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  1. 0

    RCD disconnection times!

    Yeah, that's how I thought it was but went about explaining it the very long way. Thanks for your time. ?
  2. 0

    RCD disconnection times!

    That question has made me see my fault. I've got it from the rcd trip times. I was using the x1 figures of 300ms. If an rcd was used for fault protection (for example 100ma at rated current would be 300ms trip time)? So if I'm using 30ma RCDs regardless wether it's for fault or additional it...
  3. 0

    RCD disconnection times!

    That answers my question. Perfect thanks for that westward10! Explains it all perfectly. I was just a bit q confused as it says 300ms for RCDs at rated current or 0.2 in TT systems. Is that because its the lesser of the two figures (0.2 and 300ms?) So a TN system is 0.4s but rated current...
  4. 0

    RCD disconnection times!

    Haha! It was more just a simple example, so say I had a zs of 85 ohms, which is obviously too high for fault protection from a bs 60898.. So I'd use the 61008 of a split load board say to protect for fault current. So if I got 250ms trip time for the 61008 at rated current would that be OK...
  5. 0

    RCD disconnection times!

  6. 0

    RCD disconnection times!

    So if it was 250ms would it pass?
  7. 0

    RCD disconnection times!

    Hi all, just a quick one regarding RCD disconnection times. So for non rcd protected circuits disconnection times of 0.4 / 5 seconds and 0.2 / 1 second for TN + TT final and distribution circuits. RCDs (fire / fault protection) usually 300ms at rcd for rated current. (differs when s type)...
  8. 0

    Commercial garage design

    Yeah I thought that was the case. Havent been down that route yet, it's not until the new year but it's certainly the route I want to go down. If not... Circuits that wouldn't normally have to be rcd protected in a TN system have to be offered fault protection in the way of an rcd, in this...
  9. 0

    Commercial garage design

    Any takers? ??
  10. 0

    TT commercial unit upfront RCD

    In any case the rcd could be changed to a 100ma s type Rcd which would offer diversity to the downstream circuits.
  11. 0

    Commercial garage design

    I'm looking at fitting a commercial garage out. I plan to put a 4 pole 300MA S TYPE rcd as main switch on a 12 way 3 phase board providing I can get the Ra down low enough, should be fine though, otherwise it'll be a 100ma s type. Socket circuits and maybe lighting circuits will go on 30ma DP...
  12. 0

    Loss of PME device

    Just seen, they look a little hefty in size though. The pod point looks to be one unit. Nonetheless if they are working are the a good addition in my eyes..
  13. 0

    Loss of PME device

    I'm just curious as to what everyone thinks of the new device that has been made by pod point for their EV chargers? It basically cuts the supply to the charger in the event of a broken PME. Could we see this device being used at the source of PME installations? I personally think it would be...
  14. 0

    TT Submain and switch fuse

    Yeah that's what I thought. So I think the way I'm going ti do it is the best way, 100ma s type rcd for fault protection and a switch fuse adjacent to it for overcurrent protection. Yeah I'm going to go with the two rods and link them aswell. Cheers!
  15. 0

    TT Submain and switch fuse

    Another question! I'm designing for a TT system, there's going to be one 10 way Rcbo consumer unit for the house, less than 3 metres away from the DNO cutout, I'm going to swap the main switch with a 100ma Stype rcd to provide fault protection ( I'll be fitting a tails clamp inside the CU and...
  16. 0

    Designing with LED driver inrush currents

    I actually found that sheet and have downloaded it for future use, very helpful thank you pc! It still could give people big headaches if they go in just thinking they can retrofit to LEDs if they are not wary of this. I think the manufacturers of in the above page you mention say that their...
  17. 0

    Meter tails in ceiling ?

    Why 25mm swa?
  18. 0

    Designing with LED driver inrush currents

    Hi Bill, thanks for the reply. The current wouldn't be there long, probably talking milliseconds, if that. Would I have to see the manufacturers data on the mcb? To see what current they can take for the time the inrush current is present with tripping?
  19. 0

    Recommendations for a wall chaser and other tools for rewire.

    I'm out in Taiwan until the middle of November! I cna let you know then, sorry. I contacted metabo and they said that theirs won't fit the mfe30, I've bought this one with it being a different manufacturer, hopefully it fits and works. (my thinking was why would metabo do one that directly...
  20. 0

    Designing with LED driver inrush currents

    Hi, I am just trying to get my head around designing circuits with high bays, in particular the inrush current from these lights. So say I've got 10 (for ease) 150watt high bays (6.5Amp load @ 230v) with an inrush current of 40amp fitting (400amp) . The instaneous trip current for a 10 B...

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