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  1. K

    Supplementary bonding clarification needed

    Hi I need help with understand supplementary bonding. I know RCD is additional protection and in the even of the fault at leakage of 30mA, it interrupts the circuit and prevents a person to get electric shop by keeping the voltage below 50v. However I also came across this idea if RCD isnt...
  2. K

    One House and 2 Consumer units needed by LL, need help with circuits

    Thanks Littlespark, this matter has already been resolved as council told LL that he would need two supplies and upon discovering the price for another Fuse, LL decided to stick to one house. I have another question as DNO was called at the property because there was no earthing arrangement so...
  3. K

    One House and 2 Consumer units needed by LL, need help with circuits

    Sorry I might have not made it clear but Cooker is supplied using gas , for heating they have gas central heating and since the Landloard wants two consumer unit, one for downstairs and one for upstairs and they have only 6 lights upstairs with a switch and sockets with open kitchen so the same...
  4. K

    One House and 2 Consumer units needed by LL, need help with circuits

    Hi I have a job where customer has two families one families lives upstairs and one family will live downstairs. As the property is going through refurbishing and rewiring is needed but LL has asked me to install two consumer units so basically divide supply using henly blocks and supply the up...
  5. K

    1 Meter and 2 flats

    James there is a single phase supply so that not an option. I never came across this situation before so was wondering what others do in similar situation.
  6. K

    1 Meter and 2 flats

    You are right timehoward, but heating wont be an issue as there wont be any electrical ovens or shower and I am not sure about the gas as they only asked me for electrical opinion. You raised any interesting point about not having 2nd meter on original cutout which I was not aware of. Thanks...
  7. K

    1 Meter and 2 flats

    Hi everyone, a landlord is converting a house into two flats and wants a separate consumer unit for both flats upstairs and downstairs. He also does not want a private meter but a separate meter so they both get separate Bills. Its not a simple job of henley block and split supplies as...
  8. K

    Does anyone know what RCD fault he is talking about

    Thanks Sorry about late message and I did provide a link above now
  9. K

    Does anyone know what RCD fault he is talking about

  10. K

    Does anyone know what RCD fault he is talking about

    Thanks everyone for your replies really appreciate it and Here is the video at 5:19 he is talking about this specific test
  11. K

    Does anyone know what RCD fault he is talking about

    Hi Basically I have visited a youtube link of another electrician and he is talking about how many electricians find RCD fault very hard to resolve and he mentioned it takes less than 3 minutes using the method he mentioned but not completely hence its really puzzling me so if anyone could...
  12. K

    Question about Zs and PSCC needs some clarification thanks

    on TNC-S , as Terre and Neutral are combine hence PSCC and PEFC isnt the same as they are combined at one point? and on TNS as they are separate so PEFC as earth is smaller in size hence during faulty scenario when Earth and L comes in contact shouldnt it generate less fault current than PSCC...
  13. K

    Question about Zs and PSCC needs some clarification thanks

    Thanks alot for the responses . so We check on Supply side of consumer unit for PSCC L-N to ensure if meter tails L-N accidently comes in contact, there is enough fault current generated to be disconnected by the main fuse? On the load side if L-N comes in contact then Protected devices such...
  14. K

    Question about Zs and PSCC needs some clarification thanks

    Hi everyone Recently I have come across an advert of someone selling Afdds C type and the person mentioned the need to sell because Zs was too high so he was considering changing the circuit breaker back to B type as it allows enough Zs to meet the regulations. As Afdds is also combination of...
  15. K

    Ideas on how to install SELV LED on wireless switch?

    Hi everyone I am going to install LED lightstrips in the garden which would be on the SELV and obviously it needs to be installed using stepping down transformer however the lights needs to be on wireless switch technology which would require another transformer to feed the stepdown...
  16. K

    How does Touch voltage work without RCD protection

    Dave so if on TT assuming we are not using RCBOS but splitboard RCD 30mA and for mainswitch 100mA then neutral is no longer an issue so for selectivity time delayed RCD 100mA is a good choice alongside with 30mA RCD ? Sorry I am just trying to understand why on existing so many TT people are...
  17. K

    How does Touch voltage work without RCD protection

    Thanks Aaron but if 30mA can provide Fault and additional protection then why 100mA RCD is required upstream?
  18. K

    How does Touch voltage work without RCD protection

    This makes sense now as in TT system we have higher earth resistance so we cannot rely on ADS to occur hence we need time delay 100mA RCD for fault protection and then for higher risk areas 30mA RCD for additional protection. In TN as you guys explained ADS provides fault protection by...
  19. K

    How does Touch voltage work without RCD protection

    Thanks alot everyone, you guys have been very helpful I really appreciate. I wish my books could explain the way you guys explained. This makes all sense now RCD does not have impact on the current but effects time exposure and ADS is caused by fault current so it has nothing to do with touch...
  20. K

    How does Touch voltage work without RCD protection

    Thankyou very much for detailed reply and it all makes sense but I have one more question thats bothering me and couldnt find the answer. Lets say RCD operates in 40ms at 5 times to give aditional protection which means accidently someone touches live cable , RCD operates in 40 ms at leakage...

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