times

  1. 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...
  2. 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...
  3. 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...
  4. 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?
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. 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.
  12. 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!
  13. 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...
  14. 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
  15. 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
  16. 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
  17. D

    suppliers fault

    hi, Popped round in laws house last night as they were having power loss issues. As I pulled up noticed the utility guys on their road hard at work sorting it out. So out of curiosity I thought I'd check the voltage readings as they had power but you could tell the voltage was low. I was...
  18. S

    Disconnect times for adiabatic

    Am I right In assuming that as long as you have worked out the fault current from a zr that meets regs for the breaker you can just use the disconnection time of 0.4 etc instead of using the graphs which I can never seem to understand
  19. F

    rcd tripping times

    just a quick one doing some rcd tests today, and at x1 value the tripping time was 46mseconds and at x5 29mseconds now i no that as long as at x5 value is under 40mseconds all is ok just thought the x1 value was a bit high so my question is there a max value for times 1 as i must admit not had...
  20. S

    Voltage Stabiliser

    Hi all, do any of you have any experience of voltage stabilisers? Can they be fitted on sub-mains, or do they need to be at the origin? Thanks in advance

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