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Eh up
A client (also a friend of mine) bought a new electric car, and it came with "free charger install" by Podpoint. As it's not a simple job getting power from the service head/DB (under the stairs, in the middle of the house, with solid floors) to the detached brick garage (approx 50m of cable away) the "free charger installer" people have sucked their teeth and told my client to get an electrician in to do the donkey work, i.e. me. I intend to put a small DB on the end of the SWA in the garage as otherwise they want me to run a data cable back to the house as well, which would be a pain.
With the cable run being about 50m ± 5m, 6mm is pushing it for voltage drop (assuming 32A). I was leaning towards 10mm... particularly if further circuits are added to the new DB.
The specs of what they needed to be in place stated, "minimum 6mm 3 core SWA"
I queried this... I asked: "You state a minimum of 3-core 6mm SWA. Subject to verification by calculation for voltage drop, EFLI (as well as CCC), is there a technical reason why 2-core SWA would not be suitable, using the armour as the CPC? Or, if VD calculations require it, 2-core 10mm?"
They replied, "All power cables have to be 3 core to comply with regulations."
There's nothing extraneous in (or near) the brick garage (overall supply is TN-C-S)... if there was then 10mm 3-core SWA would be the way to go, obviously.
Other than the usual "belt and braces" (i.e. waste of copper) and/or future-proofing in case extraneous parts are introduced to the garage in future and need to be bonded back to the MET in the house, are there any regulations specific to EV chargers that require 3-core SWA? I've had a good look at Section 722, but I don't as a rule do EV charger installs so I don't know if I'm missing something...?
The difference between 50m of 10mm 2-core and 3-core is about £75 at the moment... it's not so much my client's money, it's more the principle (and the extra weight/size of the cable).
Thanks!
A client (also a friend of mine) bought a new electric car, and it came with "free charger install" by Podpoint. As it's not a simple job getting power from the service head/DB (under the stairs, in the middle of the house, with solid floors) to the detached brick garage (approx 50m of cable away) the "free charger installer" people have sucked their teeth and told my client to get an electrician in to do the donkey work, i.e. me. I intend to put a small DB on the end of the SWA in the garage as otherwise they want me to run a data cable back to the house as well, which would be a pain.
With the cable run being about 50m ± 5m, 6mm is pushing it for voltage drop (assuming 32A). I was leaning towards 10mm... particularly if further circuits are added to the new DB.
The specs of what they needed to be in place stated, "minimum 6mm 3 core SWA"
I queried this... I asked: "You state a minimum of 3-core 6mm SWA. Subject to verification by calculation for voltage drop, EFLI (as well as CCC), is there a technical reason why 2-core SWA would not be suitable, using the armour as the CPC? Or, if VD calculations require it, 2-core 10mm?"
They replied, "All power cables have to be 3 core to comply with regulations."
There's nothing extraneous in (or near) the brick garage (overall supply is TN-C-S)... if there was then 10mm 3-core SWA would be the way to go, obviously.
Other than the usual "belt and braces" (i.e. waste of copper) and/or future-proofing in case extraneous parts are introduced to the garage in future and need to be bonded back to the MET in the house, are there any regulations specific to EV chargers that require 3-core SWA? I've had a good look at Section 722, but I don't as a rule do EV charger installs so I don't know if I'm missing something...?
The difference between 50m of 10mm 2-core and 3-core is about £75 at the moment... it's not so much my client's money, it's more the principle (and the extra weight/size of the cable).
Thanks!