@kezo Well spotted! I have emailed Octopussy and ask if this is ok. It could be that the DNO has incorrectly wired the dog house fuse boxes around. Surely the sparkys would picked that out during commissioning?? Anyway sent a pic and a question to Octopussy.
It would be unlike the DNO to make a mistake!
Your service provider (Octopussy) would have wired from the service head cut-out fuses, into the EDMI 30b smart meter and the isolation switch and connected the tails from your consumer unit into it. What you have to remember, these guys are primarily single phase metering guys, whho have done a short training causes on 3 phase metering and have probably got confused with more than one brown cable 😂
The DNO’s cut-out fuses are labeled L1 (brown) L2 (black) L3 (grey) however, yours are all brown as domestic.
Incase anyone isn’t following, follow through from the DNO’s cut-out fuses:
L1, is typically used for single phase supply – you can see it going terminal 1 of the meter, it then comes out on teminal 2 and goes to terminal 1 of the isolation switch and then to the live feed of the consumer unit (correct)
Cut-out 2 (L2) then goes to teminal 5 of the meter, it then comes out of terminal 6 and goes to terminal 3 (L3) of the isolation switch – The correct way L2 from the Cut-out fuse, should have gone to terminal 3 of the meter and then out on terminal 4 to terminal 2 (L2) of the isolation switch.
Cut-out 3 (l3) then goes to terminal 3 of the meter, it then comes out of terminal 4 of the meter and goes to terminal 2 (L2) of the isolation switch – The correct way L3 from the cut-out fuse, should have gone to terminal 5 of the meter and then out on terminal 6, to terminal 3 (L3) of the isolation switch.
Therefore Phases L2 & L3 are crossed!
Because you are currently still using single phase, there’s nothing to worry about. However, a three phase supply is balanced. By balanced it means the phase voltages have the same amplitude and seperated by whats known, as a phase angle, which is 120deg. When phases 2 and 3 in this case are crossed, it leads to voltage imbalance.
Whether an imbalance, would cause a fault on a three phase charger, isn’t the point. The workmanship is questionable and needs correcting. It would require a third party electrican to hopefully spot the error and not assume everything is wired correctly on the supply side. Even if he did spot it, he has two choices – either switch phases for the charger, to correct the mistake, making them look equally as dumb or down tools and report it and come back once it has being corrected and potentially passing the cost of a wasted day onto the customer.