Power lines are the biggest hazard to the operation of cranes or similar boomed equipment, a fact confirmed by a 10-year study solely about cranes. The American Concrete Pumping Association recommends always keeping boom pumps at least 17 feet from all power lines. If the site doesn't allow the prescribed distances from power lines, the general contractor must have the electric company de-energize, cover or relocate the lines. The safest measures are to de-energize or relocate the lines. Another option is erecting rider posts, which keep equipment from touching the power lines. Always assume any overhead power line is energized until the line owner or utility verifies that the line is de-energized. The article also lists 10 ways to prevent electrocution. KEYWORDS: power, line, boom, electrocution