| APU | Auxiliary Power Unit |
| BATT | Battery |
| BKR | Breaker Panel |
| Charger | Battery Charger |
| Converter | DC/DC Converter |
| F.C. | Frequency Converter |
| Inverter | DC to AC |
| Pwr Supp. | Power Supply |
| Rectifier | AC to DC |
| S/B | Switchboard |
| STS | Static Transfer Switch |
| S/W | Switch |
| TRU | Transformer Rectifier Unit |
| UPS | Uninterruptible Power System |
| XFMR | Distribution Transformer |
