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unless

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  1. R

    If a type B MCB doesn't trip unless 5x nominal rating is hit, what's to stop the cable burning up?

    Just reading through my Student's Guide and wondering about nominal amperage. If guaranteed trip is 5x nominal amperage, what's to stop 2.5mm cable on a 20a radial circuit from running at 70a or something and completely destroying the cable/potentially your house?
  2. J

    Washer earth trips unless it is rocked back & forwards aggressively.

    Very appreciated forum. Washer earth trips RCCB unless it is rocked back & forwards aggressively. This is a struggle. One brush had worn excessively and tripped and changed. I wonder if there is excessive wear due to uneven commutator causing a pile of debris bridging to brush housing? Any...
  3. B

    Mini cooper s r56 turbo wont start unless i pull high pressure fuel pump plug off, 2 wired plug.

    As per title any ideas, car just cut out dead and will not start unless I pull the 2 wire plug off the high pressure pump solenoid. I also get no reading at all on the dianostic fuel pressure check. I have 72 psi when connecting my fuel pressure gauge to the line.
  4. B

    UK One security light not coming on unless the other is

    Hello all, my first post here and I'm looking for some advice. We recently moved house and the external garage has a couple of security lights on it. One of them works the other didn't. As they were quite old and the screws seized I was having trouble replacing the bulb (and sourcing a bulb) so...
  5. Dan

    COVID Update: Emergency Work is Okay; Sitework is Okay 2 meters apart, Work in customers homes in general unless emergency is a NOGO.

    COVID Update: Emergency Work is Okay; Sitework is Okay 2 meters apart, Work in customers homes in general unless emergency is a NOGO. I'm trying to find the video and or article where PM questions were extended. Kids who live with parents at two seperate homes can still go to both homes...
  6. S

    Nest wiring help - not controlling boiler on/off unless hot water set to heat

    1st post and I’m not a heating engineer/electrician so apologies for lack of proper terminology. It’s a long story but in essence I had a new conventional boiler replace 2 years ago (Worcester Bosch 28i) and had issues with way heating engineer wired up the new rf thermostat. Decided to fit a...
  7. N

    Printer not switching on unless fuse is flipped

    Good evening all. Despite of being utterly ignorant on the subject, I have an issue which tickled my curiosity and would like some assistance to understand. I have a printer (although I'm pretty sure it doesn't matter what appliance it is) that, sometimes, doesn't switch on. After numerous...
  8. A

    Petition: Make working with electricity a criminal offence unless qualified

    Hi, I found this petition and thought I should post it here. I googled the forums and couldn't find a similar post. https://petition.parliament.uk/petitions/122444 I'm not sure how good or bad the situation is in the UK, but I've heard and read enough to be worried. I read in more than one...
  9. 1capybara

    Flexible cords and HO7RN-F for fixed installations

    I read carefully BS7671, 17th ed., 521.9 and guidance note 1, Table F3 and F5, and no where does it say that flexible cords, such as HO7RN-F can not be used for fixed installations. I hear that was not allowed in the 15th edition but long since allowed. Am I missing something?
  10. S

    rcd or no rcd ?

    Does a 16 amp commando socket installed in swa in a warehouse need to be rcd protected ?
  11. P

    8.5kw shower

    Ok, cable under floor. 16m run. My calcs say 6mm tne Is adequate although on the limit. I don't want to run 10mm unless I absolutely have to Am I correct?
  12. T

    Xtrail No spark unless cam sensor removed

    Hello, I have a Nissa xtrail (petrol) that is refusing to start... It's a long story but ...two things happened more or less at the same time - 1. Timing chain jumped some teeth due to failed tensioner & 2. Crank Pos sensor developed a fault which somehow melted the connector block!. Timing...
  13. B

    sub main to outbuilding

    hi guys new to this so sorry if revisiting old stuff. I need to run a sub main 200M from the service head to a log cabin Super eco all LED etc, so 40A 9Kw max demand if i use the cable calculators i get 185mm cable we all know power networks cover huge distance with 35mm cable on 100A supply...
  14. B

    6a fan isolater or 5a fused connection unit for bathroom fans

    hi avery1 i notice few new houses got 5a fused connection unit controlling bath room fans,my q how do they do it if you have 3core cable +earth (timer fan) i always used (3polefan isolater l1 l2 N).:dozey:
  15. E

    Dedicated 32a2.5mm rfc for underfloor heating

    Hello all, doing rewire at the moment and i have pit underfloor heating on dedicated ring to save cable. No reason why not right? Conductors in parallel and all that. Not using fcu's just using stat as DP isolator. 7 zones/stats. Design current ok with Ref method B. Am I doing the right...
  16. Phil L

    typical customer

    In middle of rewire customer said they were doing some decorating told them to wait to Monday and I would loosen of the accessories so the could cut round them (all polished chrome) went out to watch the football came back and got a call saying they had a problem the lady of the house had got...
  17. I

    tripping rcd

    Hi All. I was called out today to a tripped RCD in a domestic split board that not would reset unless the main switch was off. All mcbs off, all phase conductors removed in case of stuck mcb but still no rcd reset unless main swith was off. Any ideas, householder was not prepared for more...
  18. W

    Breaking Main Fuse Seal..

    Hi everyone, I'm sure this topic has been risen plenty of times. I'm a qualified electrician and I am going to replace a consumer unit for a relative. I am not registered with NICEIC or NAPIT so will be getting it tested by the council. Can anyone explain the procedure for removing the main...
  19. J

    Upstairs Circuit

    Hi, In your opinon is 20amp more than suitable for an 3 bedroom upstairs circuit, cant think why they really need to be 32amp maybe if you started plugging in 3kw heaters :) thanks
  20. stidge

    cu in shower room

    Hi all, job visited they are extending downstairs wc and fitting a shower(quadrant)the meters gas, elec and old wilex rewireable cu. they want a new cu fitting, shower feed, lights etc. I have told them the cu will have to be moved out of room but meters can remain boxed in! (In cupboard with...

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