t01474
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- Reaction score
- 18
Evening everybody.
It’s been a while since I’ve asked for the collective brains advice but this one has really got me stumped.
I’ve been asked to install a twin outlet 22kW EV charger at an office. Unfortunately the office is an old doctors surgery (3 storey ex-house, basement , pitched roof , loft , etc).
The supply is in the basement and the proposed site for the charger is on the driveway, 100m cable length away!
The only options I can see via the cable calcs are to install a 25mm sub main to a db which then via MCB , RCD turns into two 16mm SWA’s for the charger or 2 16mm SWA’s from the intake to the charger (with the db , MCB , RCD’s at the intake position).
I’d love to just put two 230v chargers in but don’t think I can due to further unbalancing an already unbalanced system.
Has anybody got any bright ideas?
There is a supply (single phase) already at the garage (32a) and if it wasn’t for the 400v main system I’d gladly come off of that and use load limiting via CT’s.
I can’t think of another job that I’ve done where having 3 phases has worked out to be less helpful than single phase!
It’s been a while since I’ve asked for the collective brains advice but this one has really got me stumped.
I’ve been asked to install a twin outlet 22kW EV charger at an office. Unfortunately the office is an old doctors surgery (3 storey ex-house, basement , pitched roof , loft , etc).
The supply is in the basement and the proposed site for the charger is on the driveway, 100m cable length away!
The only options I can see via the cable calcs are to install a 25mm sub main to a db which then via MCB , RCD turns into two 16mm SWA’s for the charger or 2 16mm SWA’s from the intake to the charger (with the db , MCB , RCD’s at the intake position).
I’d love to just put two 230v chargers in but don’t think I can due to further unbalancing an already unbalanced system.
Has anybody got any bright ideas?
There is a supply (single phase) already at the garage (32a) and if it wasn’t for the 400v main system I’d gladly come off of that and use load limiting via CT’s.
I can’t think of another job that I’ve done where having 3 phases has worked out to be less helpful than single phase!