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Extra Low Voltage System

Enjinia Consultants > Extra Low Voltage System

Extra Low Voltage System

ELV (Extra Low Voltage) systems are a major part of MEP engineering, covering all low-voltage communication, safety, and automation systems in a building. ELV typically operates below 50V AC or 120V DC and supports building intelligence, security, and IT infrastructure.

What is ELV in MEP?

ELV includes systems like:

  • Structured cabling (LAN & Data)
  • CCTV surveillance
  • Access control
  • Fire alarm system
  • Public Address (PA) system
  • Building Management System (BMS)
  • Intrusion detection
  • SMATV/IPTV
  • Intercom system

Major ELV Systems Explained

1. Structured Cabling System (SCS)

Purpose: Data & voice communication network.
Standards:
  • Telecommunications Industry Association (TIA)
  • International Organization for Standardization (ISO)
Design Includes:
  • Server room layout
  • Rack sizing
  • Patch panels
  • Cable tray routing
  • Fiber backbone
  • Cat6 / Cat6A planning

2. CCTV Surveillance System

Purpose: Security monitoring
Components:
  • IP Cameras
  • NVR
  • POE switches
  • Storage calculation (days retention)
Standards:
  • National Fire Protection Association (for integration in fire system)
  • Bureau of Indian Standards
Design Considerations:
  • Camera coverage angle
  • Lux level requirement
  • Storage calculation
  • Network bandwidth

3. Access Control System

Purpose: Controlled entry
Includes:
  • Card readers
  • Magnetic locks
  • Biometric systems
  • Control panels
Used in:
  • IT parks
  • Commercial buildings
  • Data centers

4. Fire Alarm System (ELV + Life Safety)

Types:
  • Conventional
  • Addressable
Standards:
  • National Fire Protection Association (NFPA 72)
  • National Building Code of India (NBC)
Design Includes:
  • Detector spacing
  • Loop calculation
  • Battery backup sizing
  • Control panel selection

5. Public Address (PA) System

Purpose
  • Emergency announcements
  • Background music
Integrated with:
  • Fire alarm system
  • BMS

6. Building Management System (BMS)

Purpose
Central monitoring of:
  • HVAC
  • Electrical
  • Fire
  • Plumbing pumps
Protocols:
  • BACnet
  • Modbus

️ELV Design Process in MEP

Step 1 – Requirement Study

  • Client requirement
  • Building type
  • Security level

Step 2 – Load & Device Calculation

  • Camera quantity
  • Detector count
  • Data points

Step 3 – Network & Power Planning

  • Cable sizing
  • Rack space planning
  • UPS backup

Step 4 – Drawing Preparation

  • ELV layout plans
  • Riser diagrams
  • SLD
  • Equipment room layout
Software Used:
  • AutoCAD
  • Revit MEP
  • Dialux (for lighting integration)
  • CCTV design software

ELV Deliverables in MEP

  • Design basis report
  • BOQ
  • Cable schedule
  • Device schedule
  • System schematic diagram
  • As-built drawings

Projects Where ELV is Critical

  • High-rise buildings
  • Hospitals
  • Airports
  • Industrial plants
  • IT parks
  • Hotels