1. Wired Interconnection Smoke Alarm System Cable Requirements

Cable Type Specifications Application Standard
RVVP Shielded Cable 3×1.0mm² (power/signal/ground) Commercial/residential backbone GB/T 5023-2008
FPLP Flame-Retardant Cable 18AWG (2.0mm²) LSZH High-rise building shafts NFPA 70 Article 760
J-YSTY Telephone Cable 2×0.8mm² twisted pair Traditional alarm panel interconnect EN 50200

2. Core Performance Indicators

2.1 Electrical Characteristics

  • Conductor resistance:≤36Ω/km (at 20℃)
  • Insulation resistance:≥100MΩ·km (500V DC)
  • Withstand voltage:1500V AC/1min no breakdown

2.2 Physical Characteristics

  • Operating temperature:-30℃~70℃
  • Bending radius:≥6×cable diameter
  • Tensile strength:≥80N/mm²

3. Cable Selection by Protocol

3.1 Traditional Dry Contact Interconnect

  • 3-core cable:
    • Red:12-24V DC power (16AWG)
    • Black:COM common terminal
    • Yellow:Signal transmission (requires shielding)

3.2 Digital Bus Systems (e.g. Honeywell Notifier)

  • Requirements:
    • Twisted pair (22AWG)
    • Characteristic impedance 120Ω
    • Capacitance ≤50pF/m

3.3 Power over Alarm (PoA)

  • Composite cable:
    • Power:18AWG×2
    • Data:24AWG twisted pair
    • UL 1424 certification required

4. Installation Standards

4.1 Wiring Distance Limits

  • Unshielded cable:≤100m (24V system)
  • Shielded twisted pair:≤300m (RS-485 protocol)
  • Fiber optic conversion:up to 2km (OM1 multimode required)

4.2 Construction Requirements

  • Separation from power lines:
    • Parallel runs ≥300mm
    • Crossings ≥100mm
  • Conduit fill ratio:≤40% cross-section
  • Termination:Crimped gold-plated terminals required

5. Recommended Brands/Models

5.1 Commercial Grade

  • Panduit F1XT Series
  • CommScope FIREGUARD

5.2 Residential Grade

  • Putian Building Intelligence Cable
  • Siemon F3 Series

6. Frequently Asked Questions

Q:Can Ethernet cable be used as substitute?

A:Only Cat5e+ shielded twisted pair meeting:

  • Conductor size ≥24AWG
  • DC resistance ≤9.38Ω/100m
  • UL 2196 fire test certification

Q:How to select cables for retrofit projects?

A:Recommended options:

  • Armored flat cable (surface mounting)
  • FPLR cable with self-adhesive shielding
  • Compliant with GB/T 19666-2019 flame retardant standard

Note: Critical areas require redundant wiring (ring/star topology). All cables must pass:

  • Continuity test (≤1Ω loop resistance)
  • Insulation test (≥500MΩ@500V DC)
  • Protocol compliance test (e.g. LPCB certification for EST3 systems)