Emergency lighting

[cppoly]

For emergency lighting circuits fed from an an emergency panel and controlled through occupancy sensor, do these circuits require an a bypass relay?

For instance, if an entire floor of a commercial building uses occupancy sensors, there are going to be emergency lighting fixtures that will be turned off by occupancy sensors (unless the lights are specified as night lights). When the power is switched from normal power to generator power, all the occupancy sensors will be reset on the floor and, if they don't sense occupancy in their spaces, the lights specified as emergency lights won't turn on. Unless there was a bypass relay. Which will turn on ALL emergency lights regardless of occupancy.

 

[plumb bob]

You can use a BLTC, they will illuminate EM fixtures even if a switch is in an off position or if an occupancy sensor isn't calling for light.

http://www.924inc.com/faqs/index.html

 

[cppoly]

I found in the life safety code handbook (2000 section A.7.8.1.3 in explanations) that it's not required to keep emergency lights on in spaces that are not occupied.

Is this true??

 

[fmtjfw]

Battery backed up emergency lighting

Battery backed up emergency lighting

If the power is out, how is the occupancy sensor going to work?

 

[copper chopper]

because the sensor should be powered by the same back-up power as the source (120 volt- or 277 volt) and on that same lighting circuit. I know your thinking no lying, however i have seen some shady work out there were someone powered a watt stopper power pack off the recepticale instead of the lights and used the dry relay contacts on the light.

 

[cppoly]

If the power is out, how is the occupancy sensor going to work?

The occupancy sensor will be fed from an emergency lighting panel which is fed from a backup generator. If the power goes out the sensor will temporary lose power for 10 seconds until the generator comes on.