General

Question 1

Which MCCs have ABTs?

Answer 1

F1B08, F1C08, F1D08, F2A08, F2B11, and F2C11

Question 2

What is the emergency power supply for all of the Diesel Backed MCCs?

Answer 2

XF-1-A

Question 3

Where does XF-1-A get it’s power from?

Answer 3

EH12…..XH12…..XHF-1-A…..XF-1-A

Question 4

What are the conditions for an ABT transfer?

Answer 4

1) MCC bus voltage less than 85% of rated.
2) Alternate power supply voltage AND frequency greater than 90%.
3) NO lockout on MCC bus.

Question 5

Are the ABTs normal or power seeking?

Answer 5

F1B08, F1C08, and F1D08 have NORMAL SEEKING ABTs.

F2A08, F2B11, and F2C11 have POWER SEEKING ABTs, because they require manual transfer to the normal source.

Question 6

Are the ABTs “Break before Make” or “Make before Break”?

Answer 6

Make before break

Question 7

When power is restored to the normal source for F1B08, F1C08, and F1D08 will the ABT immediately shift back?

Answer 7

There is a 30 minute time delay to shift back to the normal source after power has been restored.

Question 8

Which load centers can be cross-tied?

Answer 8

1) F1A and F1B
2) F1C and F1D
3) F1E and F1F
4) F1G and F2G
5) EF1A and EF1B
6) EF1C and EF1D

Question 9

What are the conditions of a breaker that is RACKED IN?

Answer 9

1) Load stabs connected
2) Aux stabs connected
3) Control Power available
4) Line Power available
5) Protective relaying available
6) Operation: Local and Remote as applicable
7) Indications: Local and Remote as applicable

Question 10

What are the conditions of a breaker that is RACKED to TEST?

Answer 10

1) Load Stabs are not connected
2) Aux Stabs are connected
3) Control Power is available
4) Line Power is unavailable
5) Protective relaying is unavailable
6) Operation: Local only
7) Indication: Local-yes, Remote-generally no

Question 11

What is the condition of a breaker that is RACKED to DISCONNECT?

Answer 11

1) Load Stabs are not connected
2) Aux Stabs are not connected
3) Control Power is unavailable
4) Line Power is unavailable
5) Protective relaying is unavailable
6) No operation in this configuration
7) No indication in this configuration

Question 12

What is the condition of a breaker that is REMOVED?

Answer 12

1) Load Stabs are not connected
2) Aux Stabs are not connected
3) Control Power is unavailable
4) Line Power is unavailable
5) Protective relaying is unavailable
6) No operation in this configuration
7) No indication in this configuration