Cabling and Installation Tips for Security Cameras
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Camera installation
Mounting height within the coverage requirement: 2.5–4 m indoors, 3.5–10 m outdoors. In elevator cars, mount at the top diagonally opposite the operator, optical axis at 45° to both walls and ceiling.
After cabling, power the camera and check the image before fixing it in place.
In strong-power environments, insulate the camera from ground to avoid interference.
For non-IR cameras, avoid opening the lens during handling and installation.
Outdoor installations need lightning protection.
Mount on solid walls or structures to prevent image shake.
Adjust IR illuminators at night via the monitor.
Leave about 1 m of cable slack at the camera so rotation is not restricted.
IR cameras should avoid direct light sources — the IR LEDs are switched by a photoresistor on the board.
Avoid objects that absorb infrared (black surfaces, open space, water): reflected IR is what forms the image, and absorption weakens effective illumination.
Size the IR power supply above the illuminators' rated current (typically 2 A) for reliable night operation.
Keep fingers off the CCD target surface and lens; choose quality BNC connectors to avoid rework.
Cabling
Video: SYV 75-3 up to ~200 m; SYV 75-5 up to ~400 m; SYV 75-7 up to ~800 m. Coaxial cable (RG59U/RG6/RG11) must be 100% copper core with 95% copper braid shield; loop resistance must not exceed 15 Ω. Beyond 500 m, consider fibre.
Power: flame-retardant cable, thicker where possible to reduce voltage drop.
Control: shielded RVVP 2×1.0 cable.
Conduit: PVC conduit or trunking generally; buried or explosion-proof works require galvanised steel (JDG) conduit.
Control equipment
Console and cabinet positions must match the design: stable, easy to operate and maintain, with clearance at the rear and sides for servicing.
All cables in the control room should be laid per equipment positions, neatly arranged, numbered and permanently labelled.
Control equipment belongs in a clean, air-conditioned room, mounted on 19-inch racks with spacing and forced ventilation.
Wire the monitor room's live, neutral and earth lines to spec. Before powering monitors/DVRs/matrix/switches, measure the voltage between equipment chassis and the video cable shield with a multimeter — the higher the voltage, the greater the risk to camera video outputs. Never hot-plug video cables when the voltage is non-zero.
