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RCD Types for EV Chargers on TT systems

Former Community Member
Former Community Member

On a TT install, where the supply for EV chargers comes from a feeder pillar. If the EV charger has a 30mA Type B RCD, is there a requirement for an upstream 300mA Type B RCD or can it be a different type? 
Can I specify 300mA RCDs as the main switch (is this type B?), and what would the solution be if I wanted a 250A incomer, would I then need an additional upstream type B RCD for each charger between the distribution board and the charging unit. This is a very expensive component if needed.
Siemens and an article from Voltimum have indicated that the upstream RCD needs to Type B and the code of practice shows a 300mA RCD upstream on a diagram but not which type. 
Looking for some guidance on this and an explanation if possible.

Thanks

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    722.531.3.101 doesn't seem to care whether the EVSE has a Type B RCD or RDC-DD within it, except that you might be able to get away without the Type A RCD upstream if there's a Type B within it.

    So, is the wording in 722.531.3.101 wrong?

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    722.531.3.101 doesn't seem to care whether the EVSE has a Type B RCD or RDC-DD within it, except that you might be able to get away without the Type A RCD upstream if there's a Type B within it.

    So, is the wording in 722.531.3.101 wrong?

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