General Marine Cables

Coaxial cable

Feeds radar, GPS, VHF and satellite communication antennas; signal loss over the cable run is a real design factor at the frequencies these systems use, so run length and cable grade are chosen together, not the cable alone.

Heating trace cable

Self-regulating or fixed-wattage electric heating cable wrapped along pipework carrying viscous fuel or cargo that must be kept above its pour point, controlled by a thermostat rather than run continuously.

Selection

Each type is selected on the parameter that actually limits it: screening effectiveness and core count for control cable, attenuation and connector compatibility for fibre and coaxial runs, and heat output per metre matched to pipe insulation for heating cable. Fire performance class still applies across all of them, following the same routing and segregation logic as power cable.

• Screening or armour appropriate to the electromagnetic environment the cable passes through, especially near high-power switchboards or thrusters
• Connector and termination compatibility confirmed before ordering fibre or coaxial cable, since a mismatched connector standard makes a correctly rated cable useless
• Heating cable output matched to the pipe's insulation and the lowest ambient temperature the ship actually trades in, not a generic figure
• Fire performance class consistent with where the cable is routed, same as any other shipboard cable

Regulations and class

The IEC 60092 series covers construction and fire testing for shipboard cable generally, including the control, instrumentation and low-power types in this group. SOLAS Chapter II-2 routing and segregation requirements apply here too, since a fibre backbone for the integrated bridge system still needs to survive a fire in the space it passes through if it serves a safety function. Heating trace cable installation is normally covered by the equipment manufacturer's certified installation method rather than a cable-specific class rule, since the hazard being managed is electrical, not structural.

Typical faults

What to look for in a supplier

• Type approval to IEC 60092 for the specific cable type and fire performance class
• Connector and termination kits matched to the cable, sourced together rather than separately
• Technical support for fibre and coaxial link budget calculations, not just the cable itself
• Heating cable output curves referenced to the pipe sizes and insulation the ship actually uses

Log fibre optic attenuation at commissioning and check it again after any major refit - a link that still works can be running with far less margin than it had on day one, and a small further loss is what finally breaks it.