The ___________ is measured from the highest rung at full elevation & extension to the ground.

• A. Working height
• B. Safe reach
• C. Aerial height
• D. Maximum extension

Answer: (A)

Working height is the vertical distance from the ground up to the highest point you can reach from the elevating device when it is fully extended. This definition fits the description because it specifies the highest rung or platform at full elevation and extension and measures down to the ground, representing the actual usable height for performing work. Safe reach describes how far you can reach while staying in a stable position, not the device’s maximum workable height. Aerial height isn’t a standard term in this context, and maximum extension refers to how far the equipment can extend, not the height of the work point above ground.