2396 - Electrical Design - EV circuit with full cable calculation run through - E5 Design Series

Richard and Craig run through the final questions on the EVSE design scenario from the live webinar last week!
Thanks to all for the kind feedback and questions coming back in!
We covered correction factors on 90 and 70 degree SWA cables, Max Zs values on a 30mA RCD, Max Ib value for a ring final circuit and loads loads more!
I thoroughly enjoyed myself through this entire series so far, have learned bucket loads and built some skills around screen sharing lol.
Massibe thanks to Richard and David from Electrical Safety First for joining in and Craig Buist of Burgess Electrical Services. Absolute superstars!
We will be back with more design examples and other podcasts soon!
Next up The Water Sparky!

[@rickcostelloe8770]

Great discussion again - agree discretion of the designer. I would say regarding 2396 as long as the candidates explain and justify their decisions the examiner will see the thought process and assign marks accordingly.

[@craigbuist4636]

Thanks for your comments on the video. Lots of possibilities within your comments.
Just out of curiosity do you have specific manufacturers instructions of kit set to 90? I have only seen manufacturers confirming to 70 in their manufacturers instructions so would be keen to see some of these examples for future planning.

[@darrencrannis]

AFFDs & EVCE:
An EV charger (or EV Charging Equipment) is a piece of apparatus which can serve one or more outlets (i.e., the supply to an EVSE won’t necessarily be a “final circuit” as there could be 1 or more “outlets”).
An “outlet” could be either presented as tethered or socketed, it is not classed as a “socket-outlet” for this intent and purpose.
You can see where this is heading…
AFDDs not required (not under the 4 specified conditions). However, a designer can choose an AFDD following the regulation “recommendation” if they do choose.

[@A121podcast]

The interpretation of intent in a nutshell isn't it lol.
A simple sentence in the regs saying EVSE are excluded from the AFDD socket requirements would be a lot clearer. Especially if highlighted in pink!
I've had this on some of the podpoints and funny looking large white chargers I've forgotten the name of 🤣. Twin outlets. Is it the same as a twin socket??? What is an outlet/socket lol. The plot thickens 🤣🤣🤣.
I think we went into this on the original webinar/episode prior and essential said the same as you.
I don't think it's applicable but doesn't hurt. If anything it's a solid idea.
See you in Manchester later this month hopefully.

[@sergiofernandez3725]

Really enjoyed the show. Interesting debate about the 70 / 90 degrees celcius. I think it is important to explain the install. Maybe use the 70 degrees C calculation for domestic even if you use the 90 degree cable. However in comercial / industrial they do have kit that is 90 degree celcius rated.
RCBOs apperently come in single pole, double pole and Single Pole with switched neutral.
Single Pole with switched neutral is not the same as double pole.
William Winter at Verso explains it well on a CZcams video
A few questions or considerations to maybe add to the doc
When you say it's a fixed load, it is now but consider if the unit is replaced due to failure, the manufacturer may send out a new model with a slightly higher load, Eg Zappy V1 vs V2 vs V2.1
What about future proofing the install as we do in a CU. Eg fit a 12 way board with RCBO+SPD and leave 4 spare ways. So use the 10mm CSA
Could we get a price for the EV ultra in 2.5mm 4mm, 6mm, 10mm so the price comparison could be made and offered to the customer?
Keep up the great work guys. I am looking forward to the next episode

[@A121podcast]

Hey mate. Lots of great input there.
The switched neutral rcbos satisfy the regs in terms of opening live conductors. But you are right subtle differences. Will is a ledge, I know the videos in question 🤭.
If the installation is ever adapted with new equipment that is up to the designer and installer to account for. We can't base our decisions on a crystal ball otherwise everything will be wired direct in 10mm lol.
Absolutely with future proofing. That forms part of the design equation. Especially at a domestic level when cable routes are not easily accessible down the line.
The application of design is very important 👌
Having said the above it very much look like we are heading to more DC charging of EVSE in the future with the possibility of cars running house loads! The trial versions of these require large CSA cabling. Personally I think the 7kW charge points are a 5 year sticking plaster while that tech catches up. Thats my crystal ball 🤣.
Thanks for watching and the awesome feedback.