Paper 2 – Electrical Uses PAPER 2 Electrical Uses UNIT 9 Types of Wiring in Industries Section 2: Industrial Electrical Installations 1. Types of Wiring in Industries o Cleat, Casing-Capping, Metal-Sheathed o Conduit & Armoured Cables o Switchgear for Industrial Power & Lighting Industrial Electrical Installations – Wiring & Switchgear Principle/Working Mechanism Industrial wiring systems…...

Paper 2 – Electrical Uses PAPER 2 Electrical Uses UNIT 8 Protective Devices in Domestic Wiring Protective Devices in Domestic Wiring Principle/Working Mechanism Protective devices safeguard electrical systems by: Overcurrent Protection (Fuses/MCBs) Earth Leakage Protection (RCCBs/ELCBs) Surge Protection (Lightning arresters) Working Principles: Thermal-Magnetic Trip (MCBs) Residual Current Detection (RCCBs) Voltage Diversion (Arresters) Types/Classifications Overcurrent Protection Device Trip Mechanism Current Range Symbol…...

Paper 2 – Electrical Uses PAPER 2 Electrical Uses UNIT 7 Fault Finding & Testing in Electrical Systems Fault Finding & Testing in Electrical Systems Principle/Working Mechanism Fault detection identifies abnormalities in electrical systems by measuring: Resistance (Insulation/continuity) Current Leakage (Earth faults) Circuit Integrity (Short circuits) Key Concepts: Ohm’s Law (V=IR) for fault analysis Kirchhoff’s Laws for current/voltage distribution Safety…...

Paper 2 – Electrical Uses PAPER 2 Electrical Uses UNIT 6 Energy Measurement & Billing Energy Measurement & Billing Principle/Working Mechanism Energy meters measure electrical consumption by tracking: Voltage (V) and Current (I) over Time (t) Basic Formula: Energy (kWh) = Power (kW) × Time (hours) Working Principle Types: Electromechanical Meters: Rotating aluminum disc (Ferraris principle) Electronic Meters: Digital…...

Paper 2 – Electrical Uses PAPER 2 Electrical Uses UNIT 5. Installation & Maintenance of Domestic Appliances Installation & Maintenance of Domestic Appliances Principle/Working Mechanism Domestic appliances convert electrical energy into: Heat (Heat pumps, cookers) Motion (Fans, pumps) Cooling (Refrigerators) Signaling (Bells, alarms) Key Concepts: Power Rating (Watts) Voltage (230V AC) Efficiency (Energy Star ratings) Types/Classifications   Heaters & Cookers Type Power…...

Paper 2 – Electrical Uses PAPER 2 Electrical Uses UNIT 4. Circuit Diagrams for Domestic Wiring Circuit Diagrams for Domestic Wiring Principle/Working Mechanism Domestic wiring distributes power through: Radial Circuits (Single cable from DB to appliance) Ring Circuits (Loop from DB back to DB – common in UK) Star Wiring (Individual cables for each load) Key Concepts: Live…...

Paper 2 – Electrical Uses PAPER 2 Electrical Uses UNIT 3. Estimation of Materials & Costing Estimation of Materials & Costing for Electrical Installations Principle/Working Mechanism Material estimation involves calculating quantities of wires, conduits, switches and other components needed for an electrical installation. Costing determines the total project expense based on: Material costs Labor charges…...

Paper 2 – Electrical Uses PAPER 2 Electrical Uses UNIT 2. Switchgear for Domestic Installations Switchgear for Domestic Installations o Main & Sub-Distribution Boards o Switches, MCBs, ELCBs, and Isolators o Fuses & Cut-Outs Switchgear for Domestic Installations Principle/Working Mechanism Switchgear controls, protects, and isolates electrical circuits in homes. It ensures: Safe power distribution (via distribution…...

Paper 2 – Electrical Uses PAPER 2 Electrical Uses Section 1: Domestic Electrical Installations UNIT 1. Types of Wiring Systems Section 1: Domestic Electrical Installations 1. Types of Wiring Systems o Cleat Wiring o Wooden Casing & Capping Wiring o Metal-Sheathed Wiring o Conduit Wiring (Surface & Concealed) o Armoured Cables o Comparison & Selection…...

Paper 2 – Electrical Uses PAPER 2 Electrical Uses • Electrical Formulas and Conversion Tables Electrical Formulas and Conversion Tables • Sample Calculations for Voltage Drop, Power, and Illumination • Common Electrical Symbols and Diagrams Here’s a structured breakdown of the requested topics with a mix of simple and technical explanations, including symbols, units, and…...