SYSTON 18/3 Fire Security Control Cable CMP/CL3P - Plenum Wire

Our review of the SYSTON 18/3 Fire Security Burglar Station Sound Alarm Control Cable finds it most useful for installers and facilities managers who need a tough, plenum-rated control cable for low-voltage building systems. The single biggest reason to buy is its CMP/CL3P plenum rating combined with stranded 100% copper conductors, which gives peace of mind when running cable in ceiling plenums or other air-handling spaces while keeping reliable conductivity for alarms, intercoms and access control.

Key Features

• Plenum-rated CMP/CL3P: The cable meets the highest flame retardant grade for plenum spaces so it can be routed in ceiling and air-distribution areas with reduced smoke and flame risk.
• Stranded 100% Copper Conductors: Stranded bare copper conductors provide consistent conductivity and flexibility for easier pulling and termination in tight runs.
• Multiple Low-Voltage Uses: Designed for fire alarms, burglar stations, public address, intercoms, telephone stations and other power-limited circuits used in commercial and residential buildings.
• UL/ETL and Standards Compliance: Constructed to comply with NEC 725 & 800 and UL standards such as UL 13 and UL 444, helping meet code requirements for many installations.
• 300V CL3 Rating: The 300V insulation rating supports Class 3 power-limited systems, giving an extra safety margin for security and A/V installs.

Who It's For

The SYSTON 18/3 CMP cable is aimed at professional installers and building maintenance teams who need a plenum-rated, flame-retardant control cable for fire alarm systems, access control and intercoms in commercial or multifamily properties. Its stranded copper construction also suits retrofit runs where flexibility and reliable conductivity matter.

Home hobbyists doing small low-voltage projects may find the plenum rating and code compliance more than they need and could opt for a simpler, less costly cable for non-plenum applications. Also, if a shielded cable is required for long runs with high EMI concerns, choose a shielded alternative because this product is unshielded.

Pros & Cons

Pros

• Plenum-rated CMP/CL3P construction reduces flame and smoke risk when run in building air plenums.
• Stranded bare copper conductors offer good conductivity and ease of handling during installation.
• Meets multiple code and safety standards including UL listings and NEC articles relevant to control wiring.
• Versatile for a wide range of low-voltage, power-limited applications from alarms to nurse call systems.

Cons

• Unshielded design may not suit installations needing extra protection from electromagnetic interference.
• Some users report the conductor diameter feels thin for certain uses, so verify mechanical strength for long unsupported spans.

Specifications

Conductor	Stranded bare copper
Configuration	18/3 (three conductors, 18 AWG)
Flame Rating	CMP / CL3P / FT6 (Plenum Rated)
Voltage Rating	300V (CL3)
Standards	NEC 725 & 800, UL 13 & UL 444, NFPA 262
Listing	UL and/or ETL listed, RoHS compliant

Our Verdict

The SYSTON 18/3 plenum-rated control cable is a sensible choice for contractors and facilities staff who must run low-voltage control wiring in air plenums and require code-compliant components. It pairs flexible stranded copper conductors with strong flame-retardant properties, delivering good value for safety-focused installations; choose a shielded or heavier gauge option if EMI or mechanical robustness is a higher priority.

Frequently Asked Questions

Can this cable be used in ceiling plenum spaces?
Yes. The CMP/CL3P plenum rating and NFPA 262 flame test compliance make it suitable for air-distribution plenums.

Is the cable shielded for noise protection?
No. This product is unshielded, so pick a shielded cable if you expect significant electromagnetic interference.

What systems is this cable intended for?
It is intended for low-voltage, power-limited systems such as fire alarms, burglar stations, intercoms, public address, telephone stations, access control and similar applications.