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Sub-item of Panel Cabinet Wiring Quota

Sub-item of Panel Cabinet Wiring Quota

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Sub-items for panel or cabinet wiring quotas include conductor types, sizes, lengths, current ratings, and installation details, calculated according to NEC, UL 508A, and project BOQ standards.

Key Components of Wiring Quota

  1. Conductor Type and Material
    • Internal wiring must be copper for UL 508A compliance .
    • Control circuit wires typically use 18 AWG minimum, while main current wiring should not be less than 14 AWG .
  2. Current Carrying Capacity
    • For individual loads, wiring should support 125% of the full-load current.
    • For multiple loads, the wiring must accommodate 125% of the largest motor load plus the sum of all other full-load currents .
    • Conductor cross-section is selected using NEC Table 310.15(B) or UL 508A tables based on calculated current .
  3. Wiring Length and Quantity
    • Quantities are measured in meters or feet according to the project BOQ .
    • Each sub-item should specify the number of conductors, length, and unit price for accurate cost estimation .
  4. Panel and Cabinet Installation Requirements
    • Panels must comply with NEC 110.26 for working space and clearance: 30 inches wide, 36 inches deep, and 6.5 feet high in front of the panel .
    • Enclosed type components must maintain spacing requirements and not exceed marked electrical ratings .
  5. Marking and Identification
    • Each conductor should be labeled at connection points to match the circuit diagram .
    • Protective conductors are green or green-yellow, grounded AC conductors are white or gray, and ungrounded conductors are black .
  6. Sub-item Breakdown in BOQ
    • Each wiring sub-item should include:
      • Item number
      • Description (e.g., 14 AWG copper wire for motor feeder)
      • Unit (meter, piece, or LS)
      • Quantity (calculated from panel layout and wiring diagram)
      • Unit price and total price .

Practical Example

For a control panel with three motors:

  • Main feeder wire: 14 AWG copper, 10 meters, rated for 125% of largest motor load.
  • Control wiring: 18 AWG, 15 meters, labeled for PLC inputs/outputs.
  • Protective conductor: green, 12 meters, connecting all metal parts to ground. Each of these would be listed as a separate sub-item in the BOQ with quantity, unit, and cost.

Summary

A panel/cabinet wiring quota is a detailed breakdown of all wiring components, including conductor type, size, length, current rating, and installation requirements. It ensures compliance with NEC, UL 508A, and project specifications, facilitates accurate cost estimation, and provides clear guidance for installation and inspection .

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