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Discuss EV Charger Installation - Cabling Query? in the Electric Vehicles Advice Forum area at ElectriciansForums.net

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Hi,

We had a EV charger installed recently over the past day ie 32amp 7.2kw. In the fuse cupboard I’ve attached before and after photos.
I have a 100amp fuse for the house.

For the new EV board setup, should the 2 grey cables entering the EV board (10mm) be the same 25mm thickness as the other cables?

Would this cause any issues for me? Or is this against certain electrical standards?
Someone mentioned to me if I was to change the meter or DNO were to action any new improvements, that I’d have to get these 10mm cables changed before any work would be carried out in the future?

I have yet to settle on the work, so if there’s non standard work complete here due to this, I would be in a position to highlight and query the relevant electrical company. I would appreciate any advise?

Please excuse, as my knowledge in electrical stuff is non existent. It maybe that all is looks fine, and I’ve been given wrong advise.

Regards,
HY

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  • Thread Starter Thread Starter
  • #3
The tails are ok.
Have you got an earth electrode outside connected to the charging point?
No I don’t believe there’s any earth electrode outside as the charge point is hosted internal inside our garage, where the garage is part of the house. I assume earth electrode is not applicable as my unit is installed internally?

I assume when you refer to the tails being ok, are referring to those 10mm cables going into the new EV board?

If all looks fine, and above board. I do wonder about the previous advise given in regards to having all cables set at 25mm to avoid future problems in meter changes or any dno type work?

Thanks,
HY

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bill01803

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Arms
There is no requirement for 25mm tails.
If the charging point could be used to charge a vehicle outside regulation 722.411.4.1 states that PME earthing facility must not be used, ie you must have an electrode
 
In this instance it would look like the garage door is very close to the charge point, so you would be able to plug in and move the car outside.
 
There is no requirement for 25mm tails.
If the charging point could be used to charge a vehicle outside regulation 722.411.4.1 states that PME earthing facility must not be used, ie you must have an electrode
You can use PME and the easiest way to do this is to use a charging unit that is made for use with PME.

The 2 other ways are either near enough impossible to satisfy or get very expensive.
 
  • Thread Starter Thread Starter
  • #7
There is no requirement for 25mm tails.
If the charging point could be used to charge a vehicle outside regulation 722.411.4.1 states that PME earthing facility must not be used, ie you must have an electrode
Thanks for your feedback.

Is there any truth in regards to if DNO were to action future works (upgrades) or change of meter (ie smart meter upgrade) that these 10mm tails would cause any probs? Ie DNO or provider refuse to carry out works due to these tails as a result of the recent EV charger install?

Thanks
 

JK-Electrical

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Arms
Esteemed
Judging from the photos you have posted, I can't see anything wrong with this install. Tails are fine, correct type of RCD.

Did the electrician give you an Electrical Installation Certificate in respect of the work? If so, what type of earthing system has the electrician listed on the certificate in respect of the charger? TN-C-S or TT? Could you post a close-up photo of the charger?

Was the install carried-out through the OLEV Homecharge Scheme?
 
Last edited:

JK-Electrical

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Arms
Esteemed
Is there any truth in regards to if DNO were to action future works (upgrades) or change of meter (ie smart meter upgrade) that these 10mm tails would cause any probs?
None whatsoever.

Ie DNO or provider refuse to carry out works due to these tails as a result of the recent EV charger install?
The DNO should already know about this install as electrical contractors are obliged to inform the DNO whenever EV chargers have been added to an existing installation. Sometimes notification needs to be given in advance of the install.
 

Wilko

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Arms
Esteemed
Hi - 10mm is more than sufficient for the load, but I would not have used it. I would use 16mm minimum into a 100A fuse to ensure disconnection without heat damage in a fault, just saying.
 

davesparks

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Mentor
Arms
Esteemed
Hi - 10mm is more than sufficient for the load, but I would not have used it. I would use 16mm minimum into a 100A fuse to ensure disconnection without heat damage in a fault, just saying.
Are you sure 10mm won't be adequately protected under fault conditions?
 

Wilko

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Arms
Esteemed
Are you sure 10mm won't be adequately protected under fault conditions?
Oops, foot in mouth time, I’ll have to check :) -

100A fuse needs 580A to clear in 5 sec and plugging that into adiabatic (from Reg 543.1.3) I get minimum size as 11mm. This would be unlikely to occur as it’d need Cmin and Ze max etc.

More likely could be 850A and 1 sec and that’s about 8mm, so all good.
 

Zdb

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I personally would have used 16mm L,N &E but as long as it's been calculated and it complies then it's all good.
 
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