Electrical Awareness

Question 1

What is the ‘safe approach distance’ for ditribution and transmission powerlines?

Answer 1

Distribution = 8 m
Transmission = 20 m

Question 2

Explain touch potential & step potential?

Answer 2

General
- When an energised wire comes into contact with the ground, it energises the ground surrounding it.
- This creates a ripple effect from the
point of contact outwards.

Step Potential
- When feet are placed on different voltage rings, electricity equal to the difference between the rings will flow through the body.

Touch Potential
- When touching a wire or energised object while standing with feet on the same voltage ring, voltage equal to the difference between the wire and the voltage ring will flow through the body.

Question 3

What are the limitations of a Modiewark?

Answer 3

• Confirms presence of voltage but CANNOT confirm absence of voltage

DOES NOT Detect
* DC
* AC wiring that is shielded
* Step potential

Question 4

What is a Modiewark?

Answer 4

A non-contact AC voltage detector that assists in identifying electrical hazards at incidents.