Technical data

Chapter 4: Installation
Series SPB Audio Boosters Manual, Revision A
4-20
4.4 Wiring the Panel
4.4.1 Wiring Guidelines
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.
• Connect AUD-IN with 1V, 25V, or 70.7V input and STB-IN, AUX IN and TROUBLE
CONTACTS with 8VDC to 33VDC inputs to a power-limited source. AC, BATTERY
and DC OUT are non-power limited circuit.
WARNING: Route all Series SPB Audio Booster 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 installation complies with the latest NEC, NFPA, Local,
State, County or Province requirements.
4.4.2 Field Wiring Connections
All wiring terminals are designed to accept #12 AWG through #18 AWG wiring. Proper wire
gauge considerations for the Notification Circuit must take into account current requirements
versus length of run.
4.4.3 Visual Notification Appliance Output Wiring
(SPB-80/4 only)
Wire gauge selection involves consideration of all factors including, wire loop length, maximum
current draw of each appliance, number of appliances, and maximum voltage drop allowable. The
SPB-80/4 has two strobe regulated NAC circuits, while the SPB-160 and SPB-320 have none.
Each strobe NAC has a regulated 24VDC, 2.0 Amps maximum output.
Strobe NAC meets Class B supervision requirements for notification appliance circuits.
For the strobe output circuit, install a UL Listed 10K Ohm, 1/2W EOLR across the last visual
notification appliance. If the output is unused, place a UL Listed 10K Ohm, 1/2W EOLR across
the output terminals.