18/2 CL3P CMP Plenum Rated Shielded Cable – 500ft Stranded Bare Copper White

18/2 CL3P Plenum Cable – Shielded Stranded Copper 500ft

The 18/2 CL3P plenum cable is a fire-rated, safety-certified solution engineered for low-voltage audio, alarm, and control applications in commercial plenum spaces. With UL-listed Class 3 rating, integrated shielding, and stranded copper conductors, this cable meets stringent building codes while delivering pristine signal transmission where it matters most.

Whether you’re installing voice evacuation systems, security circuits, fire alarm loops, or audio distribution in return-air plenums, CL3P certification ensures your installation passes every inspection. The 500ft spool provides ample coverage for medium-to-large facility retrofits—all with the shielding you need to eliminate EMI interference.

Key Features & Benefits

• CL3P Class 3 Fire-Rated Plenum Construction – UL 2043 listed and NFPA 262 compliant. Meets Class 3 safety standards for plenum installation without conduit protection. Burns at minimal rates with low smoke and toxic gas emissions.
• Shielded Design with EMI Rejection – Integrated shield blocks electromagnetic interference from HVAC equipment, power lines, and RF sources. Critical for audio clarity in mechanically complex spaces.
• Stranded Copper Conductors – Bare stranded copper ensures maximum flexibility and bend radius. Superior conductivity minimizes signal loss over long runs. Easy to terminate with standard connectors.
• 500ft Compact Spool – Right-sized for commercial retrofit projects. No waste, no excess inventory. Professional packaging suitable for on-site storage.
• Commercial-Grade Reliability – Rated for continuous operation in temperature-controlled plenum environments (40–140°F standard). Long-term stability in humidity-resistant insulation jacket.
• Code Inspector Approved – Electricians and building officials immediately recognize CL3P/UL 2043 rating. Your installation passes without callbacks or compromises.
• Easy Termination – Stranded conductors terminate cleanly to barrier strips, screw terminals, and connectors. No crimping surprises, no cold-solder joints.
• Economical Bulk Pricing – 500ft spool reduces per-foot material costs versus smaller gauges or shorter lengths.

Technical Specifications

Installation & Application

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The 18/2 CL3P plenum cable is the standard choice for:

• Fire Alarm Systems – Sensor circuits, loop signaling, and alarm device wiring in return-air plenums.
• Voice Evacuation & Mass Notification – Microphone feeds, amplifier control, and speaker circuits in suspended ceiling spaces.
• Security & Access Control – Door contact loops, motion detector wiring, and control signaling in code-compliant plenum routing.
• Building Automation & HVAC Control – 24V thermostat wiring, damper control circuits, and sensor loops in mechanical spaces.
• Audio Distribution – Low-voltage audio feeds with shielding for clean signal in electrically noisy environments.
• Intercom & Communication Systems – Two-way voice and data signaling for facility management systems.

Installation advantages:

• Flexible stranded construction fits tight spaces and curves
• Shielding eliminates noise from adjacent power equipment
• CL3P rating eliminates expensive conduit requirements
• Standard connectors (screw terminals, RCA, banana) accept stranded conductors
• Professional appearance passes visual inspections

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Quality Assurance & Professional-Grade Reliability

Every 18/2 CL3P plenum cable spool is sourced from UL-certified manufacturers and undergoes rigorous quality verification:

• Conductor Continuity Testing – 100% verification of circuit integrity end-to-end
• Insulation Resistance Measurement – Confirms jacket and shield integrity under load
• Fire Performance Validation – Batch testing confirms NFPA 262 / UL 2043 compliance
• Mechanical Strength Inspection – Tensile and bend-radius testing ensures durability

Long-term Performance: Bare stranded copper resists oxidation in controlled plenum environments, maintaining signal fidelity for 10+ years. The tinned copper shield provides permanent EMI rejection—no degradation under continuous operation.

Professional Installer Confidence: This cable is the choice of commercial integrators, fire alarm contractors, and building system specialists nationwide. When UL 2043 and NFPA 262 certifications appear on your installation documents, inspectors approve without hesitation.

Why Choose Our 18/2 CL3P Plenum Cable?

1. Code Compliance Guaranteed – CL3P/UL 2043 certification satisfies every major building code (IBC, NEC, NFPA).
2. EMI-Free Signal Path – Integrated shield protects against interference in RF and electromagnetically complex facilities.
3. Installer-Friendly Design – Stranded copper terminates easily; tight bend radius fits real-world routing.
4. Right-Sized Coverage – 500ft spool provides sufficient length for most commercial retrofit projects without excess.
5. Proven Long-Term Reliability – Trusted by integrators and facility managers; zero surprise failures under normal operation.

Frequently Asked Questions

Q: What’s the difference between CL3P and CMP plenum rating?
A: CL3P is Class 3 power-limited rating (low-voltage, low-power circuits like alarms and audio). CMP is data/communications plenum. Both are UL-listed for plenum use. Choose CL3P for alarm, audio, and control; choose CMP for network/data.

Q: Can I run this cable without conduit?
A: Yes. CL3P plenum rating specifically allows unprotected installation in plenum spaces (above drop ceilings, in HVAC returns). Conduit is optional but may be required by local code for mechanical protection—verify with your AHJ.

Q: How flexible is the 18 AWG stranded construction?
A: Very flexible. Minimum bend radius is 1.5–2 inches. The 16-strand design allows routing through tight spaces, around structural obstacles, and through existing cable pathways.

Q: Is the shielding effective against electrical noise?
A: Yes. Tinned copper braid shield attenuates EMI/RFI across audio and control frequency ranges. Essential when routing near power lines, HVAC equipment, or wireless systems.

Q: Can I use this for speaker applications?
A: This cable is optimized for low-voltage control and audio signal (under 100V, low current). It is not suitable for powered speaker circuits or high-current applications. Consult your equipment manual.

Q: What gauge wire are the individual conductors?
A: 18 AWG per conductor. This is suitable for 24V control circuits, 70V audio distribution, and alarm signaling up to approximately 100 feet (depending on load).

Q: How do I terminate the stranded conductors?
A: Stranded copper accepts standard barrier strips, screw terminals, and push-in connectors. Tin the strand ends if using older equipment with less-reliable contacts. Crimped connectors are also suitable.

Q: What’s your shipping and lead time?
A: In-stock items ship within 1business days. For bulk orders (10+ spools), contact sales for volume pricing and expedited shipping options.

Q: Is this cable available in other lengths?
A: Yes. We stock 500ft, and 1000ft spools. Custom lengths available on request. Contact sales for availability and pricing.

Q: Does this cable meet Ethernet or data standards?
A: No. This cable is rated for power-limited circuits only (alarm, audio, control). For network/Ethernet applications, use Cat5e, Cat6, or Cat6A plenum cable.

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