UPS Charging current

Merry Christmas

m sleem

Senior Member
Location
Cairo
Do we need to size the ups upstream breaker so that it's rated to the UPS FLC + Batteries charging current?
 

qcroanoke

Sometimes I don't know if I'm the boxer or the bag
Location
Roanoke, VA.
Occupation
Engineering
Do we need to size the ups upstream breaker so that it's rated to the UPS FLC + Batteries charging current?
We do exactly what the installation manual says. From overcurrent/short circuit protection to wire size to input and output being in separate raceways.
 

don_resqcapt19

Moderator
Staff member
Location
Illinois
Occupation
retired electrician
If the UPS always supplies power to the load, even with normal power on, then the power supply to the UPS will have to support both the actual load and the battery charging load. That way when normal power is restored, the supply circuit can supply both the actual load and the battery charging load.
 
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