CCTV Installation and Maintenance Flashcards

When mounting a dome camera on a suspended ceiling, which hardware is most appropriate?

Answer: Pendant mount with ceiling adapter

A pendant mount with ceiling adapter provides the structural support and proper angle adjustment needed for suspended ceiling installations.

What does the term 'IP66' rating indicate on a CCTV camera enclosure?

Answer: The enclosure is dust-tight and protected against powerful water jets

IP66 means the enclosure is completely dust-tight (6) and protected against powerful water jets from any direction (6).

A technician notices video signal degradation over a long coaxial cable run. Which device should be installed to correct this?

Answer: In-line video amplifier

An in-line video amplifier boosts the signal strength to compensate for attenuation over long coaxial cable runs.

What is the recommended minimum overlap percentage when planning multiple camera fields of view for complete coverage?

Answer: 20%

A 20% overlap between adjacent camera views ensures there are no blind spots and provides redundancy at coverage boundaries.

Which cable type is preferred for PTZ camera control signals over long distances?

Answer: RS-485 twisted pair

RS-485 twisted pair cable is the standard for PTZ control signals because it supports long-distance, noise-resistant differential signaling.

During a CCTV system walkthrough, a customer reports that nighttime footage appears very grainy. What is the most likely cause?

Answer: Insufficient IR illumination range

Grainy nighttime footage typically indicates the camera's built-in IR LEDs do not reach the required distance, leaving the scene underexposed.

What is the purpose of using conduit when running CCTV cabling through a commercial building?

Answer: To protect cables from physical damage and provide a clean installation

Conduit protects cables from physical damage, rodents, and moisture while also providing a professional, code-compliant installation.