Which standard governs the design, erection, and verification of electrical installations in the UK?

• A. EN 50172
• B. ISO 9001
• C. BS 7671 (IET Wiring Regulations)
• D. IEC 60364

Answer: (C)

The main concept tested is knowing which standard governs how electrical installations are designed, erected, and verified in the UK. In practice, this is BS 7671, the IET Wiring Regulations. BS 7671 provides the UK-specific safety requirements for all electrical installations, covering design choices, materials, wiring methods, protection against shock, earthing and bonding, and the procedures for verification. It specifies how initial verification is carried out after installation and how periodic verification is maintained over the life of the installation, including the documentation like electrical installation certificates and reports.

While IEC 60364 is the international framework that BS 7671 aligns with, the version applicable in the UK is the national standard BS 7671. Other standards exist—for example, ISO 9001 deals with quality management systems and not electrical installation safety, and EN 50172 addresses emergency lighting—but they do not govern the overall design, erection, and verification of electrical installations in the UK.