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EV charger on split load

vantech

Hi,

I am planning an EV charger install, and intended on using an RCBO directly off the main switch. The issue is that the board is MK, and I am unable to find a C40 with a type A rating for the RCD. I can only find a B40 with a type A, which is no good.

Installing a new board is not an option. I am however able to find a double pole 100A type A RCCB. 
 

Albeit not ideal, is there anything “wrong” on face value with installing the EV onto an RCCB with other circuits (like ring mains). I fully appreciate it isn't ideal for the isolation of circuits should a fault appear, but to me this does provide suitable overload and RCD protection.

Any thoughts otherwise? 

Thanks. 

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    vantech: 
     

    I am planning an EV charger install, and intended on using an RCBO directly off the main switch. The issue is that the board is MK, and I am unable to find a C40 with a type A rating for the RCD. I can only find a B40 with a type A, which is no good.

    How about testing it with the B40?  At the worst, it might trip on inrush .. very likely it won't have any trouble.  If you don't see it trip on a few ons and offs of charging, just keep it.  The only difference with the B curve is that it's a bit more enthusiastic to trip, i.e. it gives tighter protection.  [The advice is purely technical, on what would be a nice solution for safety, function and cost. I appreciate you might be forced for some reason to obey the letter of the manufacturer's instructions, in which case you should ignore this … though I confess I'd be interested to know if it does nuisance-trip a B40…]

     

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  • 0

    vantech: 
     

    I am planning an EV charger install, and intended on using an RCBO directly off the main switch. The issue is that the board is MK, and I am unable to find a C40 with a type A rating for the RCD. I can only find a B40 with a type A, which is no good.

    How about testing it with the B40?  At the worst, it might trip on inrush .. very likely it won't have any trouble.  If you don't see it trip on a few ons and offs of charging, just keep it.  The only difference with the B curve is that it's a bit more enthusiastic to trip, i.e. it gives tighter protection.  [The advice is purely technical, on what would be a nice solution for safety, function and cost. I appreciate you might be forced for some reason to obey the letter of the manufacturer's instructions, in which case you should ignore this … though I confess I'd be interested to know if it does nuisance-trip a B40…]

     

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