RCD Type Specification Engine
BS 7671 Residual Current Device Selection (Regulation 531.3.3)
1. Load Characteristic Profiler
Symbol Reference Library
TYPE A
Understanding RCD Types (BS 7671 Regulation 531.3.3)
Residual Current Devices are critical for life safety, but modern electronic loads have made selection complex. Standard Type AC RCDs can be 'blinded' by pulsating DC current, rendering them useless in modern homes.
Modern RCD Classifications
- Type A: Baseline for modern homes. Detects AC and pulsating DC.
- Type F: Required for frequency-controlled motors like heat pumps.
- Type B: Mandatory for EV chargers and Solar PV arrays.