Oxygen-free cables use copper conductors to support signal and power connections in security, alarm, audio, and networking systems, including keypads, sounders, strobes, intercoms, control panels, and Cat 5e data links. Available in stranded, unshielded configurations with general-purpose, riser, or plenum ratings, they give installers options for routing cable through different building spaces and project types.

Choose conductor gauge based on the equipment’s current requirements and cable length, with 18 AWG supporting higher loads over longer runs than 22 AWG in many security and control applications. Select two, four, or six conductors based on the number of circuits or signals, while Category 5e cable uses four twisted pairs for network connections.

Riser-rated oxygen-free cables, such as CMR or CL3R, are designed for vertical runs between floors, while plenum-rated cables, such as CMP or CL3P, are intended for air-handling spaces where the cable jacket must meet stricter fire and smoke requirements. General-purpose oxygen-free cables, such as CL2, are suited to installations that do not require riser or plenum ratings, so select the rating based on the pathway and local code requirements.

When choosing stranded oxygen-free cables for an in-wall installation, match the cable rating to the space, such as riser-rated CMR or CL3R cable for riser applications and plenum-rated CMP or CL3P cable where required by code. Also consider conductor gauge and count for the connected security, alarm, intercom, control, or audio equipment, along with required cable length and a jacket or box design that supports smooth pulling.