2.2.1 Metal frames or enclosures of apparatus and electrical machinery may be fixed to, and in metallic contact with, the ship's structure, provided that the surfaces in contact are clean and free from rust, scale or paint when installed and are firmly bolted together.
|Type of earthing connection||Cross-sectional area of associated current|
|Minimum cross-sectional area of copper earthing connection|
conductor in flexible cable or flexible cord
|any||Same as current carrying conductor up to and including 16 mm2 and one half above 16 mm2 but at least 16 mm2|
|2||Earth-continuity conductor incorporated in fixed cable||any|
|Cross-section of main conductor|
|<= 2,5 mm2||Same as current carrying conductor subject to minimum of 1,5 mm2 for stranded earthing connection or 2,5 mm2 for unstranded earthing connection|
|> 2,5 mm2 but <= 120 mm2||One half the cross-sectional area of the current carrying conductor, subjected to a minimum of 4 mm2|
|> 120 mm2||70 mm2|
2.2.2 For metal frames or enclosures which are not earthed as specified in [2.2.1], earthing connections complying with [2.3] and [2.4] are to be used.
2.2.3 For requirements regarding the earthing of coverings of cables and the mechanical protection of cables, see [7.11] and [7.12].