SYSTON 18/2 Shielded Plenum Control Cable CMP/CL3P - 300V

In this review of the SYSTON 18/2 Shielded Plenum Control Cable the bottom line is straightforward: this is a purpose-built, plenum-rated control cable for installers and facilities managers who need reliable low-voltage wiring with strong EMI protection. The reviewer found it best suited to fire alarm, security and public address runs where safety ratings and signal integrity matter most, and the single biggest reason to buy is the combination of CMP plenum rating and continuous aluminum foil shielding that keeps sensitive signals clean in ceiling plenums and air-handling spaces.

Key Features

• Plenum rated CMP: The cable carries a high flame retardant grade suitable for plenum spaces, offering safer installation in ceilings and air distribution areas.
• Stranded pure copper conductors: Stranded bare copper conductors provide dependable conductivity and flexibility for routing through tight runs and conduit.
• Aluminum foil shielding: A continuous foil shield reduces electromagnetic interference so alarm and communication signals remain clear.
• 300V CL3 rating: The 300V insulation and CL3 classification match common low-voltage, power-limited circuits used in security and A/V systems.
• Multiple application support: Rated for fire alarm, security, intercoms, telephone stations, access control and nurse call wiring, reducing the need for different cable types on a job.

Who It's For

This cable is aimed at electrical contractors, system integrators and building maintenance teams who run low-voltage control circuits in commercial or institutional buildings where plenum-rated cable is required. Its shielding and copper conductors make it a practical choice for installations near motors, fluorescent lighting or other EMI sources where signal integrity matters.

It is less relevant for DIY home runs where plenum rating is unnecessary or for high-power applications outside the cable's CL3/300V power-limited scope. Installers who need thicker gauge power conductors or unshielded bundles for simple residential lighting may prefer alternate wiring.

Pros & Cons

Pros

• Plenum CMP rating provides the highest flame retardant protection for ceiling and air-handling spaces.
• Shielding delivers measurable EMI protection, keeping signals reliable in noisy environments.
• Stranded 100% copper conductors offer good flexibility and conductivity for installation and long-term performance.
• Versatile for many low-voltage systems, reducing inventory complexity for professional installers.

Cons

• The conductor bundle is described by some users as relatively thin, so routing over long distances may require attention to voltage drop for certain uses.

Specifications

Our Verdict

The SYSTON 18/2 shielded plenum control cable is a practical, cost-effective choice for professionals needing a plenum-rated, EMI-resistant control cable for low-voltage systems. Its combination of pure copper conductors and continuous shielding makes it especially good value for commercial alarm and communication installs where safety and signal clarity are priorities.

Frequently Asked Questions

Is this cable suitable for plenum ceiling runs?
Yes. The cable carries a CMP plenum rating designed for use in air-handling plenums and ceilings.

Can it be used for security and fire alarm circuits?
Yes. It is specified for fire alarm, burglar alarm and other power-limited low-voltage circuits.

Does the shielding prevent interference?
The aluminum foil shield reduces EMI on sensitive communication and alarm lines, improving signal reliability in electrically noisy environments.