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  1. Electreacle

    RCD protection upstream?…

    Evening everyone… I’ve attached pictures for your leisure.. so basically the customer does not have any RCD protection.. 3036 fuseboard is in situ.. they want an outside socket.. I’ve told them that I can’t install one as there’s no RCD.. they’re asking if there’s any alternative ways safely...
  2. HappyHippyDad

    Getting a bit confused with this EVCP install!

    Following on from another thread I have some more pictures and some more information. There are 2 questions in bold. The customer has bought the avant rapid charger 400V/16A (moder number A426117), this is to charge the Avant Electric compact wheel loader, model e6. The charger looks like it...
  3. A

    Garage supply/RCBO Upstream

    Hi Gang, Old member here :hand: no idea where my old account went but hey ho! Anyway, having moved into panel wiring I always like to check that I'm doing the right thing domestically etc, you wouldn't think I've got my 2391 but it's been a while! So..ressuplying my large garage with a new...
  4. P

    Upstream RCD's

    Hi all, I am currently planning on designing an installation for a conservatory to be fitted with lights, floor sockets, and underfloor heating. My plan was to take a 6mm T+E from the Hager consumer unit under the stairs, protected at 32A, which would then run above the ceiling of the room...
  5. C

    Breaker Coordination

    The trip ratings of upstream and downstream circuit breakers should be same as I was told by a senior. Why cant the downstream circuit breaker be rated less than the upstream breakers. I'm not talking about the short circuit ratings, but the Ampere trip rating.
  6. GMES

    Understanding Rcds 2016-08-28

    IN THIS ARTICLE we discuss Residual Current Device (RCD) operation, which can occur due to electrical faults both downstream and upstream of the device. An RCD, when correctly selected and installed, can provide protection against electric shock due to indirect contact. RCDs are also used to...
  7. yellowvanman

    10KA or 6KA breakers?

    I know the difference between the 2 sorts but I'm thinking do I need to fit 10KA breakers in this scenario, when I've got 6KA MCBs in the van! 3 phase DB, Isc 4.9KA (phase to earth), all circuits from this DB are single phase. Will never be 3 phase in future (HMO). Worst case short circuit...
  8. Z

    Type D 40A MCB upstream of BS88 63A Fuse

    Can anyone help with the time current characteristics of which will operate first? Essentially a 40A type D crabtree pole star fed from a BS 88 g 63A fuse. Looking at the time current characteristics I reckon that the BS88 would operate at a fault current of 500A for a 0.4s disconnection whereas...
  9. J

    busbars and upstream overcurrent protection

    Hey all Want to gain some opinions on busbars and upstream protection. situation: 3phase busbar chamber, fed from a switch fuse on a rising busbar system. I'm unable to turn off the switch fuse to see what size fuses are installed as it would kill everything on the busbar chamber, but there's...
  10. P

    DISCRIMINATION BETWEEN RCDs

    Morning Guys I know that if a 100mA RCD is followed by a 30mA RCD, the 100mA needs to be S type. If a 300mA RCD is followed by a 30mA RCD (Farm installation) does the 300mA need to be S Type? Cheers Pete
  11. D

    rcd discrimination

    hi guys im an apprentice and need some more understanding about rcds please may i have an example of rcd discrimination and what ratings i would use for different things and why thanks danny
  12. L

    Can an upstream fault cause an RCBO to trip?

    Fellas Scenario - 1 main three phase board feeding 3 further three phase boards with each of those feeding 15 single phase boards containing only two final circuits each. The fault is on the final circuits, ive tested the final circuits and all clear, can a fault on the distribution circuits...
  13. S

    RCD Upstream BG board HIGH LOOP impedance

    A domestic customer has MK dual RCD board #1 and another BG dual RCD board #2 in loft. On testing, a couple of circuits (32a & 16a radials) on board #2 had high Earth fault loop impedance ( over 3 ohms for a socket radial). I know that the BG board (in the loft conversion) does not really need...
  14. C

    CU change with 80mA RCCBO upstream

    I'm changing an ancient CU (does not even have a main breaker, just crappy fuses) that had an 80mA RCCBO put in upstream over a decade ago and want to know if I have to remove the RCCBO or can just go ahead and install everything downstream. I'm putting in a CU with 2 30mA RCDs, 1 protecting...
  15. T

    Maximum tolerable fault current

    Just completing the testing of a transportable catering unit.(chip van). Within the NICEIC REPORT I must complete, a.MAXIMUM TOLERABLE FAULT CURRENT(is the same as PSCC)? b.MAXIMUM TOLERABLE UPSTREAM ELI.(is this the same as Zs)? If so how do I achieve these values when the Power...
  16. J

    Ze testing using a MFT 1553

    Am I correct in thinking that when doing a Ze test using a 1553, the dial needs to be set on the 'Hi' setting in the green loop section of the dial settings? Cheers
  17. E

    2 RCD's

    Hi guys I was just thinking about what someone put about a question I asked a couple of days ago. I asked about putting an RCD proceted fused spur on a ring main to feed an outside light. they said the RCD fused spur will be fine as long as its not protected by another RCD on the cu. My question...
  18. J

    rcd

    can anyone explain how an upstream supply fault can make an rcd trip?....shakey maybe:confused:

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