6 Wiring guidelines
This section contains the wiring guidelines for the LCD Annunciator.
6.1 General wiring guidelines
• All wiring must be copper conductors only.
• Do not use wire lengths in excess of the maximum lengths.
• Underground wiring must be free of water.
• Wires must not be run through elevator shafts.
• You can splice provided you do the following:
- All such connections are soldered with a rosin-core solder, crimped in metal sleeves, or encapsulated with an epoxy resin.
- When solder or crimped metal sleeves are used, the junction is insulated with a high-grade electrical tape as sound as the original
insulating jacket.
- The shield’s continuity is maintained throughout the cable’s length.
• Only system wiring can share the same conduit, see Figure 10 .
6.2 Specific wiring guidelines
• 24 V power wiring must be power limited and communication wiring is supervised and power limited.
• The Remote Annunciator cannot be used with wiring that goes outside the building, above or below ground, unless over voltage
suppression is provided at both ends for both the communication and the power wiring.
Communication and power wiring must meet requirement:
- Model Simplex 2081-9044 overvoltage protectors (200 mA or less).
• For maximum wire lengths with or without circuit protectors, see Table 6.
• If the interconnected control unit is not used to provide operating power to the annunciator, a regulated power-limited, UL-listed 24
VDC power supply for fire protective signaling must be used.
• 14 AWG to 22 AWG twisted pair wiring is required for RS485 communications.
6.3 Wire lengths
• When using multiple annunciators and runs, the total of all runs must not exceed 4000 ft. for bus style wiring.
• For 2050 and 2250 panels, when using multiple annunciators and runs, the total of all runs must not exceed 2500 ft. for T-Tap style
wiring.
• Four 2081-9044 Over Voltage Protectors is the maximum number that can be on any single communication loop.
6.3.1 Calculation of Annunciator wiring distance
In general, the wire length is limited by resistance but for small AWG wires the capacitive component dominates and becomes the limiting
factor. The resistance for each 1000 ft. wire with respect to its AWG, is shown in the following table:
Table 5: Resistance for each 1000 ft wire with respect to AWG
AWG Resistance (ohm) for each 1000 ft, Rref
22 16.14
20 10.15
18 6.385
16 4.016
14 2.25
The LCD ANN maximum distance supported is 4000 ft. (1200 m) regardless of gauge used. This distance decreases as the connected
Annunciator number increases (increase in worst case current consumption). You can use the following formula to find the maximum
supported distance for the used case:
Maximum wire length = (3V / (Rref x MIC)) x 1000 ft.
Where MIC (Maximum Instantaneous Current) can be found out by:
MIC = (0.075 x Number of annunciators) Amps
For instance, number of Annunciator selected = 6; AWG = 18 AWG
MIC (Maximum Instantaneous Current) = 0.075 x 6 = 0.600 A
Maximum wire length = (3V / (6.385 x 0.600)) x 1000 ft. = 1044 ft.
The following table summarizes maximum distance supported for respective AWG with number of annunciators connected:
page 17 579-1434 Rev B
Foundation Series 2606-9101 LCD Annunciator Installation Guide
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