Without emergency lighting, occupants may be at risk of injury or harm, particularly in situations where visibility is limited due to smoke, fire, or other hazards.

A minimum duration of 3 hours should be used for emergency escape lighting if the premises are not evacuated immediately. The 3 hour time frame allows the fire brigade time to work in the event of a fire after all of the building’s occupants have been safely evacuated. How often should my emergency lighting system be tested? Emergency lighting test keys are compatible with various switch brands, including MK, Crabtree, Eaton, and MEM.It supplies the power that keeps the emergency batteries charged. That’s why it must not be affected by any switching of L SW. Self testing EM lights "do as it says on the tin" they carry out all the required tests without help, they only have timer software, so that means they will carry out all required tests over 12 months but you can not determine when as they have no calender software. Self testing EM lights also have multiple coloured LEDs and a "beeper" and problems or potential problems are indicated by the sequence / colour of the LED's and beeper. The colours/flashes vary according to each manufacturer. Overall, emergency lighting is an important safety feature in buildings of all types, and it is a legal requirement in most jurisdictions. The majority of UK buildings will have their emergency lights wired on the same circuit as the lighting. For obvious reasons; when the main lights go out you want the emergency lights on. Hopefully they will be connected to a test key switch, like these Who can test emergency lights

Begin the test: Switch off the main power supply to simulate a power outage or emergency. The emergency lighting should activate automatically and remain on for at least 30 minutes. In summary, while a key switch may be a helpful feature for some emergency lighting systems, it is not typically necessary or required for basic testing of the emergency lighting system.Along with other test key manufacturers we can supply the popular Crabtree Emergency Lighting Test Key. This key is designed for use with Crabtree secret emergency lighting test switches. MK Emergency Lighting Test Key