EPC 31 - Safe Isolations & Tagging Procedures

Question 1

What is the major functional difference between a switch and a typical circuit breaker?

Answer 1

A circuit breaker is usually ON in the UP position; or a circuit breaker operates automatically.

Question 2

What are the main colours used on a danger tag marked ‘DANGER, DO NOT OPERATE’?

Answer 2

Red and black.

Question 3

What are the main colours used on a danger tag marked ‘OUT OF SERVICE’?

Answer 3

Yellow and Black.

Question 4

What MAIN precaution must be taken before touching the terminals of any fixed 230V/400V device?

Answer 4

Test for zero volts.

Question 5

What additional precaution must be taken before touching the terminals of a fixed 230V/400V device AFTER you have tested the terminals for 0V?

Answer 5

Test the testing device.

Question 6

Who should remove a danger tag from an electrical isolator under normal working conditions?

Answer 6

The person who placed it there.

Question 7

Re-arrange the following actions in the correct sequence for a typical correct isolation procedure:

Tag | Test | Isolate | Switch-off | Identify

Answer 7

1. Identify.
2. Switch off.
3. Isolate.
4. Tag.
5. Test.