Professional Development · Trades & Technical Skills · Protection Measures and Safety Systems
Protection Against Electric Shock – Classes and RCD Protection
This topic examines the layered framework that BS 7671:2018+A2:2022 uses to protect persons and livestock against electric shock. It covers basic protection (insulation, barriers, enclosures), fault protection through automatic disconnection of supply and double/reinforced insulation, the three classes of electrical equipment (I, II, III), protective and separated extra-low voltage systems (PELV and SELV), and the role of 30 mA RCDs as additional protection in high-risk locations.
Inhaltsübersicht
- The Framework of Protection Against Electric Shock
- Basic Protection – Insulation, Barriers and Enclosures
- Fault Protection – ADS, Double Insulation and Equipment Classes
- SELV and PELV – Extra-Low Voltage Protection Systems
- RCDs as Additional Protection – 30 mA Requirement

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