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Discussion Starter · #1 · (Edited)
We want to install an EVSE in the detached garage/carport.

We will need to run a new supply to the garage as part of this, and I don’t want to use a 6 week trained OLEV grant exploiting “EV specialist”. At 30m distance on the plan view and at least 50m once routing via loft is taken into account, the new garage supply will likely be the biggest part of the job.

We have been happy with electricians we’ve used before (they did an EICR and remediation for us) but they don’t have much in the way of EVSE installation experience - so not aware of the details of DC protection, load curtailment options, etc. and can’t really advise on models of EVSE.

Are we better off looking for someone (hopefully local - chippenham/trowbridge area) with more EVSE experience or will a “normal electrician“ be fine?
 

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MG5
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Worth looking at EVSE units with built in protection like the Zappi (see my reply on your other thread).
If your sparky has the 18th addition and has read the latest amendments you should be fine.
 

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Any competent electrician should be more than technically able to do something as simple as a charge point install, if they aren't, then that implies they are not current and don't have a copy of the current edition of the wiring regs, and in turn, without those they shouldn't be working. A charge point install is a pretty simple job, there's no special knowledge required, other than understanding how to set up any products specific app, connectivity etc. Only thing to note is that some manufacturers insist that anyone installing their products be approved by them. In general that's no big deal, or shouldn't be, given how simple the task is.
 

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so not aware of the details of DC protection, load curtailment options, etc.
So they are honest enough to admit the limit of their current knowledge, but are they willing to read and digest the regulations or are they too lazy and just growing fat on their current excess work?
 

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The one area of concern would be testing it. After watching some install videos there is a bit of kit that tests it works OK and I would guess they might not think it would be worth buying that test kit? Should that be a concern?
 

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The one area of concern would be testing it. After watching some install videos there is a bit of kit that tests it works OK and I would guess they might not think it would be worth buying that test kit? Should that be a concern?

It's not test kit as such, just a box that had a couple of switched resistors so that it can turn the charge point on and off, plus an outlet to allow things like correct polarity, continuity of CPC and Zs to be checked. I made mine, cost about £90 for the parts, most of that being the Type 2 connector (that was around £60 IIRC). I added some bells and whistles to be able to use the same box to test that a charge point had the correct fault detection capability, but that's not needed for an installation:

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Our install was very much like yours - the feed to our (detached) garage needed updating, which required a 10mm swa running from the consumer unit in the house, under the front garden, into the garage, then into a new consumer unit. We had a local electrician do it that was recommended to us.

He'd never done an EV installation before but was aware of the regs. In the end he did an excellent job, very neat, properly signed off, and we've had absolutely no problems since. Because of all the sundry work involved, it was far cheaper than getting an OLEV installer.

If you can get a charge point with DC and open PEN protection built in then it's a pretty straightforward job for any electrician.
 

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Discussion Starter · #8 · (Edited)
Our install was very much like yours - the feed to our (detached) garage needed updating, which required a 10mm swa running from the consumer unit in the house, under the front garden, into the garage, then into a new consumer unit.

Because of all the sundry work involved, it was far cheaper than getting an OLEV installer.
Yeah. Our electrician has advised 25mm2 SWA to support 60A for charger plus garage while keeping the voltage drop on 50+m run within the 3% limit (for lighting circuits in garage). 10mm2 or 16mm2 would probably be sufficient if it was just for the charger (lower current and 5% drop allowed for non-lighting circuits).
 

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Yeah. Our electrician has advised 25mm2 SWA to support 60A for charger plus garage while keeping the voltage drop on 50+m run within the 3% limit (for lighting circuits in garage). 10mm2 or 16mm2 would probably be sufficient if it was just for the charger (lower current and 5% drop allowed for non-lighting circuits).
Sounds right. Far better to over-specify on jobs like this - you don't want to be doing it again in future!

Ours is rated at 50A but the distance is much shorter than yours - luckily the house consumer unit is on an outside wall facing the garage, so the SWA only had about 10-11m to travel, thus 10mm was adequate.
 
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