Harrington Signal HS-3200 - Install Manual - Manual (Page 23)

HS-3100/3200 Installation Manual
17
Addressable Circuit Connections
Addressable Class B (Style 4) Circuit
This is a 2-wire supervised Class B (Style 4) communications circuit using addressable devices.
Wire capacitance and resistance will affect the allowable wire length. The recommended wiring is
twisted unshielded pair. Consult Harrington's Applications Department for specific requirements.
Maximum wire lengths are up to 10,000 ft (see Appendix). Devices will be connected as indicated
in the diagram below. Use only approved devices.
Note: T-taps may NOT be allowed by the authority having jurisdiction. Refer to NFPA 72 and ULC-
S524.
Addressable Class A (Style 6) Circuit
This is a 4-wire supervised Class A (Style 6) communications circuit using addressable devices.
The recommended wiring is twisted unshielded pair. Wire capacitance and resistance will affect
the allowable wire length. Consult Harrington's Applications Department for specific requirements.
Maximum wire lengths are up to 10,000 ft (see Appendix). Devices will be connected as indicated
in the diagram below. Use only approved devices. Return wiring must be in a separate conduit.
Note: Install wiring in compliance with NFPA 72.
Figure 6: Class B Wiring
Figure 7: Class A Circuit