18 AWG 3-Conductor Plenum Shielded Control Cable - CMP 300V

In this review the focus is on a plenum-rated, shielded control cable intended for low-voltage systems; it is best suited for installers, electricians, and facilities managers who need a reliable, EMI-resistant conductor for fire, security and communication wiring. The reviewer found the cable notable for its combination of stranded bare copper conductors and full aluminum foil shielding, which keeps signals clean in environments with potential interference. Overall this cable is a practical choice when safety (plenum use) and signal integrity are the top priorities.

Key Features

• Plenum-Rated CMP: The CMP/CL3P/FT6 flame retardant construction allows the cable to be routed in ceiling plenums and air-handling spaces where higher safety standards are required.
• Stranded Pure Copper: Stranded bare copper conductors provide good conductivity and flexibility for easier pulling in conduit and reliable long-term connections.
• Aluminum Foil Shielding: The full foil shield reduces electromagnetic interference so audio, security and alarm signals remain clear over longer runs.
• 300V CL3 Rating: A 300V insulation rating and CL3 classification make the cable suitable for a variety of power-limited, low-voltage control and signaling circuits.
• UV Resistant: The jacket is formulated to resist UV exposure for installations where sunlight or exterior conditions may be present.
• Multiple Applications: Intended for fire alarms, burglar stations, intercoms, public address, access control and similar low-voltage systems where shielded control conductors are required.

Who It's For

This cable is aimed at professionals and advanced DIYers installing or upgrading fire alarm systems, security burglar stations, intercoms and other low-voltage communication circuits who need a plenum-safe, shielded conductor. It is especially useful in commercial and multistory buildings where runs pass through plenum spaces or where EMI could affect sensitive signals.

Those who need heavy-gauge power transmission or unshielded general-purpose building wiring may look elsewhere; this product is optimized for power-limited control and signal circuits rather than mains or high-current uses.

Pros & Cons

Pros

• Good shielding performance that limits external interference for clearer signal transmission.
• Flexible stranded copper conductors that are easy to work with and terminate cleanly.
• Plenum-rated jacket provides a higher level of fire safety compared with non-plenum cable.
• Versatile for many low-voltage systems including alarms, intercoms and access control.

Cons

• Some users may find the cable thinner than expected for certain applications, so confirm gauge and jacket thickness before ordering for specific mechanical needs.

Specifications

Conductors	3 stranded bare copper
Gauge	18 AWG
Shielding	Aluminum foil full shield
Plenum Rating	CMP / CL3P / FT6
Voltage Rating	300V (CL3)
Application	Fire alarm, security, intercom, PA, access control

Our Verdict

This shielded 18 AWG 3-conductor control cable is a sensible pick for anyone needing plenum-rated wiring that protects sensitive signals from EMI while meeting CL3 power-limited standards. It offers flexible stranded copper conductors and full foil shielding at a practical value, making it a good choice for commercial alarm, communication and access control installs where safety and signal integrity matter.

Frequently Asked Questions

Is this cable suitable for plenum spaces?
Yes, it carries CMP/CL3P/FT6 plenum ratings and is intended for use in ceiling plenums and air-handling spaces.

Can it be used for alarm and security circuits?
Yes, the 18 AWG conductors and 300V CL3 rating are appropriate for fire alarm, burglar station and other power-limited security circuits.

Does the shielding prevent interference?
The aluminum foil shield provides full coverage to reduce EMI and help maintain clear signal transmission in noisy environments.