Power Supply Calculations; Overview; Calculating The Ac Branch Circuit - Fire-Lite MS-9200UDLS User Manual

SECTION 7

7.1 Overview

This section contains instructions and tables for calculating power supply currents in alarm and
standby 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-fire and fire alarm conditions and
calculating the secondary (battery) load
3. Calculating the size of batteries required to support the system if an AC power loss occurs
4. Selecting the proper batteries for your system

7.2 Calculating the AC Branch Circuit

The control panel requires connection to a separate, dedicated AC branch circuit, which must be
labeled FIRE ALARM. This branch circuit must connect 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 control panel.
Overcurrent protection for this circuit must comply with Article 760 of the National Electrical
Codes as well as local codes. Use 14 AWG (2.00 mm
branch circuit.
Use Table 7.1 , to determine the total amount of current, in AC amperes (A), that must be supplied
to the system.
Device Type
MS-9200UDLS
or
MS-9200UDLSE
CHG-75
CHG-120F
MS-9200UDLS PN 52750:E1

Power Supply Calculations

Table 7.1 AC Branch Circuit Requirements
Number of
Devices
1
[ ]
[ ]
[ ]
Sum Column for AC Branch Current Required
01/27/09
2
) wire with 600 volt insulation for this
Current Draw
(AC amps)
3.00
X or
1.50
X 2.05
X 2.00
X [ ]
Power Supply Calculations
Total Current
per Device
=
=
=
=
=
187