18th Edition Briefing – March 2018

18th Edition Wiring RegulationsPublication date for 18th now confirmed as 2nd July 2018

Regulations come in to effect on installations designed after 31st December 2018


18th Edition changes and additions

We now know which sections and regulations are changing in the BS7671:2018 Requirements for Electrical Installations.

Part 1 Scope, object and fundamental principles

133.1.3 will require a statement on the Electrical Installation Certificate.

Part 2 Definitions

As with every update, new and changed definitions are included

Chapter 41 – Protection against electric shock

Significant changes are proposed throughout this chapter.

411.3.1.2 metallic pipes and point of entry

411.3.2.2 maximum disconnection times

411.3.3 limit to 32A and risk assessment relating to RCD protection

411.3.4 new regulation – RCD and luminaires

411.4.3 switiching and isolating device in PEN conductor

411.4.4 and 5 redrafts

411.6 deletions and redrafts

419 automatic disconnection not feasible

Chapter 42 – Protection against thermal effects

Installation of arc fault detection devices to mitigate risk of fire

Chapter 44 – Protection against voltage disturbances and electromagnetic disturbances

Changes to specific sections and critically a requirement for risk assessment to be performed in order to determine if protection against transient overvoltage is required.

Chapter 46 – Devices for isolation and switching

This chapter which was removed after the 16th Edition, reappears. This chapter will  cover the requirements for the functions of isolation, functional switching (control), auxiliary circuits, motor control, switiching off for mechanical maintenance and emergencies, which are currently in Section 537. The requires for the devices relating to these functions will remain in Section 537.

Part 5 – Selection and Erection of Equipment

Chapter 52 – concerning wiring support systems, SELV buried cables and CPR requirements

Chapter 53 – Changes to protection against overvoltage, earthing arrangements, protective conductors and other equipment including ground-recessed luminaires.

Chapter 54 – new regulations relating to earth electrodes and switching devices in a protective conductor

Chapter 55 – new scope and ground recessed luminaires

Part 6 – Inspection and testing

Completely restructured to align with CENELEC standards

Part 7 – Special installations or locations

A large number of small changes in many sections in particular

704 Construction sites,

708 Caravan/Camping parks,

710 Medical locations,

715 Extra low voltage lighting installations,

721 Caravans,

722 Electric Vehicle Charging,

730 Onshore Units – new section to apply to onshore installations supplying inland navigation vessels – whose power requirements are significantly greater than those of vessels covered in 709 Marinas

753 Floor and Ceiling Heating

Appendix 17 – Energy Efficiency

A major new addition to the Wiring Regulations to support the worldwide requirement to reduce the consumption of energy and how electrical installations can contribute to this effort, effectively and safely.

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