A small panel with Incoming as MCCB and outgoing breakers are with RCBO. I ask the contractor that Incoming MCCB to have RCD with adjustable settings (30mA to 500mA) with some time delay to coordinate with the outgoing 30mA RCDs. The contractor says it is not required to have the RCD with adjustable settings for the Main Incoming MCCB and he asks for relevant IEC code? Is there any IEC code for this?
RCD at the Incoming Breaker
