Releasing Circuits; Annunciators; Four-Wire Smoke Power (Regulated); Supervised Auxiliary Power (Regulated) - Mircom FR-320 Series Installation And Operation Manual

6.10

Releasing Circuits

The numbers in this table represent the entire loop length

Table 5 Releasing Circuits Wiring Table

MAXIMUM WIRING RUN TO LAST DEVICE
(ELR)
16AWG
ft m
487 148
6.11

Annunciators

The numbers in this table represent the entire loop length.

Table 6 RS-485 Wiring to Annunciators and other Devices

Wire gauge
AWG
22
20
18
i
Notes: Use twisted shielded pair,
300mA power limited.
Maximum 40 Ω loop resistance
6.12

Four-Wire Smoke Power (regulated)

Four-wire smoke power is provided for four-wire smoke detectors and is rated at 100mA
maximum. This filtered supply is supervised therefore a short will disconnect the power and
the common trouble is active. The power is reconnected after the 'RESET' key is pressed. See
Appendix C: Specifications on page 90 for more details.
6.13

Supervised Auxiliary Power (regulated)

Supervised auxiliary power is used to power the remote annunciators and smart relay
modules and is rated at 300mA maximum. This filtered circuit is supervised therefore a short
will disconnect the power and the common trouble is active. The power is reconnected after
the 'RESET' key is pressed. See Appendix C: Specifications on page 90 for more details.
6.14

Unfiltered Supply (full wave rectified)

This unregulated supply is not supervised and is rated at 1.7A maximum. If there is a short on
this circuit, the auxiliary power does not recover automatically when the short is removed. This
power supply must be disconnected, then reconnected and the panel reset to re-establish the
auxiliary power supply. See Appendix C: Specifications on page 90 for more details.
14AWG 12AWG
ft m ft
774 236 1231
Maximum wiring run to last device
Feet
2000
4000
8000
MAX. LOOP
RESISTANCE
m Ohms
375 3.9
Meters
609.6
1219.2
2438.4
31