Chapter 5: Selection and Erection of Equipment

BS 7671 outlines the requirements for selecting and installing electrical equipment to ensure safety, reliability, and compliance with regulations.

Overview of Chapter 5 – Key Considerations

5.1 Common Rules

• Ensures **compliance with British Standards and harmonized European Standards**.
• Defines **installation methods, materials, and equipment selection**.
• Requires **proper identification of conductors and labeling**.

5.2 Selection and Erection of Wiring Systems

• Specifies **types of wiring systems** suitable for different environments.
• Considers **external influences** such as temperature, humidity, and mechanical stress.
• Ensures **proper electrical connections and fire prevention measures**.

5.3 Protection, Isolation, Switching, Control, and Monitoring

• Defines **requirements for circuit isolation and switching**.
• Ensures **proper control mechanisms for electrical safety**.
• Includes **monitoring systems for fault detection and prevention**.

5.4 Earthing Arrangements and Protective Conductors

• Specifies **earthing requirements for electrical installations**.
• Defines **main protective bonding and supplementary bonding**.
• Ensures **correct sizing and installation of protective conductors**.

5.5 Other Equipment

• Covers **requirements for electrical accessories, generators, transformers, and lighting systems**.
• Includes **installation guidelines for street furniture and outdoor electrical equipment**.

5.6 Safety Services

• Defines **requirements for emergency systems such as fire alarms and backup power supplies**.
• Ensures **safety services remain operational during faults or power failures**.

Why Chapter 5 Matters

• Ensures **electrical installations use appropriate materials and methods**.
• Prevents **hazards caused by improper equipment selection**.
• Guarantees **long-term reliability and safety of electrical systems**.