Siemens FC2025 Manual page 90

FS20 Marine Fire Detection Control Panel
Class B (style 4)
Wiring diagram FCA2016-U1 class B (style 4)
For further details of wiring for the modules for the RS-485 circuit, are located in the descriptions
of the corresponding modules.
90
Siemens Industry, Inc.
Building Technologies Division
Wiring Diagram RS-485 Network:
Class B (style 4)
RS-485 Network, supervised for ground fault, open and short circuit

Class B circuits (style 4) must not exceed a maximum of 65 ft

Class B circuits (style 4) must be terminated with 120 Ω

Observe polarity for circuits A and B

Power limited accessory to NFPA 70 / NEC 760 / Subchapter J of

Title 46 of the Code of Federal Regulations
Ground faults detected at <1 kΩ

All wiring in accordance of article 760 of NEC or local building code

Class A circuits of style 6 must not exceed a maximum of 3940 ft

Observe polarity for circuits A and B

Ground faults detected at <1 kΩ

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