Diagram Services – One Line

A single-line diagram will clearly show how the main components of the electrical system are connected, including available spare capacity. It shows your present power distribution path from the incoming power source to each downstream load – including the ratings and sizes of each piece of electrical equipment, their circuit conductors, and their protective devices

An up-to-date single-line diagram is essential for a variety of service activities including:

  • Short circuit calculations
  • Coordination studies
  • Load flow studies
  • Safety evaluation studies
  • Electrical safety procedures
  • Efficient maintenance

Scope
To give you an accurate picture of your electrical system, single-line diagram information includes:

  • Incoming lines (voltage and size —capacity and rating)
  • Incoming main switches and main and tie breakers
  • Power transformers (rating, winding connection and grounding means)
  • Feeder breakers and fused switches
  • All main cable and wire runs with their associated isolating switches (size and length of run)
  • Critical equipment voltage and size (UPS, battery, generator, power distribution, transfer switch, computer room air conditioning)
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