P&D revision 2 Flashcards
What does C and C stand for
control and communications
Define converted supply
Converted supply has its voltage and/or frequency changed from 450v/60hz
What are the voltages used in the CandC switchboard
24 volts dc, 115v, 400Hz
What and where is earth testing facilities for 24v dc
Earth testing panel on switchboard for testing pos and neg side of DC supply. A push button with integral lamp is fitted to the switchboard.
What does TRU stand for
transformer rectifier unit
What does RTR stand for
Rationalised Transformer Rectifier
Batteries fall into 2 categories name them
Primary & Secondary
Characteristic of primary batteries
Not rechargeable, usually small, once used thrown away
Characteristics of secondary batteries
Wet batteries, rechargeable, specialist recharging equipment required, vary in size.
Battery capacity measured in
Amp-hour rate
Voltage of a fully charged cell
2.1v fully charged
What is the Voltage of a discharge cell
1.75v discharged
