How big does a 3 phase in-balance need to be to mask an open pen fault

Hi All

Thanks for the answers, I would never have noticed the two words changed between amendment 1 and amendment 2.
I know Ai can't be trusted, but it normally gives a good indication on where to look in the big book.

I will just be using the single phase open pen detection built in to the EVCP, it's more or less standard on the products I trust to be user-friendly, reliable and have reasonable customer service. I may TT the house DB or more likely the individual EVCP if there aren't any extraneous parts around. the incoming supply is 50 or 60 meters away and overhead, so not a concern.

Looks like you agree with me on having a 3 phase supply to the property not making much difference. 
I am going to avoid the 3 phase open pen detectors because
   Getting the third phase to the distribution point opens up more challenges
   It would have to be something like a matt e box, personally I don't like the way they just make a hard cut to the supply if there's a problem. Causes spikes, generally electrical stress, doesn't inform an non electrician what's going on. EVCP' software doesn't like going through power cycles.
   Most of the time when these things trigger it's because the DNO are making a poor job of managing the supply voltage, the main benefit of OPEN devices seems to be keeping the DNO honest with managing supply voltage. With luck only one of two phases would be out by enough to cause the EVCP to shut down and the customer will still have one EVCP working while things are sorted out.

There is only one single phase EVCP that allows open pen voltage measurement relative to real earth that I am aware off. Personally I don't like the user interface on the product and I have had 8 of the 10 units I install fail with burnt out connections. I know they have redesigned things, but still not sure I would want to take the risk again.

Hi All

Thanks for the answers, I would never have noticed the two words changed between amendment 1 and amendment 2.
I know Ai can't be trusted, but it normally gives a good indication on where to look in the big book.

I will just be using the single phase open pen detection built in to the EVCP, it's more or less standard on the products I trust to be user-friendly, reliable and have reasonable customer service. I may TT the house DB or more likely the individual EVCP if there aren't any extraneous parts around. the incoming supply is 50 or 60 meters away and overhead, so not a concern.

Looks like you agree with me on having a 3 phase supply to the property not making much difference. 
I am going to avoid the 3 phase open pen detectors because
   Getting the third phase to the distribution point opens up more challenges
   It would have to be something like a matt e box, personally I don't like the way they just make a hard cut to the supply if there's a problem. Causes spikes, generally electrical stress, doesn't inform an non electrician what's going on. EVCP' software doesn't like going through power cycles.
   Most of the time when these things trigger it's because the DNO are making a poor job of managing the supply voltage, the main benefit of OPEN devices seems to be keeping the DNO honest with managing supply voltage. With luck only one of two phases would be out by enough to cause the EVCP to shut down and the customer will still have one EVCP working while things are sorted out.

There is only one single phase EVCP that allows open pen voltage measurement relative to real earth that I am aware off. Personally I don't like the user interface on the product and I have had 8 of the 10 units I install fail with burnt out connections. I know they have redesigned things, but still not sure I would want to take the risk again.