Grounding Of System Cables; Cable Connections And Terminations - Simrad EC150-3C Installation Manual

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Simrad EC150-3C Installation Manual

Grounding of system cables

All metallic cable coverings (armour, metallic sheathing and other protection) must

be electrically connected to the vessel's hull at both ends except in the case of final

sub-circuits where they should be connected at the supply end only.

Grounding connections should be made using a conductor which has a cross-sectional

area appropriate for the current rating of the cable, or with a metal clamp which grips

the metallic covering of the cable and is bonded to the hull of the vessel. These cable

coverings may also be grounded by means of glands specially intended for this purpose

and designed to ensure a good ground connection. The glands used must be firmly

attached to, and in good electrical contact with, a metal structure grounded in accordance

with these recommendations.

Electrical continuity must be ensured along the entire length of all cable coverings,

particularly at joints and splices. In no case should the shielding of cables be used as the

only means of grounding cables or units.

Metallic casings, pipes and conduits must be grounded, and when fitted with joints these

must be mechanically and electrically grounded locally.

All cable connections are shown on the applicable cable plan and/or interconnection

diagrams.

Where the cable plan shows cable connections outside an equipment box outline, the

connections are to be made to a plug or socket which matches the plug or socket on

that particular item of equipment.

Where two cables are connected in series via a junction box or terminal block, the

screens of both cables must be connected together, but not grounded.

Care must be taken to ensure that the correct terminations are used for all cable

conductors, especially those that are to be connected to terminal blocks. In this case,

crimped sleeve-terminations must be fitted to prevent the conductor core from fraying

and making a bad connection with the terminal block. It is also of the utmost importance

that where crimped terminations are used, the correct size of crimp and crimping tool are

used. In addition, each cable conductor must have a minimum of 15 cm slack (service

loop) left before its termination is fitted.

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