Now I know that B.S. 7671 does not cover equipment aboard ships covered by other BS numbers, BUT a lot can be learned by the thoroughness of inspection and testing shown in this video, and the marvellous selection of spares carried and safely stored..................
https://www.bing.com/videos/search?q=youtube+electrical+surveys&docid=608006153835842475&mid=22537AD49C63CD29EFBE22537AD49C63CD29EFBE&view=detail&FORM=VIRE
Z.