Part 4: Code of practice for design, installation, maintenance and use of optical fibre systems.Part 2: Code of practice for electrical low mounted way guidance systems for emergency use.Part 1: Code of practice for the emergency lighting of premises.This Regulation is the Code of practice for the emergency lighting of premises and is used as guidance to the correct application of emergency lighting.īS 5266 is published in many parts or sub-topics. Currently BS 5266-1:2016 is the emergency lighting regulation that you need to abide by.