Is this EVCP install correct? Artisan electrics.

HappyHippyDad · Sep 30, 2021

Firstly, this chap seems very professional and I like his (plethora) of videos. It is just to discuss one aspect of his work in the one video. I'd like to think he would welcome constructive discussion as that can only lead to improvement.

He has installed an earth rod to this rolec charger. My confusion is related to the purpose of this earth rod. Is it purely to obtain sub 200ohms in order for the RCD in the charger to trip correctly, or is it to adhere to regulation 722.411.4.1 (ii) which means obtaining an Ra of around 1ohm. If the latter, then one earth rod will not have achieved this.

Actually, if he has glanded off the SWA in a stuffing gland and not connected the 3rd core (earth) of the SWA to the earth in the charging unit then that would be ok? He would have made the whole charging unit a TT? I'm not sure if he has done this though. If he has used a normal SWA gland, then the nut of the gland will be TNCS, whereas any exposed conductive parts within the charger will be TT.

This thread is just to discuss this, no real questions in mind. I'm finding EVCP's more and more interesting (not the OZEV grant bit though!).

Julie. · Sep 30, 2021

HappyHippyDad said:
Firstly, this chap seems very professional and I like his (plethora) of videos. It is just to discuss one aspect of his work in the one video. I'd like to think he would welcome constructive discussion as that can only lead to improvement.

He has installed an earth rod to this rolec charger. My confusion is related to the purpose of this earth rod. Is it purely to obtain sub 200ohms in order for the RCD in the charger to trip correctly, or is it to adhere to regulation 722.411.4.1 (ii) which means obtaining an Ra of around 1ohm. If the latter, then one earth rod will not have achieved this.

Actually, if he has glanded off the SWA in a stuffing gland and not connected the 3rd core (earth) of the SWA to the earth in the charging unit then that would be ok? He would have made the whole charging unit a TT? I'm not sure if he has done this though. If he has used a normal SWA gland, then the nut of the gland will be TNCS, whereas any exposed conductive parts within the charger will be TT.

This thread is just to discuss this, no real questions in mind. I'm finding EVCP's more and more interesting (not the OZEV grant bit though!).

Haven't looked at it in full, but Rolec chargers do not have a CNE/PEN fault detection device, it is therefore normal to provide these with TT - however you must also ensure there is no TN(C)S exposed within the area. (so no class 1 exterior lights for example) - and yes gland off the SWA - but do not use the TN(C)S earth from the gland - in fact this must be insulated on the outside so contact cannot be made.

snowhead · Sep 30, 2021

HappyHippyDad said:
If he has used a normal SWA gland, then the nut of the gland will be TNCS, whereas any exposed conductive parts within the charger will be TT.

[ElectriciansForums.net] Is this EVCP install correct? Artisan electrics.

HappyHippyDad · Sep 30, 2021

snowhead said:
View attachment 90582

I should have watched the clip more thoroughly! I shall log on to youtube and apologise to him ?

loz2754 · Oct 1, 2021

@ArtElectrics is a member of this forum.
Looking at the video you posted, it would seem there may be a problem here.
If the EVCP has been wired as a TT system, the problem is that outside tap right next to it....

However, if you watch the whole video (which I admit I didn't at first), Jordan says he had to put an insulating section in the pipe.