Siemens FC924 User Manual

FS20 Marine Fire Detection Control Panel
114
Siemens Industry, Inc. A6V10519176_enUS_b
Building Technologies Division
23 Wiring Specifications for FS20 Fire
All wiring must comply with local and national codes and use stranded
twisted pair wiring.
1. Intermixing of field wiring cable types is allowed.
2. Radiated and Conducted Emissions Protection is achieved by the EMI Filter in the enclosure.
3. For all Signaling Line Circuits (SLCs)
• All SLCs are rated Power Limited, and should be wired in accordance with applicable codes.
• The minimum permitted wire size is 18 AWG, maximum 14 AWG.
• Multiple SLCs within the same cable or metal raceway do not have to be individually shielded.
• The maximum line resistance: Style 4 (Class B) circuit (all wires) is 100 ohms.
o Style 6 (Class A) circuit, acceptable resistance is 100 ohms, 25 ohms per line
o Refer to the ALD-21 Loop Configuration Guide.
• The maximum acceptable line capacitance for SLC is:
o 0.4 UF Line to Line
o 0.8 UF Line to Ground
4. Non-addressable Initiating Device Circuits
• All SLCs are rated Power Limited, and should be wired in accordance with applicable codes.
• The minimum permitted wire size is 18 AWG, maximum 14 AWG.
• The maximum acceptable line resistance per module is as follows:
o Style D (Class A) – 70 ohms maximum 17.5 ohms per line. If a Relay Base is utilized, 40
ohms maximum, 10 ohms per line
o Style D (Class A) – 35 ohms maximum, 8.7 ohms per line. Style B (Class B) both wires,
maximum resistance is four ohms. Style D (Class A) maximum resistance is one ohm per
wire.
o Maximum Capacitance 0.04 UF Line to Line. Maximum Capacitance 0.08 UF Line to
Ground.
Note: Reference U.S. Coast Guard Approval Equipment list.
• Parallel wiring (T-tapping) is not approved on any of the above style.
5. Local Network Communication Circuits (i.e. FS20 Fire to Remote Annunciator)
• Minimum wire size permitted is 18 AWG, maximum is 14 AWG
• The Maximum acceptable:
o Line capacitance is 0.33 UF Line to Line and 0.66 UF Line to Ground for each network
pair.
• Parallel wiring (T-tapping) is not allowable unless the REP-1 is utilized. Each REP-1 provides two
(2) Style 4 Circuits providing an additional 80 ohms line resistance.
• 120 ohm, ¼ watt resistors must be placed at each end of the network circuit .

Siemens FC924 Specifications

General

Brand	Siemens
Model	FC924
Category	Control Panel
Language	English