Construction Site Electrical Distribution Box Drawing Number
Electrical distribution boxes on construction drawings are assigned a unique Electrical Identification Number, which is used for referencing in schematics, panel schedules, and site drawings.
Electrical Identification Numbering
Each switchboard, low-voltage (LV) or high-voltage (HV) distribution box, and motor control center (MCC) is allocated a unique Electrical Identification Number. This number is used consistently across all construction documents, including:
- Schematic diagrams
- One-line diagrams
- Panel schedules
- Interconnection drawings For example, a main LV switchboard might be labeled as MAIN 440V L.V. SWITCHBOARD – (P410) REF: M1, where M1 is the Electrical Identification Number used throughout the project documentation .
Circuit and Panel References
Each circuit connected to the distribution box is assigned a PC (Power Circuit) reference number, which is prefixed by the Electrical Identification Number of the equipment. This ensures that every circuit can be traced back to its source distribution box. The numbering typically:
- Starts at the incoming feeders
- Ascends sequentially through bus sections, transformer feeders, and plant circuits
- Is shown on both the schematic diagram and the top of the interconnection diagram for clarity
Drawing Number Assignment
The drawing number for a distribution box is usually linked to the Electrical Identification Number and the sheet number in the construction drawing set. Standard practices include:
- Using a master tag list to assign numbers to all electrical equipment
- Ensuring the drawing number corresponds to the equipment's location and type
- Including the drawing number in the title block and schematic references for easy cross-referencing
Best Practices
- Maintain a consistent numbering scheme across all drawings to avoid confusion
- Include legends and abbreviations on the electrical drawing sheets to clarify symbols and references
- Separate different electrical systems (power, lighting, voice/data, fire alarm) on different plans if combining them reduces clarity
- Update the master tag list whenever new equipment is added or modified By following these practices, the drawing number and identification system ensures that all electrical distribution boxes are clearly referenced, traceable, and coordinated across the construction site documentation.
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