The supercapacitors covered by this Guide are also referred as Electric Double-Layer Capacitors (EDLC)@ Electrochemical Capacitors@ or Ultracapacitors. For requirements applicable to conventional electrolytic capacitors used for harmonic filtering@ please refer to the requirements in 4-8-2/9.23 of the Steel Vessel Rules. This Guide addresses the requirements related to supercapacitors installed onboard marine and offshore assets classed by ABS that meet the requirements in Subsection 1/3 of this Guide. Capacitor-type energy storage technology is a field that is continuously evolving with respect to materials and design. Alternative capacitor-type energy storage technologies and arrangements may be considered provided it can be shown@ through either satisfactory service experience or a systematic analysis based upon sound engineering principles@ to meet the overall safety requirements of this Guide and the ABS Rules.