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Chapter 4

Primary line extensions

If your new residence is not located close to existing primary electrical facilities, a
primary line extension is required to place a transformer close to your structure.
Primary line extensions are typically underground facilities.

Customer responsibility

PSE’s Electric Tariff G, Schedule 85 requires customers to provide the trenching,
excavation for vaults and backfill in accordance with PSE standards and work
sketch, or contract with PSE to provide this work at its estimated cost.
If you require a primary line extension, submit Electric Service Application
Single-Family Residential 100E. All forms can be downloaded at
pse.com/customerconstruction.

Inspection/Coordination

PSE shall assign a Project Manager to oversee the trenching, equipment placement/
installation, and backfilling.
• Work shall be subject to the inspection and satisfaction of PSE.
• No work shall be backfilled, covered, or concealed until it has been inspected
and approved by the inspector.

Site preparation

The following site requirements must be met before the installation can begin.
• The trench route shall be clear of spoils, construction materials, and any other
obstacles.
• The site shall be at final grade or acceptable subgrade in the area of
construction.
• The front property line shall be surveyed and staked.

Electric Service Handbook 2017 — Single-Family Residential Projects 37