Skip to main content

One-line Display Standards

PPL Electric Utilities requires the following included in the customer one-line drawing, where applicable:

  1. Lightning Arrestors (LA's)
  2. Primary equipment on the Transformer (example: CB's, disconnects, circuit switches)
  3. Potential Transformers (PT's) and Current Transformers (CT’s)
  4. Customer Transformer data (kVA for 12kV Rating or MVA for 69kV, Delta-Wye or Wye Delta transformer winding configuration)
  5. Customer Secondary equipment on the Transformer (example: CB's, Disconnects)
  6. If applicable: the TIE between two sections, Customer Secondary Bus (TIE CB, and disconnects)
  7. Customer Emergency Generation and/or Distributed Generation/Renewable
  8. If applicable: tie on PPL EU’s 12kV Distribution System or PPL EU’s 69kV Transmission System (Alternate Supply).
  9. What the customer designations are for all the devices as mentioned above. (Example Trans 1, Tap 1 AB, 52-4 CB, Sect 1 Bus etc.)
  10. If there are any key interlocks with CBs or air breaks.
PPL Electric Utilities, May 14, 2024