Basic Electrical Awareness

Question 1

What are the Power-line approach distances

Answer 1

Distribution power lines - 8m
Transmission power lines (extra high voltage) - 20m

Question 2

Explain the ripple effect (electrical)

Answer 2

• when an energized wire comes into contact with the ground, it energizes the ground surrounding it
• This creates a ripple affect from the point of contact outwards
• Downed wires, create two problems, known as ‘step and touch potential’

Question 3

What is the step potential?

Answer 3

• When feet are placed on different voltage, rings, electricity equal to the difference between the rings will flow through the body

Question 4

Live power during firefighting

Answer 4

Continuously conduct a DRA
Attack around live power Is at the discretion of OIC
Live power treated as priority
Treat all power as live