Instruction manual

3-9
WARNING: TWO DIFFERENT SOURCES OF POWER MAY BE CONNECTED TO THIS UNIT.
DISCONNECT BOTH SOURCES OF POWER BEFORE SERVICING. FAILURE TO DISCONNECT
BOTH POWER SOURCES BEFORE SERVICING COULD RESULT IN PROPERTY DAMAGE,
SERIOUS INJURY, OR DEATH TO YOU AND/OR OTHERS.
WARNING: ALWAYS APPLY AC VOLTAGE BEFORE APPLYING BATTERY BACKUP
VOLTAGE. FAILURE TO DO SO MAY CAUSE DAMAGE TO THE SP40/2 PANEL.
7. Perform System Checkout Procedures as described in Section 3-6 System Checkout on Page
3-14.
Section 3-4 – Prepare a System Wiring Diagram
Wiring Guidelines
Although the SP40/2 panel incorporates signal verification and noise filtering circuitry on their 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.
The shield of each cable should be connected only at one end. Each shield of each cable that
connects to the SP40/2 panel is to be connected to the grounding points provided near the
knockout locations on the chassis (see Figure 3-14 on Page 3-14).
The National Electrical Code defines two types of circuits for protective signaling systems: power-
limited circuits and non-power limited circuits. All SP40/2 outputs (STB OUT, AUDIO OUT, and
±24VDC auxiliary power source) are power-limited circuits.
WARNING: ALL SP40/2 AUDIO WIRING SHOULD BE ROUTED 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 PROPERTY DAMAGE AND 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 SP40/2 installation complies with the
latest NEC, NFPA, Local, State, County or Province requirements.
Field Wiring Connections
All SP40/2 wiring terminals are designed to accept #12 AWG through #22 AWG wiring for one
wire per terminal or #16 AWG to #22 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 will provide for proper speaker
supervision.