Honeywell HPFF12 Operation Manual - Page 48
Power Supply Requirements, 6.1 Overview, 6.2 Calculating the AC Branch Circuit Current - battery calculator
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Section 6: Power Supply Requirements 6.1 Overview This section contains instructions and tables for calculating power supply currents in standby and alarm conditions. This is a four step process, consisting of the following: 1. Calculating the total amount of AC branch circuit current required to operate the system 2. Calculating the power supply load current for non-alarm and alarm conditions and calculating the secondary (battery) load 3. Calculating the size of the batteries required to support the system if an AC loss occurs 4. Selecting the proper batteries for your system. This section also contains related calculations for NAC circuits; see Section 6.5, "NAC Circuit Loop Wiring Requirements". 6.2 Calculating the AC Branch Circuit Current The power supply requires connection to a separate, dedicated AC branch circuit, which must be labeled FIRE ALARM. This branch circuit must be connected to the line side of the main power feed of the protected premises. No other non-fire alarm 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 power supply. Overcurrent protection for this circuit must comply with Article 760 of the National Electrical codes as well as local codes. Use 14 AWG (2.08 mm²) wire with 600 volt insulation for this branch circuit. Use Table 6.1 to determine the total amount of current, in AC amperes, that must be supplied to the system. Device Type Number of Devices Current Draw (AC Amps) Total Current per Device HPFF12/HPFF12CM or HPFF12E/HPFF12CME # 5.0 X or = 2.80 ( ) ( ) X ( ) = ( ) ( ) X ( ) = Sum Column for AC Branch Current Required = Table 6.1 120/240 VAC Branch Circuit Requirements 48 HPFF12 NAC Expander - P/N 53576:B 11/24/2010