Change over switches

Question 1

What are the two types of supplies?

Answer 1

• Normal
• Alternative

Question 2

What are the THREE categories of changeover switch?

Answer 2

• Automatic Change-Over Switch (ACOS)
• Remote Operated Change-Over Switch (ROCOS)
• Hand Change-Over Switch (HCOS)

Question 3

Why do we use ACOS?

Answer 3

• Works with normal and alternative supplies
• Automatic change to alternative supply if normal fails
• Provides power to HCOS

Question 4

Why do we use RCOS

Answer 4

• Operated by hand from a remote location
• Operating switch located in ship’s control centre

Question 5

What are the three types of HCOS?

Answer 5

• Normal/alternative
• Normal/emergency
• Normal/alternative/emergency