Section 3-4 - Panel Wiring - Wheelock SAFEPATH4 Application, Installation, Operation, And Maintenance Manual

CAUTION: Do not connect input voltage to any equipment until the field wiring has been
tested, inspected and approved.
1. Check the integrity of all field wiring. Confirm that specified wiring is installed, and that there
is continuity between required points (no open circuits), with no unwanted shorts to other
conductors, chassis, or earth ground.
a. Verify that the field wiring complies with the instructions of this manual and the detailed
wiring diagram prepared for this installation.
b. Ensure that no unwanted voltages are present on circuit conductors and ground.
c. Test all ungrounded connectors for electrical isolation from ground.
d. Measure and record the resistance of each NAC circuit. Conduct this test reversing
polarity.
2. Calculate and Install properly sized backup batteries as described in Section 3-8 (Page 38)
and 3-9 (Page 40). The SAFEPATH4 Audio Booster is UL approved for 24VDC at 12AH.
3. Perform System Checkout Procedures as described in Section 3-6 System Checkout on
Page 35.
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 PANEL.
Section 3-4 – Panel Wiring
Wiring Guidelines
Although the 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 shall be connected only at one end. Each shield of each cable
that connects to the panel is to be connected to the grounding points provided near the
knockout locations on the chassis (see Figure 3-18 on Page 35).
The National Electrical Code defines two types of circuits for protective signaling systems: power
limited circuits and non-power limited circuits. All outputs (AUD1 OUT, AUD2 OUT, STB1-OUT,
STB2-OUT and EXP OUT) are power-limited circuits. AUD-IN with 25V or 70.7V input and STB-
IN, AUX IN and TROUBLE CONTACTS with 8VDC to 33VDC inputs shall be connected to a
power limited source. AC, BATTERY and DC OUT are non-power limited circuit.
WARNING: ALL SAFEPATH4 AUDIO BOOSTER 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.
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