Here's a comprehensive overview of common ELV (Extra Low Voltage) systems, their components, and a
description of their schematic diagrams.
1. CCTV Surveillance System
Components:
- Cameras: Various types (fixed, PTZ, dome).
- Cabling: Coaxial (RG-59 or RG-6) or Ethernet (Cat 5e/Cat 6).
- DVR/NVR:Digital Video Recorder or Network Video Recorder for storing footage.
- Monitors: For live viewing and playback.
- Power Supply:For powering cameras.
Schematic Diagram Description:
- Layout: Cameras connected to DVR/NVR via coaxial or Ethernet cables.
- Power Supply: Power runs to each camera from a centralized source or PoE (Power over Ethernet)
switch.
- Monitoring Station: Monitors connected to the DVR/NVR output.
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2. Fire Alarm System
Components:
- Smoke Detectors: Ionization or photoelectric types.
- Heat Detectors:For detecting temperature rise.
- Control Panel: Central unit that processes signals.
- Alarm Devices: Sirens, strobe lights, or bells.
- Manual Pull Stations:For manual activation of alarms.
- Wiring: Typically uses multiconductor cables.
Schematic Diagram Description:
- Layout: Detectors connected to the control panel.
- Alarm Devices: Linked to the control panel to activate upon detector signal.
- Manual Stations: Interconnected to the control panel.
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3. Access Control System
Components:
- Access Control Panel:Central unit managing access.
- Card Readers: RFID or magnetic stripe readers.
- Electric Locks:For securing doors.
- Keypads:For PIN entry.
- Cabling:Typically uses multi-conductor cable.
Schematic Diagram Description:
- Layout: Readers and keypads connected to the access control panel.
- Locks: Electrically connected to the panel for activation.
- Power Supply:Centralized power source feeding the entire system.
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4. Public Address (PA) System
Components:
- Microphones: Wired or wireless for audio input.
- Amplifiers: Boost audio signals.
- Speakers: Installed in various locations.
- Mixer: For audio control (optional).
- Cabling: Speaker wire and audio cables.
Schematic Diagram Description:
- Layout: Microphones connect to the mixer (if used), then to amplifiers.
- Speakers: Wired in parallel to the amplifier outputs.
- Control Panel:** Optional for volume and zone control.
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5. Data Network System
Components:
- Network Switches: For connecting multiple devices.
- Routers: For internet connectivity.
- Patch Panels:For organizing network cables.
- Cabling: Ethernet cables (Cat 5e/Cat 6).
- Wireless Access Points: For Wi-Fi coverage.
Schematic Diagram Description:
- Layout: Routers connected to switches.
- Patch Panels:Linking cables from various rooms to the central switch.
- Devices: Computers and other devices connected to the switch.
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6. Home Automation System
Components:
- Smart Hub: Central controller for devices.
- Smart Lights:LED bulbs or fixtures.
- Sensors:Motion, temperature, and door/window sensors.
- Smart Switches:For controlling devices remotely.
- Cabling: Depending on the system (may use Wi-Fi or wired connections).
Schematic Diagram Description:
- Layout:Smart devices connected to the hub.
- Sensors: Interconnected to the hub, triggering actions like lighting.
- Control Interface:Smart phones or tablets connecting to the hub.
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Summary
Each ELV system has specific components tailored for its function, and the schematic diagrams illustrate
how these components interconnect. For actual diagrams, consider using software like AutoCAD.