UPS for emergency lighting

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don_resqcapt19

don_resqcapt19

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retired electrician
If I want to use a remote UPS to provide power to lights that will be the required emergency lighting, does the UPS have to be listed to UL 924 or can a standard UPS be used?
 
Every inverter for egress lighting I have seen installed has been an emergency inverter.

I doubt our inspectors would approve a run of the mill inverter.
 
I don't even know a UPS that isn't built for UL924 compatibility that would give you 90 minutes of backup power.
 
ron said:
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It would be tough for a traditional UPS to come along with 90 minutes of battery and not run into battery failures.
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I have a few installed for PLCs and DCS equipment that have run time exceeding 90 minutes. They have additional battery cabinets to get the extended run time.
 
don_resqcapt19 said:
I have a few installed for PLCs and DCS equipment that have run time exceeding 90 minutes. They have additional battery cabinets to get the extended run time.
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Are the batteries strung together at 12 or 24V OR 120V or something else. When there are more than ~ 2 containers in series (>24V), the UPS batteries with long runtime sometimes don't charge evenly and fail early. If you've had better luck, that's something to remember.
 
ron said:
Are the batteries strung together at 12 or 24V OR 120V or something else. When there are more than ~ 2 containers in series (>24V), the UPS batteries with long runtime sometimes don't charge evenly and fail early. If you've had better luck, that's something to remember.
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The older ones were 120 volt strings, the most recent ones had 480 volt strings. Not sure about early failure, but they normally replace the batteries on a 3 or 4 year cycle.
 
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