4 off, 2 core swa terminated in Wiska boxes suppling LED pir lights, earth continuity - no!
"4 off"? ...where are the other two?4 off, 2 core swa .....
.... just for the benefit of readers, whilst that describes the bottom line of what an ELCB-v (probably more commonly known as "VOELCB") achieved, it's not a very correct description of 'how it worked', since it was a very simple device, not capable of "measuring" anything.... one of these ..... protected the installation, known as an ELCB-v now no longer used, we hope, but they measured the voltage on the premises earth and if this exceeded 50 volts to true earth it disconnected the supply. ...
I'm not sure that "stopped the device working" is quite the right way of looking at it. As I understand, bonding an extraneous-c-p to the 'earth' within the installation (on the installation side of the ELCB-v) might have prevented the device tripping in response to a fault (since some of the fault current would go though the extraneous-c-p, which might not leave enough flowing through the coil of the ELCB-v for it to trip), but the device always would still trip if the potential difference between installation's 'earth' and true earth tried to rise above about 50V.... I fitted earth bonding, which effectively stopped the device working....
Hopefully the source SWA armour is earthed. If not then that is the first thing to fix.View attachment 276118
4 off, 2 core swa terminated in Wiska boxes suppling LED pir lights, earth continuity - no!
3 more whiska boxes, 4 in total, all the same."4 off"? ...where are the other two?
Kind Regards, John
Ah, right - so you meant "4 off, 2 x 2 core swa terminated in Wiska boxes"?3 more whiska boxes, 4 in total, all the same.
Again for the benefit of other readers, "shorted out the protective device" is a bit misleading. Even with the bonding connected, the device would still have done what it was meant to do (disconnect the supply if the potential of the CPCs within the caravan relative to true earth rose to 50V) - as I see it, the only effect of the bonding would be that, if enough of the fault current flowed through the bonding/extraneous-c-p that that PD fell to <50V then the device would not operate (but would not need to operate to achieve what it was designed to achieve).... As to the ELCB-v which it seems unlikely you have, I found them fitted to static caravans, and it connected the incoming earth to the chassis of the caravan, I was sent to bond the caravan chassis, which I did, with no access to caravan, so was unaware the devices were being used, so I had effectively shorted out the protective device.
Sorry, I think you'll have to clarify what you are talking about.If the bonding inside the building is connected to bonding outside the building then how would you ever get 50 volt between them, best you could get is milivolt.
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