18/6 Shielded Wire 18AWG 6 Conductor 100FT Plenum Cable - Flexible

In this review of the 18/6 Shielded Wire 18AWG 6 Conductor 100FT Plenum Cable the bottom line is simple: this cable is aimed at installers and technicians who need a flexible, reliable shielded low-voltage run for alarms, fire systems and audio/communication lines. The reviewer found the stranded pure copper conductors deliver noticeably better conductivity and flexibility than CCA alternatives, while the CMP/CL3P plenum jacket adds fire-safe routing options for commercial or multi-dwelling installations.

Key Features

• 100 ft length: Provides a long single-run spool that reduces the need for joins on typical alarm and security runs.
• Stranded pure copper: Offers improved conductivity and corrosion resistance over copper-clad alternatives, helping sensors and devices communicate reliably.
• Shielded 6 conductors: Built-in shielding reduces interference on multi-conductor runs for audio, intercom and alarm circuits.
• Plenum-rated jacket: CMP/CL3P/FPLP flame-retardant construction permits routing in plenum spaces where fire performance is required.
• Wide temperature range: Rated to operate from about -10C/14F to 90C/194F, suitable for most indoor service environments.
• 300 V rating: Meets common low-voltage system expectations for alarm and control circuits.

Who It's For

This cable is best for professional installers, electricians and advanced DIYers who run alarm systems, fire detectors, access control, intercoms or small PA lines and need shielded, plenum-rated wiring to meet building requirements. The combination of stranded pure copper and shielding makes it especially useful where signal integrity matters over longer or parallel runs.

Those who only need a short, non-shielded patch or who work exclusively outdoors should look elsewhere; this product is specified for indoor low-voltage applications and plenum routing rather than direct burial or outdoor exposure.

Pros & Cons

Pros

• Stranded pure copper conductors improve conductivity and make the cable more flexible for tight routing.
• Plenum-rated CMP/CL3P jacket increases fire safety in air-handling spaces and commercial installs.
• Shielding and six conductors provide versatility for alarm, intercom and communication uses with reduced interference.
• 100 ft spool reduces the need for splices on common runs.

Cons

• Not intended for outdoor or direct-bury applications since the jacket is specified for indoor plenum use.
• At 18 AWG, it is designed for low-voltage signaling and not for higher-current power delivery.

Specifications

Length	100 ft
Conductor	18 AWG stranded pure copper
Conductors	6, shielded
Jacket Rating	CMP / CL3P / FPLP plenum-rated
Rated Voltage	300 V
Operating Temperature	-10C/14F to 90C/194F

Our Verdict

The 18/6 Shielded 18 AWG plenum cable is a practical choice for installers who need reliable signal runs in commercial or multifamily buildings where plenum routing and shielding matter. Its stranded pure copper conductors and flame-retardant jacket make it good value for alarm, fire detector and communication wiring; just avoid outdoor or high-current uses.

Frequently Asked Questions

Is this cable suitable for plenum spaces?
Yes, the cable carries a CMP/CL3P/FPLP plenum-rated jacket designed for routing in plenum air-handling spaces.

Can this run power for devices?
No, this is an 18 AWG low-voltage signal cable rated 300 V and intended for alarms, controls and communication rather than high current power delivery.

Will the shielding help with interference?
Yes, the built-in shielding reduces electromagnetic interference on multi-conductor runs, which helps maintain signal integrity for alarms and audio lines.