Text in force at CS25-28: from CS25-5, effective 5 Sep 2008.
electricity; EWIS (See AMC 25.1715)
(a) EWIS components used for electrical bonding and protection against static electricity must meet the requirements of CS 25.899.
(b) Electrical bonding provided by EWIS components must provide an adequate electrical return path under both normal and fault conditions, on aeroplanes having earthed electrical systems (see CS 25.1353(e)).
ED Decision 2008/006/R · Source