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CNT-SVX07C-EN 7
Chapter 2
General wiring information
This chapter provides specifications and general information about wir-
ing the Tracer ZN521 zone controller. The controller requires wiring for:
• Input/output terminals
• AC power to the controller
• Communication-link wiring, if the controller is to communicate with a
building automation system (BAS)
Input/output terminal wiring
All input/output terminal wiring for the Tracer ZN521 zone controller is
application specific and dependant on the configuration of the controller.
Input/output terminal wiring must meet the following requirements:
• All wiring must comply with the National Electrical Code and local
codes.
• Use only 18 AWG, twisted-pair wire with stranded, tinned-copper
conductors. (Shielded wire is recommended.)
• Binary input and output wiring must not exceed 1000 ft (300 m).
• Analog input wiring must not exceed 300 ft (100 m).
• Do not run input/output wires in the same wire bundle with any ac-
power wires.
For application-specific wiring information and diagrams, see Chapter 4,
“Input/output functions and wiring for typical applications”
AC-power wiring
ƽWARNING
HAZARDOUS VOLTAGE!
Before making line voltage electrical connections, lock open the supply-
power disconnect switch. Failure to do so may cause death or serious
injury.
ƽCAUTION
Make sure that the 24 Vac transformer is properly grounded. Failure to
do so may result in damage to equipment and/or personal injury.