Technical data

Chapter 4: Installation

SP40S Multi-Function Facility Communication System Manual, Revision L

4.5 Wiring the System

4.5.1 Wiring Guidelines

Although the SP40S panel incorporates signal verification and noise filtering circuitry on its inputs, induced

voltages or noise on the input wiring can cause improper operation. Therefore, use shielded twisted pair wire for

all dry contact input wiring.

 Connect the shield of each cable only at one end.

 Connect each shield of each cable that connects to the panel to the grounding points provided near the

knockout locations on the chassis (see Figure 4-2).

The National Electrical Code defines two types of circuits for protective signaling systems: power limited

circuits and non-power limited circuits. All outputs (STB OUT, AUDIO OUT, and ± 24VDC auxiliary power

source) are power-limited circuits.

WARNING: Route all SP40S Multi-Function Facility Communication System

audio wiring away from any high voltage or high current wiring (such as AC or DC

power wiring, audio power wiring, and motor or relay actuation wiring). Failure to

do so may cause electrical shock, resulting in serious injury or death to you and/or

others.

CAUTION: The National Electric Code limits the maximum number of conductors that can be

installed in conduit and wiring boxes depending on the size of the conduit, the volume of the

boxes, and the gauge of the wire used. Make sure that wiring used for SP40S installation

complies with the latest NEC, NFPA, Local, State, County, or Province requirements.

4.5.2 Field Wiring Connections

All SP40S wiring terminals are designed to accept #12 AWG through #18 AWG wiring for one wire per

terminal or #16 AWG to #18 AWG for two wires per terminal. Proper wire gauge considerations for the

Notification Circuit must take into account current requirements versus length of run.

NOTE: Only speakers with DC blocking capacitors provide for proper speaker supervision.

4.5.3 Preparing a System Wiring Diagram

Prepare a system-wiring diagram to include all Notification Appliances, and internal connections and power

sources as required.

NOTE: Separate the AC input power wiring from the other input and output wiring. Wire the AC input power to

the left side of the motherboard (Figure 4-13) and the other input and output wiring to the right.