Electric Service Requirements (ESR)
Standards for materials and construction.
The Electric Service Requirements book distributed by UniSource Energy Services is a reference and a guide for regulations and practices regarding the connection and supply of electric service.
The standards for Santa Cruz County are shared between Tucson Electric Power and UniSource. The most current ESR standards for Southern Arizona are available on tep.com as well as some helpful videos for some of the most common installation and construction processes.
View the standards for Mohave County.