FOR EMERGENCY BALLASTS!!!
FOR EMERGENCY BALLASTS!!!
IMHO... Emergency Ballasts are required to be able to illuminate fixtures for 1.5 hours... in a de-energized state. So When the power is disconnected the ballast still has enough stored energy to zap and kill you... Be careful..
The emergency ballast with battery backup are often red in color. They commonly appear with a standard ballast and you end up with a lot more wires than in a standard fixture. There will be two wires coming out of the emergency ballast that are connected together, usually with some kind of plastic covered connectors. If you disconnect then, you will defeat the battery backup. DO NOT REMOVE ANY OTHER WIRING (other than commercial power) before disconnecting these. Also note that there may be both switched and unswitched commercial power in the fixture.
If you don't understand the wiring, examine the diagram printed on the emergency ballast carefully.
[I HATE these emergency ballasts, I'm always afraid an unqualified electrician or "handyman" (70E term) is going to get shocked and maybe fall off a ladder working on them.
We had such a guy who often called up ballast manufacturers 'cause he couldn't understand T5 ballasts.]