ADT Unimode 400 Multi-Net Installation Manual page 203

Unimode 400 Installation PN 50710:A 10/22/97
Follow these guidelines when wiring the AC branch circuit current:
• The control panel requires connection to a separate dedicated AC fire alarm circuit,
which must be labeled "Fire Alarm."
• The AC power circuit must connect to the line side of the main power feed of the
protected premises.
• Do not power other equipment from the AC fire alarm circuit.
• The AC power circuit wiring must run continuously, without any disconnect
devices, from the AC power source to the control panel.
• Overcurrent protection for this circuit must comply with Article 760 of the
National Electrical Code as well as local codes.
• Use 12 AWG wire with 600-volt insulation for the AC power circuit.
Use Table G-1 to determine the total amount of current, in AC amperes, that a 120 VAC,
50/60 Hz service must be able to supply to the fire alarm system. Devices rated for
240 VAC operation will draw one-half the current listed in Table G-2:
Device Type No. of Devices
036 >  @
$936 >
$$ >
$$ >
55HPRWH %DWWHU\ >
&KDUJHU
6XP FROXPQ IRU $& %UDQFK &XUUHQW UHTXLUHG DPSV
7DEOH *  9$& )LUH $ODUP &LUFXLW
The MPS-400 must be able to power all internal system devices (and several external
types of devices) continuously during non-fire alarm conditions. Use column 1 in Table
G-2 to calculate the Non-Fire Alarm Load on the MPS-400 regulator when applying
primary power. The MPS-400 must provide a finite amount of additional current
during a fire alarm condition. Use column 2 in Table G-2 to calculate the additional
current needed during fire alarms. The requirements for non-fire alarm and fire alarm
current loads cannot exceed the capabilities of the MPS-400 listed below:
• 3 A at 24 VDC during Standby; and
• 6 A at 24 VDC during Alarm.
Current (amps)
; 
@ ; 
@ ; 
@ ; 
@ ; 
Total Current

G-1