7
General wiring
precautions
•
All wiring
must
be copper conductors only.
•
Do not exceed the maximum wiring lengths specified in the wire length tables in this
document.
•
If shielding is used:
- Maintain the metallic continuity of the shield throughout the entire length of cable.
- The entire length of the cable must have a resistance greater than 1 X 10
6
Ohms to earth
ground.
- Ensure the shield is connected to a SHIELD terminal at each annunciator, and is
terminated only at the main panel.
•
Ensure underground wiring is free of water.
•
Do not run wires through elevator shafts.
•
Wire runs in plenums must be in a conduit unless they are rated for plenum use.
•
Splicing is permitted in the following situations:
- All connections are soldered (rosin-core solder), crimped in metal sleeves, or
encapsulated with an epoxy resin.
- When using solder or crimped metal sleeves, ensure the junction is insulated with a high
grade electrical tape that equals the quality of the original insulating jacket.
- The continuity of the shield is maintained throughout the length of the cable.
•
Do not run other wiring in the same conduit as system wiring.
Specific wiring
precaution
•
Ensure 24V power wiring is power limited.
•
Communication wiring is supervised and power limited.
•
4606-9102 LCD Annunciator wiring that leaves the building, above or below ground,
requires overvoltage suppression at both ends for the communication and the power
wiring. Communication and power wiring must meet the following requirements using:
- A Simplex Model 2081-9044 overvoltage protector (200 mA) or a Simplex Model
2081-9027 (200 mA) isolated loop circuits protector.
- Simplex Model 2081-9028 (5-amp) isolated loop circuit protector.
- For underground wiring, select the appropriate isolated loop circuit protector. Run the
circuit wiring in a separate parallel wiring trough, to separate it from any commercial
power distribution wiring.
- For overhead wiring, select the appropriate isolated loop circuit protector. The wiring is
limited to one contiguous property and the total wire length
must
not exceed 2500 feet
(762 meters). Run the circuit wiring on separate poles, to separate it from any poles
supporting commercial power distribution wiring. Run the wiring in parallel with direct
relation to the commercial power distribution. The separation is a minimum distance,
whichever is greater, of 100 feet (30.48 meters), or the maximum span between any two
adjacent poles of either the system’s circuit or the commercial power distribution circuit.
•
For the maximum wire lengths with or without circuit protectors, see Tables 3 through 6.
Wire length
tables
Table 3 and Table 4 show the maximum wire lengths possible for the power wiring. Table 5
and Table 6 show the maximum wire lengths for the communication wiring.
Note:
•
When using multiple annunciators and runs
,
ensure the total of all runs does not exceed 10,000 feet
(3048 meters), including T-Taps.
•
The maximum number of 2081-9044 over-voltage protectors on a single communication loop is four.
The maximum number of 2081-9028 isolated loop circuit protectors on a single communication loop is
four.
Continued on the next page.
4606-9102 LCD Annunciator installation instructions
