AFP-200 Instruction PN 15511:F2 10/11/99 73
A.4 Calculating the System Current Draw
Overview
The control panel must be able to power all internal and external devices continuously during the non-fire alarm
condition. To calculate the non-fire alarm load on the system power supply when primary power is applied, use
Calculation Column 1 in Table A-3. The control panel must support a larger load current during a fire alarm
condition. To calculate the fire alarm load on the power supply, use Calculation Column 2 in Table A-3. The
secondary power source (batteries) must be able to power the system during a primary power loss. To calculate
the non-fire alarm load on the secondary power source, use Calculation Column 3 in Table A-3.
When calculating current draw and the battery size, note the following:
• “Primary” refers to the main power source for the control panel.
• “Secondary” refers to the control panel's backup batteries.
• All currents are given in amperes (A). Figure A-3 shows how to convert milliamperes and microamperes to
full amperes.
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Figure A-3 Converting to Full Amperes
How to Use Table A-3 to calculate system current draws
Use Table A-3 to calculate current draws as follows.
1) Enter the quantity of devices in all three columns.
2) Enter the current draw where required. Refer to the Notifier Device Compatibility Document for compatible
devices and their current draw.
3) Calculate the current draws for each in all columns.
4) Sum the total current for each column.
5) Copy the totals from column 2 and column 3 to Table A-4.
Figure A-4 shows the types of current that you enter into Table A-3:
Calculation Column 2 The primary supply current load that the control panel must support during a fire
alarm condition, with AC power applied. This current draw cannot exceed 5 A.
Calculation Column 3 the standby current drawn from the batteries in a non-fire alarm
condition during a loss of AC power.
Calculation Column 1 The primary supply current load that the control panel must support during a non-fire
alarm condition, with AC power applied. This current draw cannot exceed 1.0 A.
Figure A-4 Calculating the System Current Draws
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