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Listen to native speakers pronounce “rcd” in real conversational contexts with synchronized timestamps and subtitles.
Initialism of residual-current device.
“One issue surrounds residual current devices (RCDs), the safety devices found in fuse boxes that sense when current is leaking to ground – a sign of electrocution or a short circuit – and almost instantaneously cut power. Most RCDs used in the UK aren’t suitable for current flowing in both directions and so could malfunction. In the US, the set-up is different but there are similar problems. One reason why Germany has managed to move so quickly [on plug-in solar panels] is that by coincidence it standardised bi-directional RCDs in the 1980s.”