Fill in the blanks with the appropriate answers.

Q. Where a building exceeds _______ stories, or ____ ft or more in height, overhead lines shall be arranged, where practicable to, so that a clear space (or zone) at least 6 ft wide will be left either adjacent to the buildings, or beginning not over 8 ft from them to facilitate the raising of ladders when necessary for fire fighting. Note: This relates to conductors operating at 600V or less nominal.

A. 5 / 75

B. 10 / 100

C. 1 / 20

D. 3 / 50

Answer: D

The proper clearance zone for fire ladders can be found in 225.19(E) of the 2011 NEC. This rule is in place to allow fire fighters a safe clear space to install and raise their ladders during fire fighting activities.

Owen is the owner and president of National Code Seminars and the holder of master electrician certifications in 46 states. He can be reached at necexpert@aol.com.