Given that most cars could also take 3 phases as well as single phase charging, there really should be no problems. The important thing is that the earthing to all cars that may be simultaneously touched is common, so there is no risk of there being an exposed voltage difference.

~Mike.

Hi Mike

Thank you for the response. Yes each charging point is taken from a common three phase distribution board with common earth. 

The issue of "simultaneously accessible single phase equipment on different phases" comes from industry guidance that was prevalent quite a long time ago ... based on what was in the Wiring Regs at the time.

It's no longer an issue for single-phase equipment supplied from different phases of the same installation (and earthing system) to be simultaneously accessible.

It's now accepted that if you can touch live conductors of two phases of an LV system at once from single-phase equipment then either:

(a) two faults have occurred (and BS 7671 only deals with single-fault conditions); or

(b) there have been two breaches of legislation.

Thanks Graham, appreciate your input. 

Risk is still there but managed and with correct labelling  

Why six single phase 7 Kw chargers, rather than three dual-port three phase 22 Kw chargers?

Why do you think any labelling is required? Which regulation? There is none required.

Hi there, the configuration is 6 x 7.4kW chargers (3 x dual pole SP) and was a client requirement. 

Hello

For me it is good practice, the chargers are remote from main switch-gear. 514 refers. 

Hope that helps

514 refers. 

The current regs only require labelling when there's a nominal voltage to earth in excess of 230V - there's no such voltage on a 3-phase 400/230V system.

The requirement to label when there was >250V between conductors went the way of the dodo decades ago.

   - Andy.

AJJewsbury said:

The requirement to label when there was >250V between conductors went the way of the dodo decades ago.

Surprising the number of folk in the industry that don’t know that. I still see it on specifications, although I suppose designers are quite at liberty to go above and beyond 7671 requirements.