Is An External Type-A 30mA RCD Still Needed, When There Is Built-In Type-A 30mA And DC 6 MA Protection At An EV Charger?

Some EVSE manufacturers claim that an external type-A 30 mA RCD is not necessary with built-in type-A 30 mA and DC 6 mA residual current protection at their EV chargers. We don't suggest doing it in this way and explaining why.

Some EV charger manufacturers declare built-in type-A 30 mA and DC 6 mA residual current protection for their products. It is nice to have charger built-in type-A 30mA protection as backup protective measures of external type-A 30mA RCDs, but the external type-A 30mA RCDs shall not be removed.

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Shanghai, China

Shanghai Bituo Electric Co., Ltd.

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