Appendix A: Power Supply Calculations
The AC Branch Circuit
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AFP-100/AFP-100E Instruction PN 51010:C1 02/06/2002
Appendix A: Power Supply Calculations
The AC Branch Circuit
The control panel requires connection to a separate dedicated 120 VAC or 240 VAC branch circuit,
which must be labeled “Fire Alarm.” The branch circuit must connect to the line side of the main power
feed of the protected premises. No other equipment may be powered from the fire alarm branch circuit.
The branch circuit wire must run continuously, without any disconnect devices, from the power source
to the fire alarm control panel. Overcurrent protection for this circuit must comply with Article 760 of
the National Electrical Code as well as local codes. Use #14 AWG (2.00 mm
2
) wire with 600 volt
insulation for this branch circuit.
Use the table below to determine the total amount of current, in AC amps, that must be supplied to the
fire alarm system.
Table 13 AC Branch Circuit Requirements
Unit Type
Number
of Units
Current Draw
(amps)
Total Current
AFP-100 or
AFP-100E
1
X
2.3 (AFP-100)
1.2 (AFP-100E)
=
CHG-120
Charger
[ ]
X
2.0
=
XRM-24(E)
Transformer
[ ]
X
1.0
=
Total AC Branch Current Required
=
Amps
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