T2 Part 13 / 3 phase Distribution and Socket

Question 1

What is the standard Phase voltage in Ireland?

Answer 1

230

Question 2

A Large warehouse having a 3 phase 4 wire supply derives its 230v supply from?

Answer 2

Any Phase and Neutral

Question 3

A Large warehouse having a 3 phase 4 wire supply derives its 400v supply from?

Answer 3

Any two phases

Question 4

Why do we provide a neutral on a 3 phase 4 wire system?

Answer 4

To provide for single phase supplies

Question 5

If we have a line voltage of 600v, what is the phase voltage ?

Answer 5

346v

Question 6

The insulation colour of the first phase in a 3 phase 4 wire system is ?

Answer 6

Brown

Question 7

The insulation colour of the second phase in a 3 phase 4 wire system is ?

Answer 7

Black

Question 8

Why do we divide the load to balance it on a 3 phase system?

Answer 8

To reduce the current on the neutral

Question 9

A type C MCB will trip magnetically between ______and_______ times its rated
current?

Answer 9

5 and 10

Question 10

A IS/EN 60309 socket outlet rate for 400v is coloured?

Answer 10

Red

Question 11

A IS/EN 60309 socket outlet rate for 110v is coloured?

Answer 11

Yellow

Question 12

A IS/EN 60309 socket outlet rate for 230v is coloured?

Answer 12

Blue

Question 13

An industrial socket outlet rated greater than 16 Amps shall be supplied by?

Answer 13

A separate circuit

Question 14

Which of the following is the abbreviation used to indicate the current rating of a circuit protective device?

Answer 14

In

Question 15

Which of the following is the abbreviation used to indicate the design current rating of a circuit?

Answer 15

lb