Emergency system

[DARUSA]

When you have an emergency lights feeding from the emergency generator via transfer switch (regular power & emergency power).Do I have to still install a battery backup fixtures?(emergency ballast)

 

[iwire]

If the transfer switch supplies mixed loads (loads that are outside the scope of Article 700) than you would still need battery units.

 

[A-1Sparky]

It's a good practice to install battery back-up units anyway, as generators and transfer switches don't always work as they're supposed to.