--- title: "CS 25.1701 – CS 25.1731: SUBPART H – ELECTRICAL WIRING INTERCONNECTION SYSTEMS (CS-25) — rule index · Avioverse" description: "CS 25.1701 – CS 25.1731, CS-25. (See AMC 25.1701) (a) Electrical wiring interconnection system (EWIS) means any wire, wiring device, or combination of…" url: "https://avioverse.aero/regulations/easa/cs-25/subpart-h" --- # SUBPART H – ELECTRICAL WIRING INTERCONNECTION SYSTEMS Large Aeroplanes (CS-25) · CS-25 · CS 25.1701 – CS 25.1731 On this page 1. ## [AMC 25 Subpart H Correlation with previous amendment of CS-25](https://avioverse.aero/regulations/easa/cs-25/subpart-h/amc-25-subpart-h-correlation-with-previous-amendment-of-cs-25) The following table provides correlation between CS-25 Subpart H and CS-25 amendment 4: 2. ## [CS 25.1701 Definition](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1701) (See AMC 25.1701) (a) Electrical wiring interconnection system (EWIS) means any wire, wiring device, or combination of these, including termination… [AMC 25.1701 Definition](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1701#amc-25-1701) 3. ## [CS 25.1703 Function and Installation; EWIS](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1703) (See AMC 25.1703) (a) Each EWIS component installed in any area of the aeroplane must: [AMC 25.1703 Function And Installation; EWIS](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1703#amc-25-1703) 4. ## [CS 25.1705 Systems and Functions; EWIS](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1705) EWIS associated with systems required for type certification or by operating rules must be considered an integral part of that system and must be… 5. ## [CS 25.1707 System Separation; EWIS](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1707) (See AMC 25.1707) (a) Each EWIS must be designed and installed with adequate physical separation from other EWIS and aeroplane systems so that an EWIS… [AMC 25.1707 System separation; EWIS](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1707#amc-25-1707) 6. ## [CS 25.1709 System Safety; EWIS](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1709) (See AMC 25.1709) EWIS must be designed and installed so that: [AMC 25.1709 System safety; EWIS](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1709#amc-25-1709) 7. ## [CS 25.1711 Component identification; EWIS](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1711) (See AMC 25.1711) (a) EWIS components must be labelled or otherwise identified using a consistent method that facilitates identification of the EWIS… [AMC 25.1711 Component identification; EWIS](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1711#amc-25-1711) 8. ## [CS 25.1713 Fire Protection; EWIS](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1713) (See AMC 25.1713) (a) All EWIS components must meet the applicable fire and smoke protection requirements of CS 25.831(c) and CS 25.863. [AMC 25.1713 Fire protection: EWIS](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1713#amc-25-1713) 9. ## [CS 25.1715 Electrical bonding and protection against static electricity; EWIS](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1715) (See AMC 25.1715) (a) EWIS components used for electrical bonding and protection against static electricity must meet the requirements of CS 25.899. [AMC 25.1715 Electrical bonding and protection against static electricity: EWIS](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1715#amc-25-1715) 10. ## [CS 25.1717 Circuit protective devices; EWIS](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1717) (See AMC 25.1717) EWIS components must be designed and installed so they are compatible with the circuit protection devices required by CS 25.1357, so… [AMC 25.1717 Circuit protective devices: EWIS](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1717#amc-25-1717) 11. ## [CS 25.1719 Accessibility Provisions; EWIS](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1719) (See AMC 25.1719) Means must be provided to allow for inspection of EWIS and the replacement of its components as necessary for continued airworthiness. [AMC 25.1719 Accessibility provisions: EWIS](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1719#amc-25-1719) 12. ## [CS 25.1721 Protection of EWIS](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1721) (See AMC 25.1721) (a) No cargo or baggage compartment may contain any EWIS whose damage or failure may affect safe operation, unless the EWIS is… [AMC 25.1721 Protection of EWIS](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1721#amc-25-1721) 13. ## [CS 25.1723 Flammable fluid protection; EWIS](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1723) (See AMC 25.1723) EWIS components must be considered to be a potential ignition source in each area where flammable fluid or vapours might escape by… [AMC 25.1723 Flammable fluid protection: EWIS](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1723#amc-25-1723) 14. ## [CS 25.1725 Powerplants; EWIS](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1725) EWIS associated with any powerplant must be designed and installed so that the failure of an EWIS component will not prevent the continued safe operation… 15. ## [CS 25.1727 Flammable Fluid Shutoff Means; EWIS](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1727) EWIS associated with each flammable fluid shutoff means and control must be fireproof or must be located and protected so that any fire in a fire zone… 16. ## [CS 25.1729 Instructions for Continued Airworthiness; EWIS](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1729) The applicant must prepare Instructions for Continued Airworthiness applicable to EWIS in accordance with the requirements of CS 25.1529 and Appendix H… 17. ## [CS 25.1731 Powerplant and APU fire detector system; EWIS](https://avioverse.aero/regulations/easa/cs-25/subpart-h/cs-25-1731) EWIS that are part of each fire or overheat detector system in a fire zone must be at least fire-resistant. Consolidated from the EASA Easy Access Rules (revision 26 Jan 2023, extracted 13 Oct 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use. Share [LinkedIn](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Favioverse.aero%2Fregulations%2Feasa%2Fcs-25%2Fsubpart-h)[X](https://twitter.com/intent/tweet?url=https%3A%2F%2Favioverse.aero%2Fregulations%2Feasa%2Fcs-25%2Fsubpart-h\&text=SUBPART%20H%20%E2%80%93%20ELECTRICAL%20WIRING%20INTERCONNECTION%20SYSTEMS%20%E2%80%94%20CS-25)