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  1. J

    Is RCD protection required on SWA supply cable to EV?

    Well some aspects of the "grey" area are actually very clear, 722.531.3.101 in simple terms mandates that a compliant RCD is fitted before the connection to the vehicle. It is irrelevant as to TT, TN-S, TN-C-S or PME, so the earthing arrangements have no bearing on the need for a RCD...
  2. J

    Connecting 1930s steel conduit to new CU

    In those examples, just remove the female Bush and fit a standard BSCon locknut, then refit the Bush. Just looks like 3/4 and 5/8 BSCon to me, locknuts are available. (I would either fit extra washers on the 5/8 - or drill a proper size hole and re-locate if at all possible) just knocking out...
  3. J

    High Zs on a Campsite

    Put an mcb (50A) at the supply to the toilet block along with a 100/300mA type s rcd. As "rcd provided for fault protection in accordance with 411.4.204." Each circuit below this can be fitted with an rcbo, or rcd at 30mA for the usual final circuit protection. Coordination will be achieved as...
  4. J

    Is RCD protection required on SWA supply cable to EV?

    Yeah I can't understand why it's necessary to fit one here - and said as much in the comments to the video, quoting the same reg as I stated above. The regs haven't changed that much at all in the respect of the rcd, just different wording for essentially the same thing. I think they may be...
  5. J

    Is RCD protection required on SWA supply cable to EV?

    There is a bit of a grey area. Providing the EVCP has an integral rcd to BS EN 61009 then a mcb should be acceptable upstream with armoured cable. However, some EVCPs have a proprietary rcd, not compliant/proven with/to BS EN 61009, in which case a compliant rcd will need to be fitted. The...
  6. J

    Pump wired in 2.5mm on a shower circuit 10mm on Type B 40 acceptable ?

    There are two reasons for a fuse/mcb they are: 1) fault conditions - which must exist always, and be capable of operating for all points on the circuit within the time determined by the sort of circuit; and be located at the source. (ADS) 2) overload conditions - which is not required if...
  7. J

    HV Schneider Breaker

    Since they are VCBs the breaking capacity should be similar/identical between 50 and 60hz, however the overall switchgear will contain CTs and possibly VTs , these are likely to be specific to a particular frequency.
  8. J

    Eddy current clarification

    Won't add any heating effect, unless it is carrying current.
  9. J

    Eddy current clarification

    You are not mistaken, eddy currents (Foucault currents) will be induced in any conductor within the presence of a changing magnetic field. However the ferrous material tends to enhance the effect. I have to say though, we designed MV and HV switchgear for typical currents of circ 630 -...
  10. J

    UK 32A or 40A breaker for 7kW EV Charger

    Unfortunately not. It's for an EVCP which is basically a fancy socket outlet. The EVCP tells the vehicle that it has a maximum current of 32A. The charger within the vehicle then (if working correctly) will charge at the 32A rate - or a reduced current if the in-vehicle charger has a maximum...
  11. J

    UK 32A or 40A breaker for 7kW EV Charger

    I don't quite trust reports or EIs with installation methods, it's virtually impossible for the same method to be used all the way through the installation of a particular circuit. It's usually a combination of clipped direct over most of it, a bit through duct/conduit and a bit behind...
  12. J

    UK 32A or 40A breaker for 7kW EV Charger

    That Zs should be fine for a 40A mcb, however it still doesn't mean it would be ok to change. A 6mm^2 cable, depending upon the type and installation method may not be capable of carrying 40A. I have 32A on my EVCP, no need to go to 40A.
  13. J

    UK 32A or 40A breaker for 7kW EV Charger

    You cannot just increase the breaker size without confirming that it will operate in the correct time. Each breaker must operate within a set time, which equates to the circuit having a particular resistance or less. Without knowing the characteristics of the circuit you won't know if the...
  14. J

    Correct earthing method for house?

    To the OP, I would ask the sparky to measure the "Ze" using the neutral and a phase. If it comes out low at 0.35ohm or so, then ask the utility for the earth - most are trying to deliver PME when they can, so might be an oversight. If it comes out much higher then this that would be why they...
  15. J

    Correct earthing method for house?

    To the OP I think that was the plan, they probably expected the meter fitter to bring tails out of the meter into the blocks, not expecting an isolator to be fitted.
  16. J

    Correct earthing method for house?

    I assume the electrician fitted the cu etc and terminated in blocks as they didn't know what would be installed by the supplier/meter installer.
  17. J

    UK 3rd Party Testing

    That example isn't, but just because there can be bad situations, doesn't mean that every other case is. Hence I can't understand the outright objections. Sure object in the right circumstances, but also accept it's a valid arrangement when it is.
  18. J

    UK 3rd Party Testing

    I never really understand the outraged and strenuous objections to third party testing, after all the EIC is designed for this very thing. On large projects I would receive the EICs for me to complete as the designer, they would already be installed and signed by one "installer " - usually...
  19. J

    Very high Zs on ring main.

    And your r1 and r2 values ? How do these compare to rn?
  20. J

    Calculate the appropriate size of the protective conductor exam question

    These are often difficult questions, because although your calculation is correct - leading to the answer 1.5mm^2 there are sometimes related regulations. So if the question relates to final circuits etc (I.e. twin & earth or whatever), this would be correct. However, if the question...

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