IEC TR 60092-370 pdf download Electrical installations in ships – Part 370: Guidance on the selection of cables for telecommunication and data transfer including radio-frequency cables
5 Constructional considerations
5.1 Selection of conductor
Only circular copper conductors, either plain or metal coated, or copper covered steel are recommended for use in a marine environment. Stranded conductors are recommended for general use. Where the applicable product standard specifies solid conductors, consideration should be given to the possible effects of vibration (due to the movement of the ship or installation) or movement (due to motion of the ship or installation). The properties of copper conductors should be in accordance with IEC 60228.
Joints in solid conductors or complete stranded conductors are not permitted, however joints in individual strands are allowed.
NOTE When cables are subject to continuous flexing the advice of the manufacture should be sought.
5.2 Selection of insulation The range of materials for use as conductor insulation should, where possible, be selected from those listed in the IEC 60092-351 or as given in IEC 60096-0-1 and IEC 61 1 56-5-1 .
For cables operating at the higher frequencies the insulation may be solid, cellular or a foam skin composite. The rated operating temperature of the insulating material should be at least 1 0 °C higher than the maximum ambient temperature likely to exist, or to be produced, in the space where the cable is installed.
The insulation should be continuous having a thickness as uniform as possible. The insulation should be applied to fit closely to the conductor. NOTE The user should carefully select the insulation material regarding its electrical characteristics and intended use in the marine environment.
5.3 Cable elements The cores within each pair, triple, or quad should be clearly identified by colour or number as given in the applicable cable standard. The identification used should be durable and legible. The choice of the maximum average length of lay in the finished cable should be selected with respect to the specified crosstalk requirements, handling performance and the pair or quad integrity.
5.4 Selection of screen, core screen or shield
If a screen is required, it may consist of the following:
a) a metallic laminated tape bonded to polyester and a drain wire in direct contact with the metallic side of the tape,
b) plain or metal coated copper braid,
c) a metallic laminated tape bonded to polyester and a drain wire in direct contact with the metallic side of the tape with a plain or metal coated copper braid.