P+D Flashcards
1
Q
What does MCCB mean?
A
Moulded Case Circuit Breaker.
2
Q
Do breakers and fuses protect the item being operated?
A
No.
3
Q
Which breaker will trip first?
A
The one nearest the fault.
4
Q
Which breaker will trip last?
A
The one furthest from the fault.
5
Q
What is 440v discrimination ratio?
A
3:1.
6
Q
What is 115v discrimination ratio?
A
2:1.
7
Q
What does PCP mean?
A
Primary control position. (The bridge)
8
Q
What does SCP mean?
A
Secondary control position. (Inside machine space)
9
Q
What does PCP control/operate?
A
- All main breakers.
- All generator voltages.
- All generator frequencies.
- Anti-condensation heater in switchboard.
10
Q
What does PCP show?
A
- Plan of whole electrical distribution system up to the EDC.
- State of all breakers + generators.
11
Q
What does SCP control/operate?
A
- Breakers controlled by section switchboard.
- Voltages of generators controlled by section switchboard.
- Frequency of generators controlled by section switchboard.
- Anti-condensation heaters in switchboard.
12
Q
What does SCP show?
A
- Plan of electrical distribution system fed from the section.
- State of all breakers + generators controlled by the section.
13
Q
What does EDC mean?
A
Electrical distribution centre.
14
Q
What are the 6 switchboard indicator lights?
A
- Control available/not available.
- Generator running.
- Fire detected.
- Over temperature.
- Breaker tripped discrepancy switch illuminates.
- light indication + audible alarm.
