What Is the Standard Height of Power Lines?

By Marissa Poulson
To keep people safe, states employ standards to regulate the height of power lines.

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The height of power lines are determined by the amount of voltage they carry and the type of traffic in the area. For example, areas with only foot traffic can get by with a shorter, standard height over areas where semi-tractor trailer trucks frequently travel.

Identification

The National Fire Protection Association provides written standards referred to as the National Electric Code, which is reprinted every three years. Article 225, Section 18 of the National Electric Code outlines height standards for power lines.

Standards

The minimum height around residential properties for power lines with less than 300 volts is 12 feet. Power lines with a voltage above 300 volts require a minimum height of 15 feet. Public and commercial areas, especially those that feature over-size truck traffic, need greater clearance for safety's sake and the National Fire Protection Association suggests a height of at least 18 feet.

Regulation

The National Electric Code is not national law. Each state or city can adopt and implement their own standards if they choose. However, as the height of power lines is a safety issue more than anything, states can adopt parts of the code and amend other parts as they see fit.

About the Author

Marissa Poulson has been a freelance journalist since 2009. Her arts and entertainment reviews can be found in The Examiner. Poulson holds a Bachelor of Arts in creative writing from Arizona State University.

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