Commercial Security Camera System Design Guide: From Planning to Installation

Designing a commercial security camera system requires balancing coverage, image quality, storage capacity, and network bandwidth. Whether you're securing a single office or a multi-site campus, the right planning ensures your investment delivers meaningful protection.

## Camera Types and When to Use Each

Different environments call for different camera types:

### Dome Cameras Best for indoor retail, offices, and lobbies. Vandal-resistant housings discourage tampering. Wide-angle lenses cover large areas with fewer cameras.

### Bullet Cameras Ideal for outdoor perimeters, parking lots, and building entrances. Longer focal lengths provide detail at distance. Weather-rated housings handle rain, sun, and temperature extremes.

### PTZ (Pan-Tilt-Zoom) Cameras Suited for large open areas like warehouses, campuses, and parking structures. Operators can track subjects in real time. Auto-tracking features follow motion without manual control.

### Multi-Sensor Cameras Single-mount cameras with multiple lenses covering 180° or 360°. Replace 3-4 fixed cameras with one unit, reducing infrastructure costs.

## Placement Strategy

Camera placement makes or breaks your system:

### Height and Angle Guidelines

Mount cameras at 8-12 feet for optimal facial capture. Avoid backlighting by not pointing cameras directly at windows or bright light sources. Angle cameras 15-30° downward to capture faces rather than the tops of heads.

## Storage Calculations

Camera storage depends on resolution, frame rate, and retention period:

| Resolution | Frame Rate | Storage per Camera per Day | |-----------|-----------|---------------------------| | 1080p | 15 fps | ~20 GB | | 4MP | 15 fps | ~35 GB | | 4K (8MP) | 15 fps | ~60 GB |

For a 16-camera 4MP system at 15 fps with 30-day retention: - Continuous: 16 × 35 GB × 30 = 16.8 TB - Motion-based: ~5-6 TB (typical business activity)

## Network Requirements

IP cameras need reliable network infrastructure:

• **Bandwidth:** Each 4MP camera at 15 fps requires 4-8 Mbps
• **PoE switches:** Use 802.3af/at PoE+ switches to power cameras over Ethernet
• **Dedicated VLAN:** Isolate camera traffic from business data
• **Cable runs:** Cat6 or Cat6A for runs up to 100 meters; use fiber for longer distances
• **Network recording:** NVR appliances or server-based VMS for centralized storage

## Common Design Mistakes

Summit DNC designs and installs commercial security camera systems across Southern California. We handle site surveys, camera selection, network infrastructure, and ongoing monitoring — delivering systems that actually protect your business.