Second Consumer Unit

[NeilMick]

Looking to get an EV charger installed and want to check my plan of how this is connected makes sense. 

I won't be attempting to do this work myself but would like to plan it so I get the desired outcome. 

My house has PME. 

I want to have a second CU (ip rated) within an ip rated plastic enclosure on the outside of the house. 

To supply that I would look to split the meter tails after the isolator using henley blocks. The new submain for the EV charger would look like this. 

SP Henleys>25mm tails>80a Switch Fuse>16mm 2 core SWA>2nd CU 100a Main Switch>40a RCBO

Regarding the earth I assume it would be okay to also split this using a henley block to take to through the switch fuse and then use the SWA to take the earth out to the second CU? 

If so as the current earth goes straight from the supply to the existing consumer unit I would need the DNO to split this before the electricians come to do the work? 

 

[Murdoch]

I can ONLY advise you to locate a local EV specialist ................ this area of the regs is immensely complicated and very few people understand it properly. This is further complicated by the variety of types of chargers for sale in the UK

AND this is notifiable work too - so make sure the installer is registered with a CPS

 

[SPECIAL LOCATION]

Looking to get an EV charger installed and want to check my plan of how this is connected makes sense. 

I won't be attempting to do this work myself but would like to plan it so I get the desired outcome. 

If you just want to read for your own interest maybe get a copy of this..

https://www.amazon.co.uk/Requirements-Electrical-Installations-Regulations-Eighteenth/dp/1785611704/ref=sr_1_1

and this..

https://www.amazon.co.uk/Practice-Electric-Equipment-Installation-Standards/dp/1839531800/ref=sr_1_1

Then the next sensible thing to do is ask for some local electricians to discuss your requirements do a site assessment to provide some costs for you.

Some electrical jobs are DIY do-able..

EV chargers is not one of them..

:coffee

 

[NeilMick]

As ive stated i'm not looking to do the install DIY, I will be consulting an EV installer for the install of that as well as a part P electrician on getting the second consumer unit installed (may be it turns out to be the same installer for both) 

However I have already had a couple round to look, who don't seem to want to give me a solution which meets my requirements and simply want to get in and out as quick as possible and bag the Olev grant. 

Therefore just looking at the feasibility of what I have said so I can put it in front of them to give me a price, I'm happy to pay what it would cost for the additional works over a straight install to the existing CU. 

Perhaps those I've spoken to are used to customers looking to do it the cheapest possible way..

 

[NozSpark]

The easiest way to supply an EVSE on a TNCS supply is to use a MCB protected SWA circuit to an EVSE with O-PEN protection built in... there are plenty of them.... 

however this is definitely not a DIY thing as you will more than likely have to get permission to install it from your DNO and then there's specialist testing and additional certification required.... depending on your projected maximum demand you may also need to have an EVSE with load curtailment fitted

 

[NeilMick]

It'll be a Zappi which I believe means I won't need a separate PEN fault detection device. 

 

[NozSpark]

As ive stated i'm not looking to do the install DIY, I will be consulting an EV installer for the install of that as well as a part P electrician on getting the second consumer unit installed (may be it turns out to be the same installer for both) 

Use the same person otherwise you may be getting something that isn't required or suitable

However I have already had a couple round to look, who don't seem to want to give me a solution which meets my requirements and simply want to get in and out as quick as possible and bag the Olev grant. 

They have to pass the OLEV grant on to you,,, and then they have a load of paperwork to get it and then  probably won't receive the money for at least 2 months... The OLEV grant is a right PITA for installers

Therefore just looking at the feasibility of what I have said so I can put it in front of them to give me a price, I'm happy to pay what it would cost for end additional works over a straight install to the existing CU unit. 

Perhaps those I've spoken to are used to customers looking to do it the cheapest possible way..

Trust the installers, they know what's required