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OnLine Power
(6002-1646) REV.X8 9
1-5 The Fire Alarm Back-up UPS1481 SIZING
Each model of the Fire Alarm Back-up UPS1481 is designed to supply a maximum load which is
given by its kVA (1000’s of volt-amperes) and KW rating. It is very important that the load is
within the rating of the FIRE ALARM BACK-UP ups1481 to ensure that the connected loads will
be properly supported.
Volt - amperes (VA) are the number of current in amps a device draws multiplied by the nominal
voltage supplied to the device. The total kVA of all the loads to be connected to the Fire Alarm
Back-up UPS1481 is simply the sum of the kVA requirements of each device.
Each electrical device to be powered by the Fire Alarm Back-up UPS1481 should have a
specification sheet attached to it which specifies the amount of power it requires. In addition,
this information should also be listed in the manual supplied with each piece of equipment. The
device’s nameplate should list the electrical requirements of the device in some or all of the
following units: nominal voltage, current, VA or kVA, and watts or KW. If VA or kVA is not given,
then multiply the nominal input voltage by the current shown on the nameplate. Add up the kVA
requirements of each device to be powered by the Fire Alarm Back-up UPS1481.
3. WITH EXTRA AUX. OUTPUT CIRCUIT BREAKERS FOR
VARIOUS OUTPUT VOLTAGES.
1
3
4
7
6
5
2
OUTPUT
CB
GND
TB2
a). ALL AUX OUTPUT CIRCUIT BREAKERS ARE CONNECTED AT
UPS SIDE (HOT SIDE) AND CUSTOMER LOAD SHALL BE
CONNECTED TO THE INDIVIDUAL AUX CBX NEUTRAL WIRES TO
NEUTRAL TB AND GROUND WIRES TO GROUND TB
b). OUTPUT RECEPTACLES ARE CONNECTED TO TB2-OUTPUT
TB AT UPS SIDE (HOT SIDE) AND CUSTOMER LOAD SHALL BE
CONNECTED TO THE INDIVIDUAL AUX. RECEPTACLES.
OPTION: REFER TO SECTION 4-2
240V/120V OUTPUT
H1-N-120V
H2-N-120V
N
H1
H2
GND
N
E
U
T
R
A
L
ALL AUX OUTPUT CB
[1P,20AMP RATED CB'S AS A STANDARD
THE CURRENT AVAILABLE FROM THIS AUX
CB IS LIMITED TO THE TOTAL KW OF EACH
UNIT].