Fire-Lite ECC-FFT Firefighters Telephone - Manual (Page 20)

20 ECC-FFT Instruction Manual — P/N LS10031-000FL-E:B 9/4/2013
Installation Audio Phone Circuit Installation
Example 1: To select device address 10, turn the ONES rotary dial to 0 and the TENS rotary dial to
1 as shown below.
Example 2: To select device address 42, turn the ONES rotary dial to 2 and the TENS rotary dial to
4 as show below.
2.8 Audio Phone Circuit Installation
2.8.1 Maximum Number of Devices
The ECC-FFT supports up to 24 zones. Each zone consists of one addressable monitor module
(MMF-301) and a minimum of one Fire Fighter Telephone Jack (FPJ-F).
2.8.2 Wiring Requirements for the Audio Telephone Circuit
No special wire is required for the Audio Telephone Circuit. The wire can be untwisted, unshielded,
twisted or shielded as long as it meets the National Electric code 760-51 requirements for power
limited fire protective signaling cables.
54 Ohm maximum impedance - 12 to 18 AWG.
Twisted, shielded wire is recommended for maximum protection against EMI and AFI emissions
and susceptibility.
If using shielded cable, attach the shield to Grounding Stud below TB6 of the FFT.
Example 1: MMF-301 SLC Device set to Address 10
Example 2: MMF-301 SLC Device set to Address 42
NOTE: Do not ground the shield on both ends.