Simplex 4100-0136 Installation Instructions Manual page 15

Wiring Guidelines
Overview
General Guidelines
This section contains guidelines for decoder field wiring.
Make sure these guidelines are accounted for before wiring:
•
All wires must be between 12 and 18 AWG, or as the local code dictates.
- For one decoder, the maximum RUI wiring distance is 2,500 feet for 12 and 14
AWG, and 1,200 feet for 18 AWG.
- RUI communications lines must be 18 AWG, twisted shielded pairs with a maximum
length of 2,500 feet.
•
RUI only: Communications line power: 32 VDC (max), 130 mA (max), 1200 or 9600 baud.
•
RUI only: Power to the decoder must be from a power supply commoned to the main power
supply. Decoder power is 85 mA at 28.5 VDC (nominal), 90 mA at 28.5 VDC (max), no
loops shorted. Alarm current depends on the duty cycle of the coded station. Maximum
current with one loop shorted is 163 mA at 28.5 VDC.
•
Coded station wiring only: Supervised circuit: 28.5 VDC, 8.6 mA.
•
Coded station wiring only: Maximum current: 75 mA (shorted) at 28.5 VDC.
•
Coded station wiring only: Do not connect any other devices to loops. Connect coded devices
or contacts only, to decoder loops.
•
Coded station wiring only: 800 Ohms maximum resistance per loop, including through any
coder contact.
•
All wiring is supervised.
•
Conductors must test free of all grounds.
•
All wiring must be done using copper conductors only, unless noted otherwise.
•
If shielded wire is used,
- the metallic continuity of the shield must be maintained throughout the entire cable
length.
- the entire length of the cable must have a resistance greater than 1 Megohm to earth
ground.
•
Underground wiring must be free of all water.
•
In areas of high lightning activity, or in areas that have large power surges, the
2081-9027 Transient Suppressor should be used on monitor points (refer to 574-803).
•
Wires must not be run through elevator shafts.
•
Wires that run in plenum must be in conduit.
•
Splicing is permitted. All spliced connections must either be soldered (resin-core solder),
crimped in metal sleeves, or encapsulated with an epoxy resin. When soldering or when
crimped metal sleeves are used, the junction must be insulated with UL-listed electrical
tape that is as sound as the original insulating jacket. Shield continuity must be
maintained throughout.
•
A system ground must be provided for earth detection and lightning protection devices.
This connection must comply with approved earth detection per NFPA780.
•
Only system wiring can be run together in the same conduit.
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