Duration is referenced in BS 5266-1 (‘Code of practice for the emergency lighting of premises’). The minimum duration of an emergency escape lighting system is one hour. However, there are many factors which will determine the duration required. They include the evacuation time, whether the premises are immediately evacuated, size and complexity.
BS 5266-1 also requires written declarations of compliance to be available on site for inspection. A completion certificate should be supplied by the installer, as well as system logbooks, commissioning and testing forms and instructions.