1 General
  1.1 Scope
  1.2 Object
  1.3 Definitions
  1.4 Normative references
2 Low-voltage supply-characteristics
  2.1 Power frequency
  2.2 Magnitude of the supply voltage
  2.3 Supply voltage variations
  2.4 Rapid voltage changes
  2.5 Supply voltage dips
  2.6 Short interruptions of the supply voltage
  2.7 Long interruptions of the supply voltage
  2.8 Temporary power frequency overvoltages between live
       conductors and earth
  2.9 Transient overvoltages between live conductors and
       earth
  2.10 Supply voltage unbalance
  2.11 Harmonic voltage
  2.12 Interharmonic voltage
  2.13 Mains signalling voltage on the supply voltage
3 Medium-voltage supply-characteristics
  3.1 Power frequency
  3.2 Magnitude of the supply voltage
  3.3 Supply voltage changes
  3.4 Rapid voltage changes
  3.5 Supply voltage dips
  3.6 Short interruptions of the supply voltage
  3.7 Long interruptions of the supply voltage
  3.8 Temporary power frequency overvoltages between live
       conductors and earth
  3.9 Transient overvoltages between live conductors and earth
  3.10 Supply voltage unbalance
  3.11 Harmonic voltage
  3.12 Interharmonic voltage
  3.13 Mains signalling voltage on the supply voltage
Annex A (informative) Special nature of electricity