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RCCB? They should surely have been replaced by RCDs
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RCCB (Residual Current Circuit Breaker) is an older term that is more or less synonymous with RCD (Residual Current Device) and is still widely used to refer to RCDs. I think you may be referring to the distinction between RCDs and the older ELCBs (Earth Leakage Circuit Breakers), specifically VOELCBs (Voltage-Operated...) that sense the difference in voltage between a rod and the system MET. These provide minimal protection against electric shock and are mostly legacy devices that may be well past their use-by date. They were widely installed to meet disconnection times for fault protection on systems with High Ra (typically TT systems) before the general requirement for additional protection using RCDs.