Riser-rated 18 AWG 4-conductor cables, marked CL3R, are intended for vertical runs between floors, while plenum-rated cables, marked CL3P, are designed for use in air-handling spaces where stricter flame and smoke requirements may apply. Select the cable rating based on the installation pathway, applicable codes, and the system requirements.

Choose shielded 18 AWG 4-conductor cable when the run may encounter electromagnetic or radio-frequency interference, such as near motors, power wiring, or wireless equipment. Choose unshielded cable for typical security, alarm, intercom, or control runs where interference is less likely and the installation does not require added shielding.

Solid conductors use one continuous metal core and can provide a stable connection for fixed 18 AWG 4-conductor cable runs, such as fire alarm circuits. Stranded conductors use multiple smaller wires, giving the cable more flexibility for routing around equipment, panels, and other areas that may require repeated bending.

Choose a 500-foot or 1,000-foot length based on the planned cable path, with extra cable for routing, terminations, and service loops. Select an express box for tangle- and twist-free dispensing through a punch-out panel, or a wooden reel when that packaging better fits your installation workflow.