SY 16/2STRCU OAS CMR/CL3R GY

SY 16/2 STR CU OAS CMR/CL3R GY is a low-voltage security/control cable specification commonly used in alarm, access control, and building systems.

🔧 What it is

• SY = Security / signal cable series (general designation varies by manufacturer)
• 16/2 = Two conductors of 16 AWG copper wire
• STR CU = Stranded copper conductors (more flexible than solid)
• OAS = Overall aluminum shield (foil shielding for noise protection)
• CMR / CL3R = Communications Riser rated / Class 3R fire rating
• GY = Gray jacket

⚙️ What it does

This cable is used to:

• Carry low-voltage control or signal power
• Reduce interference thanks to the foil shielding
• Meet fire code requirements for vertical riser runs

🧱 Typical applications

• Burglar/security alarm systems
• Access control (door strikes, readers)
• Intercom systems
• HVAC controls (thermostats, sensors)
• Building automation and signaling circuits

🛠️ Key characteristics

• 2 conductors (16 AWG) for power/signal pairs
• Stranded copper = flexible for pulling through conduit
• Foil shield (OAS) reduces electrical noise/EMI
• CMR/CL3R rating = approved for riser installation between floors
• Gray jacket = standard for low-voltage systems

🧠 Simple explanation

It’s basically a shielded 2-wire low-voltage cable used to connect alarms, controls, and building systems safely inside walls and risers.