karn
Senior Member
- Location
- United States
- Occupation
- Electrician
My battery backup egress lights have photocells, they will not come on if the building looses power during daylight, is this a problem by any code?
Makes sense.An electric eye would prevent the lamps energizing automatically I'm guessing that they figure that is just one more thing that could go wrong and emergency lights are so rarely used it would not be a real energy saver compared to the risk.
Did you put backup power to the machine room? Might need three hours to finish watching the show and still have enough power for egress lighting afterwardsMakes sense.
Most the emergency exit lighting systems we put in were in cinemas. There would be very little or no ambient light. Slightly off topic, but the UPS systems had to have a 3-hour autonomy. Three hours to evacuate a cinema???
But that was the cinematographic code that they applied. Good for us I suppose - it meant fairly large systems.
The backup powered only the emergency egress lights.Did you put backup power to the machine room? Might need three hours to finish watching the show and still have enough power for egress
lighting afterwards