Born with a heart of steel

For the purpose of these Requirements the following abbreviations of electrical terms have been used.
R-red phase
Y  - yellow phase
   B  - blue phase
   ac  - alternating current
   dc  - direct current
   A  - amp
   mA  - milliamp
   V  - volt
   kW  - kilowatt
   kVA  - kilovolt amp
   kWh  - kilowatt hour
   MVA  - megavolt amp

   Hz  - hertz (cycles per second)
   SP  - single pole
   SP&N - single pole and neutral
   DP  - double pole
   TP  - triple pole
   TP&N - triple pole and neutral
   SP&SwN - single pole and switched neutral
   TP&SwN - triple pole and switched neutral
   MCB  - miniature circuit breaker
   MCCB - moulded case circuit breaker
   ELCB  - earth leakage circuit breaker
   RCD  - residual current device
   MCC  - motor control centre
   PFC  - power factor correction
   PF  - power factor
   CP  - control panel
   UPS  - uninteruptible power supply
   PLC  - programmable logic controller
   MMI  - man machine interface
   PC   - personal computer
 I/O - input / output
 SPD - surge protection device
 LED - light emitting diode