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

Our review of the SYSTON 18/3 control cable finds it best suited for installers and technicians who need a single, reliable cable for multiple low-voltage, power-limited systems. The biggest reason to buy is its plenum-rated CMP construction combined with stranded pure copper conductors, which delivers both higher flame-retardant safety for ceiling and air-handling spaces and predictable conductivity for fire alarm, security and communication lines.

Key Features

• Plenum-Rated CMP: The cable meets CMP/CL3P/FT6 flame ratings so it can be routed in plenum spaces where higher fire-safety performance is required.
• Pure copper conductors: Stranded bare copper cores provide reliable conductivity and flexibility for pulling through conduit or tight runs.
• Versatile applications: Designed for fire alarm, burglar alarm, intercoms, public address and other low-voltage power-limited circuits, simplifying inventory with one multiuse cable.
• UL/ETL and standards compliance: Constructed to NEC 725 & 800 and UL 13/444 standards and listed to applicable flame tests, supporting code-compliant installs.
• 300V CL3 rating: Insulation rated to 300V and CL3 power-limited classification, suitable for thermostats, access control and similar low-voltage systems.

Who It's For

The SYSTON 18/3 CMP cable is aimed at professional electricians, low-voltage contractors and facilities maintenance teams who need a single cable that is safe to run in plenum spaces and still performs well electrically for alarms and communications. It works well where code compliance and flame rating matter, such as commercial buildings, schools and hospitals.

DIY homeowners doing exposed, non-plenum work or users who require shielded cable for high-noise environments should consider alternate, shielded options. Also, projects that need larger conductor gauges or multi-conductor bundles beyond 18/3 should look for appropriately sized cables.

Pros & Cons

Pros

• High flame-retardant CMP rating allows safe routing in plenum and air-distribution spaces.
• Stranded bare copper conductors give good flexibility and reliable conductivity for low-voltage circuits.
• Wide application range reduces the need to stock multiple specialty cables for alarms, intercoms and access control.
• Listed to UL/ETL and NEC standards, aiding code-compliant installations.

Cons

• Some users report the overall jacket and conductor thickness feels thin for certain pulls, so extra care is needed during installation.

Specifications

Our Verdict

For professionals who need a single, code-friendly cable for fire alarm, security and communication runs in plenum areas, the SYSTON 18/3 CMP cable is a practical choice that balances flame safety and electrical reliability. It offers good flexibility and standard compliance at a competitive value, though those needing thicker jackets or shielded conductors should look elsewhere.

Frequently Asked Questions

Can this cable be used in ceiling plenum spaces?
Yes, its CMP/CL3P/FT6 plenum rating is intended for safe use in air-handling and plenum spaces.

Is the cable shielded for noise protection?
No, this 18/3 variation is unshielded; choose a shielded product if electromagnetic interference is a concern.

What systems is this cable suitable for?
It is suitable for fire alarms, burglar alarms, intercoms, telephone stations, access control, nurse call and other low-voltage power-limited circuits.