moved into a house and am giving it a full refurb. The wiring in one of the rooms has me stumped! I found a junction box under the floorboards and found that the only plug socket in the room was spured off this too (now removed). The two wires on the right go one direction into...
  3. S

    High no trip earth loop readings

    Hi, I'm buying a new test kit and was wondering if anyone had a problem with non trip earth loop readings? This was taken on the same installation- new mk sentry split load rccb CU. I've got a secondhand, calibrated megger 1711 MFT which I've taken readings on a ring = 1.04 ohms And...
  4. M

    Loop tester different results

    Hello, I have a dedicated loop tester (Martindale EZ2500) and also a Fluke 1662 MFT The reason I have the additional loop tester is often at work I will need to measure P-E & P-N loop impedance only while I am in a harness climbing, or have walked for ages (large concert touring) the EZ2500...
  5. G

    Old Loop Circuit wiring to new light fitting

    I have a loop circuit in a 70's house and i am trying to fit a new light fitting to the old circit, i have wired it up so far so that the lights on the rest of the circuit work, but the one i am replacing doesnt work, please help, i have attached a image of the wires so far.
  6. 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?
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. 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
  12. D

    Fire alarm loop test

    How to perform this test and it's resulted meaning
  13. 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
  14. 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...
  15. 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......
  16. 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...
  17. 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...
  18. 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...
  19. 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?
  20. 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.

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