18 AWG 8-Conductor Plenum Shielded Control Cable - 300V CL3P

In this review the reviewer looks at a plenum-rated control cable built for low-voltage systems and finds it best suited for installers and building technicians who need reliable signal integrity in air-handling spaces. The bottom line: this 18 AWG, 8-conductor shielded cable is worth considering when you need plenum-rated safety plus proven shielding performance for fire alarm, security, or intercom installations. Its combination of stranded bare copper conductors and aluminum foil shield addresses common concerns about conductivity and interference without adding unnecessary bulk.

Key Features

• Plenum Rated CMP/CL3P: Designed for use in building plenums and ceiling air spaces, the flame retardant construction provides higher safety than standard commercial cable.
• Stranded Bare Copper Conductors: The 18 AWG stranded 100% copper conductors deliver dependable conductivity and flexibility for routing through conduits and tight spaces.
• Aluminum Foil Shielding: A continuous foil shield reduces electromagnetic interference, keeping signals clear for sensitive communications and alarm circuits.
• 300V CL3 Rating: With a 300V insulation rating and class 3 power-limited compliance, the cable is suitable for thermostats, security panels, and other low-voltage applications.
• UV Resistant Construction: The outer jacket resists UV exposure for installations where sunlight or UV light is a concern during storage or routing.

Who It's For

This cable is aimed at professional installers, building contractors, and facilities managers who must run fire alarm and security wiring through plenum spaces while meeting stricter fire safety codes. It is also a good choice for AV technicians and integrators who want shielded control runs for intercoms, public address, and access control systems.

DIY homeowners or hobbyists who only need a short run for non-plenum home projects may find this cable thicker and higher spec than required; in those cases a standard CMR or CM rated cable could be more cost effective.

Pros & Cons

Pros

• High flame-retardant CMP rating suitable for plenum spaces and strict building codes.
• Good shielding that customers reported keeps signals clean and reduces interference.
• Stranded copper conductors provide flexibility and reliable conductivity for control circuits.
• Versatile for many low-voltage applications including security and nurse call systems.

Cons

• Some users note the cable can feel thin compared with heavier gauge multi-conductor cables, which may matter for mechanical durability in exposed runs.

Specifications

Conductor	18 AWG stranded 100% bare copper
Conductors	8
Shielding	Aluminum foil continuous shield
Rating	CMP / CL3P / FT6 (Plenum Rated)
Voltage	300V (CL3)
Applications	Fire alarm, security, PA, intercom, access control, instrumentation

Our Verdict

This 18 AWG 8-conductor plenum cable is a practical, code-conscious choice for professionals running control and communications wiring in ceiling plenums and other air-handling spaces. It combines reliable copper conductors, continuous shielding, and a high safety rating to deliver good value for security, alarm, and AV installations where signal integrity and fire safety matter.

Frequently Asked Questions

Is this cable suitable for plenum installations?
Yes. It carries a CMP/CL3P/FT6 plenum flame-retardant rating intended for air-handling spaces.

Can this cable be used for alarm and access control systems?
Yes. The 18 AWG stranded copper conductors and 300V CL3 rating make it suitable for fire alarm, burglar alarm, and access control power-limited circuits.

Does the shielding prevent interference?
The aluminum foil shield helps block EMI and maintain clear signal transmission for sensitive communications and low-voltage data lines.