Fire Resistant vs Flame Retardant Marine Cables: What's the Difference?

Understanding the Difference for Safer Marine and Offshore Installations

When specifying electrical cables for ships or offshore platforms, the terms fire resistant and flame retardant are often used interchangeably. Although they sound similar, they serve different purposes and are tested against different international standards.

Choosing the wrong cable can affect the safety and reliability of critical onboard systems during a fire. This article explains the key differences and helps you select the right cable for your marine application.

What Is a Flame Retardant Marine Cable?

A flame retardant cable is designed to limit the spread of fire. If exposed to a flame, the cable's outer sheath and insulation resist burning and help prevent the fire from travelling along cable routes.

Once the external flame source is removed, the cable is designed to self-extinguish.

Typical Applications

• General power distribution

• Lighting circuits

• Accommodation areas

• Machinery spaces

• Control panels

• Cable trays

Benefits

• Reduces fire propagation

• Helps protect adjacent cables

• Minimises damage to onboard electrical systems

• Suitable for most non-emergency circuits

What Is a Fire Resistant Marine Cable?

A fire resistant cable is designed to continue carrying electrical power during a fire for a specified period of time.

Even when exposed directly to flames, the cable maintains circuit integrity so that essential safety equipment remains operational.

Typical Applications

• Emergency lighting

• Fire detection and alarm systems

• Emergency shutdown systems

• Fire pumps

• Public address systems

• Emergency communication systems

• Navigation and essential control systems

Benefits

• Maintains power during fire emergencies

• Supports evacuation and firefighting operations

• Improves vessel safety

• Helps meet SOLAS and classification society requirements

The Key Difference

Flame RetardantFire ResistantPrevents the spread of fireContinues operating during a fireProtects surrounding cablesProtects critical electrical circuitsStops flames travelling along cable runsMaintains circuit integrity under fire conditionsUsed for general electrical installationsUsed for emergency and life safety systems

Many marine projects require both characteristics, particularly for essential services.

International Standards

Marine and offshore cables are commonly tested to internationally recognised standards, including:

Flame Retardant

• IEC 60332 series

• Tests the cable's ability to resist flame propagation.

Fire Resistant

• IEC 60331 series

• Tests whether the cable continues to operate while exposed to fire.

Depending on the vessel type and application, additional standards and classification society requirements may also apply.

Why Low Smoke Halogen-Free (LSHF) Matters

Modern marine cables are often manufactured with Low Smoke Halogen-Free (LSHF) compounds.

Compared with conventional PVC cables, LSHF cables provide several important safety advantages during a fire:

• Lower smoke generation

• Reduced toxic gas emission

• Improved visibility for evacuation

• Less corrosive damage to electrical equipment

These characteristics are particularly important on passenger vessels, offshore platforms, naval ships, and enclosed machinery spaces.

Which Cable Should You Choose?

Consider the purpose of the circuit:

Choose Flame Retardant Cable for:

• General shipboard power

• Lighting

• Distribution circuits

• Standard control wiring

Choose Fire Resistant Cable for:

• Emergency systems

• Fire protection equipment

• Alarm systems

• Emergency communications

• Essential navigation equipment

When in doubt, consult your vessel's electrical specification, classification society requirements, or equipment manufacturer.

Quality Matters

Marine electrical systems operate in harsh environments involving vibration, humidity, salt spray, oil, and temperature extremes. Selecting high-quality marine cables from an established manufacturer helps improve reliability, reduce maintenance, and support long service life.

Marineboys supplies genuine TMC marine and offshore cables suitable for a wide range of shipbuilding, repair, and offshore applications.

If you are unsure which cable is appropriate for your project, our team can assist with product selection based on your technical requirements.