Emergency battery pack lighting in site with standby generator

[echo14]

Can anyone tell me if you need emergency battery pack type lighting in a waste water treatment plant if the entire site is backed up on standby generator?

[kenaslan]

Yes you do.

If the gen set takes longer than 10 seconds to come online

[MIEngineer]

There is also a requirement to separate the legally required loads from the optional ones; EM lighting and exit signs vs. HVAC. There's a lot of detail in Article 700.

[jimbo123]

how is the generator listed ? Legally required or emergency generator or backup gen. I am not sure one has 1 minute vs a 10 second requirement. just asking. i don't know.