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EV charging glossary

Industry jargon

RDC-DD

Also called: Residual Direct Current Detecting Device A Residual Direct Current Detecting Device, or RDC-DD, detects DC residual current in Mode 3 EV charging equipment so the protective system can respond appropriately. It is used because DC residual current can affect the operation of some upstream RCD types. BS IEC 62955 covers RDC-DDs for Mode 3 charging. An RDC-DD detects the DC residual current but does not itself provide the complete mechanical switching function; that switching is provided by another device. Where suitable DC residual-current protection is provided in the EVSE, BS 7671 allows different RCD arrangements from those required where that protection is absent. The final selection still depends on the current standard and the equipment design.

Related terms

RCD

Mode 3 charging

EVSE
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