Lighting Distribution Board (LDB) specs cover enclosure (IP rating, material), electrical ratings (voltage, fault current, busbar), protection (MCBs, fuses), safety (interlocks, shrouds), and standards (IEC, IS), ensuring safe power delivery for lights, with key elements like CRCA sheet steel enclosures, high-conductivity copper busbars, trip-free MCBs (Type C/D), shrouded terminals, IP ratings (IP54/65/66), and compliance with standards like IEC 61439-1/2.

• Enclosure & Construction:
• • Material: 2mm thick CRCA (Cold Rolled Close Annealed) sheet steel.
  • Protection: IP rating (e.g., IP54 for indoor, IP66 for outdoor), gasketted doors.
  • Doors: Hinged, lockable, with internal barriers (Bakelite/Acrylic) or fiberglass sheets for safe operation.
  • Cable Entry: Sufficient gland plate space with appropriate glands for cable entry.

• Electrical Ratings:
• • Voltage: 415V AC (3 Phase, 4 Wire) typical for lighting.
  • Frequency: 50 Hz.
  • Busbars: High-conductivity tinned copper, sized for load (e.g., 300 sq.mm.) with separate Earth/Neutral bars, high short-circuit withstand (e.g., 50kA for 1 sec).

• Protection Devices:
• • Main Incomers: MCCBs (Molded Case Circuit Breakers) or Isolators.
  • Outgoing Feeders: MCBs (Miniature Circuit Breakers) – Type C for general, Type D for high inrush (LEDs).
  • Fuse Protection: HRC fuses for specific circuits (e.g., solar strings).

• Safety & Features:
• • Interlocks: Main MCCB interlocked with door for safety.
  • Shrouded Terminals: To prevent accidental contact.
  • Labeling: Numbered, clearly marked terminals/MCBs.
  • Monitoring: Provision for meters, indicators, SCADA interface.

• Standards & Testing:
• • Compliance: IEC 61439-1 & 2, IS:8623, IS:13032.
  • Type Tested: For performance under fault conditions and extreme temps.