| Section 601-01: Fundamental concepts |
| 601-01-01 | electric power system | |
| 601-01-02 | electric power network | |
| 601-01-03 | alternating current system | |
| 601-01-04 | direct current system | |
| 601-01-05 | power frequency | |
| 601-01-06 | generation of electricity | |
| 601-01-07 | conversion of electricity | |
| 601-01-08 | transformation of electricity | |
| 601-01-09 | transmission of electricity | |
| 601-01-10 | distribution of electricity | |
| 601-01-11 | interconnection (of power systems) | |
| 601-01-12 | interconnected systems | |
| 601-01-13 | asynchronous link | |
| 601-01-14 | short-circuit power | |
| 601-01-15 | load in a system | |
| 601-01-16 | peak load | |
| 601-01-17 | load curve | |
| 601-01-18 | load duration curve | |
| 601-01-19 | active energy | |
| 601-01-20 | reactive energy | |
| 601-01-21 | nominal voltage of a system | |
| 601-01-22 | operating voltage (in a system) | |
| 601-01-23 | highest voltage of a system | |
| 601-01-24 | lowest voltage of a system | |
| 601-01-25 | voltage level | |
| 601-01-26 | low voltage (abbreviation: LV) | |
| 601-01-27 | high voltage (abbreviation: HV) | |
| 601-01-28 | medium voltage (abbreviation: MV) (not used in the UK in this sense, nor in Australia) | |
| 601-01-29 | phase to phase voltage | |
| 601-01-30 | phase to neutral voltage | |
| 601-01-31 | phase to earth voltage | |
| 601-01-32 | neutral point displacement voltage | |
| 601-01-33 | bulk power system | |
| Section 601-02: System configuration |
| 601-02-01 | system diagram | |
| 601-02-02 | system operational diagram | |
| 601-02-03 | three-phase system diagram | |
| 601-02-04 | single-line diagram | |
| 601-02-05 | system pattern | |
| 601-02-06 | system configuration | |
| 601-02-07 | link in a system | |
| 601-02-08 | feeder | |
| 601-02-09 | single feeder | |
| 601-02-10 | branch line | |
| 601-02-11 | tapped line | |
| 601-02-12 | supply service | |
| 601-02-13 | ring feeder | |
| 601-02-14 | mesh (of a system) | |
| 601-02-15 | radial system | |
| 601-02-16 | tree'd system | |
| 601-02-17 | meshed system | |
| 601-02-18 | single supply | |
| 601-02-19 | duplicate supply | |
| 601-02-20 | stand-by supply | |
| 601-02-21 | tapped (tee off) substation | |
| 601-02-22 | neutral point in a polyphase system | |
| 601-02-23 | neutral point connection | |
| 601-02-24 | isolated neutral system | |
| 601-02-25 | solidly earthed (neutral) system | |
| 601-02-26 | impedance earthed (neutral) system | |
| 601-02-27 | resonant earthed (neutral) system | |
| 601-02-28 | circuit (in electric power systems) | |
| 601-02-29 | line tap | |
| 601-02-30 | line section | |
| 601-02-31 | line segment | |
| 601-02-32 | interchange point | |
| 601-02-33 | delivery point | |
| Section 601-03: Equipment |
| 601-03-01 | power station | |
| 601-03-02 | substation (of a power system) | |
| 601-03-03 | electric line | |
| 601-03-04 | overhead line | |
| 601-03-05 | underground cable | |
| 601-03-06 | gas insulated line | |
| 601-03-07 | overhead system | |
| 601-03-08 | underground system | |
| 601-03-09 | phase | |
| 601-03-10 | neutral | |
| 601-03-11 | pole (of an equipment) | |
| 601-03-12 | pole (of a DC system) | |
| Section 601-04: High-voltage DC systems |
| 601-04-01 | high-voltage DC link | |
| 601-04-02 | monopolar DC link | |
| 601-04-03 | bipolar DC link | |