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RCD Types for EV Chargers on TT systems

Former Community Member over 3 years ago

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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0 AJJewsbury over 3 years ago

So, is the wording in 722.531.3.101 wrong?
I wouldn't say it's wrong, but it's only concerning itself with the RCD protection required by the EVSE outlet (which would need to be part of the installation if not incorporated into the EVSE) - it simply doesn't comment on the requirements for any further upstream RCDs.
- Andy.
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0 AJJewsbury over 3 years ago

So, is the wording in 722.531.3.101 wrong?
I wouldn't say it's wrong, but it's only concerning itself with the RCD protection required by the EVSE outlet (which would need to be part of the installation if not incorporated into the EVSE) - it simply doesn't comment on the requirements for any further upstream RCDs.
- Andy.
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RCD Types for EV Chargers on TT systems

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