Diagrams – Bs En Symbols – Diagrams – Circuit Convention – Constructing And Interpreting Circuit Diagrams – Heating And Ventilation System – Relay Logic – Programmable Logic Controllers – Drawing Exercises – Wiring Systems – Radial Systems – Ring Circuits – Distribution Systems – Emergency Lighting Systems – Security And Fire Alarm Systems – Call Systems – Motor Starter Circuits – Central Heating Systems – Extra Low-Voltage Lighting – Domestic Telephone Systems – Testing And Test Instruments – Measurement Of Electrical Quantities – Selection Of Test Instruments – Approved Test Lamps And Voltage Indicators – Accidental Rcd Operation – Calibration, Zeroing And Care Of Instruments – Continuity Of Protective Conductors – Continuity Of Ring Final Circuit Conductors – Insulation Resistance – Polarity – Earth Fault Loop Impedance – Earth Electrode Resistance – Vi Contents – Functional Testing – Prospective Fault Current – Fault Finding – Signs And Symptoms – Ring And Radial Socket Outlet Circuits – Radial Circuits Feeding Fixed Equipment – Cable Fault Location – Emergency Lighting .
