Emergency lighting powered locally

Electrical failures are by far the most common. The most important safety measure is the installation of emergency lights, w hich will go on as soon as the power fails. Their batteries will automatically be recharged after the pow er comes back. They should be installed even in laboratories where w ork is normally performed only during the day. Such units are fairly expensive, but smaller ones made for home use are now available in hard-W are stores. A check should be made with local authorities as to whether these are permissible for industrial use. 

The main functions of storage batteries in the 250 Wh-5 MWh range are to provide standby power for emergency lighting, telephone services, hospital equipment, etc., or for local storage in remote relay stations, radio beacons,... 

---