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.)