CTSP Electrical Hazards and Utility Line Safety 5

Question 1

Which type of wood is generally considered the MOST dangerous to use near energized conductors because of its electrical conductivity?

Accepted Answer

Green (freshly cut) wood with high moisture content

Answer

Green wood has high moisture content, which dramatically increases its electrical conductivity and makes it far more dangerous to use near energized lines than dry wood.

Question 2

What is 'touch potential' and why is it relevant to tree workers after a tree contacts a power line?

Accepted Answer

The voltage difference between the ground and an energized object a worker touches simultaneously, creating a path for current flow

Answer

Touch potential is the voltage between a worker's hand touching an energized object (like a tree in contact with a line) and their feet on the ground, which drives current through the body.

Question 3

When a tree or large limb falls across a high-voltage transmission line, which action is PROHIBITED for the tree crew?

Accepted Answer

Attempting to remove the tree or limb using any equipment until the utility confirms the line is de-energized and grounded

Answer

No equipment operation or removal attempt is permitted until the utility has de-energized and grounded the line, regardless of whether the line appears intact.

Question 4

How does arc flash differ from direct contact electrocution as a hazard for tree workers near high-voltage lines?

Accepted Answer

Arc flash can injure or kill a worker without any physical contact with the conductor, through radiant heat and blast pressure

Answer

Arc flash releases tremendous energy — heat, UV radiation, pressure, and molten metal — that can severely injure or kill workers who are near but not touching the conductor.

Question 5

Which type of rope is PROHIBITED for use as a climbing line or rigging line when working near energized conductors?

Accepted Answer

Natural fiber rope (manila, sisal) or any rope that is wet or contaminated

Answer

Natural fiber ropes absorb moisture and become conductive; any wet or contaminated rope significantly reduces the insulating properties needed near energized lines.

CTSP - Certified Treecare Safety Professional Practice Test

CTSP - Certified Treecare Safety Professional Practice Test

CTSP Electrical Hazards and Utility Line Safety 5