Fall at Skagit Hydroelectric Project, Photo by Kevin Lidtka
Seattle City Light LARRY WEIS, General Manager and CEO
Electric Service
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Requirements for Electrical Service Connection

Below we have provided the general requirements for residential, commercial and industrial customers to obtain new or improved electrical service from Seattle City Light.

Every chapter has information you may find useful, however, residential customers and contractors will find much of their needed basic information provided in Chapters 1,3,5, 6 and 11.

Commercial builders will find every chapter has useful information. For commercial builders in our Network areas, Chapter 8 will be especially helpful.

Before you get started in your project, please review the following helpful tips.
  • Building and working clearances required from power lines can be found here.
  • For residential customers upgrading or enlarging their electric service, the existing location may not be an acceptable location. Please consult with your electric service representative before initiating the change.
  • If you are installing an underground service, the number of bends is an important element. SCL minimum conduit size is 3” for most residential services, large sweep rigid steel bends are required and we have material standards listing acceptable conduit manufacturers. If you are coming off a pole, SCL will specify what side (face) of the pole you must install your conduit on, and we will also need to verify the pole is acceptable for the installation. Contact your electric service representative for information.
  • Seattle City Light has a “single-service” requirement (see Chapter 5), so if you are adding an ADU or short-platting to a unit-lot, SCL must approve the termination point of the service.
  • For commercial jobs requiring a primary service (see table 5-1 in Chapter 5) or if you require additional distribution for an extensive multi-lot development, 18 months minimum may be necessary for engineering and material acquisition before your project can be energized.
  • If you are looking for information on new technologies, such as solar generation, or electric vehicle charging, please visit the following web pages:
The best tip is to submit your complete application and plans as soon as possible!

Table of Contents

CHAPTER 1: Getting Started: Initial Requirements for Electric Service

CHAPTER 2: Easements

CHAPTER 3: Clearance Requirements

CHAPTER 4: Temporary Services

CHAPTER 5: Types of Service

CHAPTER 6: Equipment for Service Installation

CHAPTER 7: Primary Services in Non-Network Areas

CHAPTER 8: Primary & Secondary Services in Network Areas Updated 12/12/2012

CHAPTER 9: Primary Underground: Transformer Pad Construction

CHAPTER 10: Maintenance of Conductors & Division of Responsibility

CHAPTER 11: Metering

CHAPTER 12: Motors & Special Loads

CHAPTER 13: Technical and Special Requirements

CHAPTER 14: Customer Generation New 9/28/2015


Commonly Referenced Diagrams

(Note: For reference only. Consult with your Electrical Service Representative before installing any equipment.)
Related Content
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Small/Medium Projects North of Denny Way
1300 North 97th Street
Residential & Commercial
(206) 615-0600
fax: (206) 684-4299

Small/Medium Projects South of Denny Way
3613 4th Avenue South
(206) 386-4200
fax: (206) 386-4222

Large Commercial and Industrial Projects
1 MW demand and greater, Seattle Municipal Tower
700 Fifth Avenue
(206) 684-3186
fax: (206) 287-5231

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    700 5th Avenue
    Suite 3200
    P.O. Box 34023
    Seattle, WA 98124-4023

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