Which of the following is an important safety rule to remember when using a crank-up tower?

Answer: C. This type of tower must not be climbed unless it is retracted, or mechanical safety locking devices have been installed

A crank-up tower must not be climbed unless it is retracted or mechanical safety locking devices have been installed. Otherwise a section could slide down and crush or injure the climber. Crank-up towers can be painted and should be grounded.

Tip: Crank it down before you climb.