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  1. A

    Rcd issues

    Hi new to the forum, but got a feeling I may be on here quite a bit. I recently had to do a board Change at work due to the RCDs on the split load board not meeting the disconnection times. With all circuits put away across the 2 sides of the board and all in the off/open position I energised...
  2. D

    Insurance

    Self Employed Electrician Insurance trying to start off, As you know my English isnt that great so LAWER talk and Insurance sadly i was in the hands of the insurance company. As when i tried to join a Governing body, i tried Napit and went with Napit Insurance, what has another name that is...
  3. Z

    Verifying SWA CPC suitability disconnection times / adiabatic equation

    As you may know looking at some of my posts I've been thrown back in the deep end recently – and don’t have much experience with complicated calculations. As this is the first time I've used SWA to go from the main supply to the primary CCU, and as I'm using the steel armour as my CPC, rather...
  4. G

    Working times

    Hi guys Does anyone know what between what times of day you are allowed to work and make noise etc including the weekends. In domestic commercial sorts of premises where there are the public nearby. Always feel bad working late and making noise but was told that on a weekday between 7-9 was...
  5. B

    Ring end to end results not text book for cu change.. do we need to ensure 1.67 times

    Hi, Cu change pre tests (TT) indicate non text book results: r1=072, rn=0.92, r2=1.58 another ring: r1=0.67 n=0.67 r2=1.60 As can be seen the r2 values are more than 1.67 times r1 or rn possibly due to loose connections. Are we responsible to try and bring these values in line for a cu...
  6. H

    disconnection times for 100mA BS61008 on a tt system

    Gents, tested a pub split load db today in the sticks. before i commence any work, am i right in stating anything over 0.1 on the 100mA side is a fail? did a test on the man 100mA and its disconnecting in 0.25 I've tested the sockets on the 30mA side and they are disconnecting correctly. Pubs...
  7. W

    Mounting LED Drivers

    I’ve got a project which has 10 LED Surface fittings whichhave separate drivers and are DALI controlled. It’s not possible to put the driversnear the fittings and they need to be mounted centrally. There is no problem withthe cable length/ sizing between the two. The architect has suggested...
  8. G

    Earth fault loop impedance

    How does earth fault loop impedance and disconnect time requirements change for 3phase 3 wire 230 volt systems where the phase to earth voltage is 133 volts instead of 230 volts?
  9. Y

    New member - Advice on PIR Light Connections

    Hi, I'm new to the Forum and I'm a keen DIY enthusiast...bt only within the limit of my skills....so I'm after some advice. I am changing my PIR lights NOT the actual wiring circuit. I have two PIR Lights that are connected and operated by oneswitch (in the kitchen). The PIR light has wires...
  10. K

    Testing unit supplied from inverter

    Hello all, I’ve been asked a question which is puzzling afew people, so I’m trying to get a definitive answer. An organisation who I do some testing for is fittinginverters in vehicles so that laptops can be used. The inverters are wired intothe vehicles 12v system and a cable is plugged into...
  11. J

    d type breakers needing a low zs

    im a 1st year apprentice thats why im asking this question, from what ive gathered the higher the current it takes to trip as in 10 times the rated current etc... for that you need a lower zs than if it was a b type why is that? my thoughts on it is that becuase you have a higher current so...
  12. M

    Fused neutral cut-out

    Apologies if this isn't the appropriate bit of the forum to post this to, or for any uneducated comments in what follows - straying beyond my elec expertise! We had our meter changed over to a digital one the other day & the guy who did it spotted we had an old fused neutral cut-out. So Western...
  13. M

    Disconnection times with off grid application.

    Hi All New to this forum and fairly new to the business too. I have a project I'm putting together which is an off grid house. There are two 5000VA inverters with sufficient battery size and a sizeable generator to switch in once loads exceed about 7kW, which will ADD a further 100A. Here's...
  14. M

    Earth leakage relay

    Hello, im looking for advice on a dorman smith sensel SRD earth leakage relay. I am doing an EICR on a caravan park, the Earthing system is TT and a sensel SRD relay fitted to load side of 200 amp main switch feeding various pillars. Relays have 4 settings from 30mA to 2000mA with time delay...
  15. T

    industrial coffee machine

    I've just purchased a 3phase 4.3kw coffee machine, i need to run it of some sort of generator, any recommendations on what generators would be best to accommodate this also at a reasonable price? Any feedback on this would be greatly appreciated.
  16. uksparks

    Stubbs Books

    Hi, Just thought id share a couple of photos with you, my stubbs books have just arrived! In the very box they were sent in back in 1954! Looks like I have a bit of reading to do!
  17. E

    Domestic - Best way to leave temporary power during rewire

    Hi all, apologies if this has ever been answered before, i only have 2 months post apprenticeship experience(i went travelling immediately after qualifying!) and about to start back in the trade as a mate. Something i have often wondered since i never done many domestic installs during my...
  18. J

    Rcbo's tripping times

    I am testing a new build installation of 90 flats all the flats have 1 16a Rcbo when I test the tripping times I get a higher reading at 5x than 1x on all 90 flats they r all wylex can anyone help me on this matter
  19. Lee Gold

    If your from birmingham

    Anyone from birmingham that knows of any colleges for adults that do evening courses in electrical installation that work around shifts? I mean I work 1:30-22:00 1 week then 08:00-16:30 the next week does anyone know if colleges work around this or don't they do them? Thanks
  20. M

    JIB Electrotechnical Certification Scheme (ECS) JIB Gold Card

    Hi all, How do I go about getting a JIB Gold Card? I have the following qualifications: NVQ Levels 2 & 3 AM2 17th Edition Do I need any other qualifications? ie health and safety etc etc Have asked a few people and getting different opinions. Pls help. Thanks

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