T0B07 : Which of the following is an important safety rule to remember when using a crank-up tower?
A
This type of tower must never be painted
B
This type of tower must never be grounded
C
This type of tower must not be climbed unless it is retracted, or mechanical safety locking devices have been installed
D
All these choices are correct
Correct Answer: This type of tower must not be climbed unless it is retracted, or mechanical safety locking devices have been installed