Mircom FA-300 Series Installation Manual download pdf (Page 34)

Field wiring

Table 4: Indicating Circuit Wiring

Four-Wire Smoke Power (regulated)

4-wire smoke power is provided for 4-wire smoke detectors. This filtered supply is supervised therefore a short will

disconnect the power through the relay until the “RESET” key is pressed. This supply is rated at 22.3VDC regulated/

300mA max/1V voltage drop maximum.

Supervised Auxiliary Power (regulated)

Supervised auxiliary power is used to power the remote annunciators and smart relay modules. This filtered circuit is

supervised therefore a short will disconnect the power through the relay until the “RESET” key is pressed. This

supply is rated at 22.3VDC regulated/500mA max/1V voltage drop maximum.

Auxiliary Power (unregulated)

This unregulated supply is not supervised. This supply is rated at 24VDC/1.7A max. If there is a short on this circuit,

the auxiliary power does not recover automatically when the short is removed. The main power must be

disconnected, then reconnected and the panel reset to re-establish the auxiliary power supply.

Total

signal

load in

amperes

Maximum wiring run to last device

Max. loop

resistance

in ohms

18 AWG 16 AWG 14 AWG 12 AWG

Feet Meters Feet Meters Feet Meters Feet Meters

0.06 2350 716 3750 1143 6000 1829 8500 2591 30

0.12 1180 360 1850 567 3000 915 4250 1296 15

0.30 470 143 750 229 1200 366 1900 579 6

0.60 235 71 375 114 600 183 850 259 3

0.90 156 47 250 76 400 122 570 174 2

1.20 118 36 185 56 300 91 425 129 1.5

1.50 94 29 150 46 240 73 343 105 1.2

1.70 78 24 125 38 200 61 285 87 1.0

Notes:

• For Class A wiring the resistance in ohms is multiplied by two.

• Maximum voltage drop should not exceed 1.8 volts.

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Mircom FA-300 Series Installation Manual Page 34