Section 7 Cables - Construction and testing

7.1.1 Cables are to be in accordance with an acceptable National or International Standard, due regard being given to the ambient conditions stated inPt 6, Ch 2, 1.5 Ambient temperatures.

7.2.1 Permitted insulating materials with maximum rated conductor temperatures are given in Table 2.2.1 Maximum operating conductor.

7.2.2 Where a rubber or rubber-like material with maximum conductor temperature greater than 60°C is used, it is to be readily identifiable.

7.2.3 Other insulating materials will be considered.

7.3.1 Cables are to be protected by one or more of the following, and the sheath or protective covering is to be compatible with the insulation:

1. Sheath

   	Lead-alloy sheath
   	Copper sheath
   	Non-metallic sheath

2. Protective covering

   	Steel-wire armour
   	Steel-tape armour
   	Metal-braid armour
   	(basket weave)
   	Fibrous braid.

7.3.2 Unsheathed cables, e.g. rubber-insulated taped and braided or equivalent, may be used only if installed in conduit.

7.3.3  Non-metallic sheath. Polychloroprene compound, polyvinyl chloride compound and chlorosulphonated polyethylene may be used for impervious sheaths. Other compounds will be considered.

7.3.4  Fibrous braid. Textile braid is to be of cotton, hemp, glass or other equivalent fibre, and is to be of strength suitable for the size of the cable. It is to be effectively impregnated with a compound which is resistant to moisture, and flame retarding except where flame-extending cables are permitted by Pt 6, Ch 2, 2.19 Choice of protective covering 2.19.2.

7.3.5 Cable outer sheath of cables are to be resistant to oil and oil vapour.

7.4.1 Tests in accordance with an acceptable National or International Standard are to be made at the manufacturer’s works prior to despatch.