Southwire p40040-1c 18/6 Plenum Shielded Thermostat Cable 500 Ft

Product Description

The SOUTHWIRE p40040-1c is an 18 AWG, 6-conductor stranded thermostat cable rated for plenum (CL2P) installations in low-voltage, power-limited circuits. The cable includes a foil shield for signal integrity in noise-sensitive applications and is rated for 300 volts. It ships on a 500-foot spool in a white jacket. Licensed electricians and HVAC technicians install this cable in commercial and residential buildings where air-handling plenum spaces require flame-retardant, low-smoke wiring per NEC standards.

This cable is suited for remote control, signaling, and power-limited circuit applications including security systems, audio and sound distribution, public address systems, intercom wiring, alarm circuits, and access control. The CL2P plenum rating qualifies it for use in HVAC air-handling spaces and return-air plenums where standard CL2 or CL3 cable is not permitted. The 500-foot spool length makes it practical for larger commercial rough-in jobs.

Key Features

• CL2P plenum rating meets NEC requirements for installation in air-handling spaces
• 18 AWG stranded conductors for flexibility during pull and termination
• 6-conductor configuration supports multi-zone or multi-function low-voltage wiring
• Foil shield reduces interference in security, audio, and signaling circuits
• 300-volt rating for power-limited circuit compliance
• 500-foot spool minimizes mid-run splices on larger installations

Compatibility

Designed for use in low-voltage, power-limited circuits including thermostat control, security, intercom, alarm, public address, and access control systems where a CL2P plenum-rated shielded cable is required.

Installation Notes

Installation should be performed by a licensed electrician or qualified HVAC technician in accordance with NEC Article 725 governing Class 2 and Class 3 remote-control and signaling circuits. Verify that the plenum rating is required by local code before substituting a standard CL2 cable. De-energize all circuits before making terminations and ensure the foil shield drain wire is properly grounded at one end to avoid ground loops in shielded signal runs.

Technical Specifications

• AWG: 18
• Conductors: 6
• Wire Type: Stranded Thermostat Wire
• Cable Rating: CL2P (Plenum)
• Voltage Rating: 300 volts
• Shield: Foil shielded
• Jacket Color: White
• Spool Length: 500 feet

Standard Information

• Brand: SOUTHWIRE
• Manufacturer Part Number: p40040-1c