TRATOS-MOD 61-12® 4

Defence Standard 61-12 Part 25 (previously NES525) Multi Pair Collectively Screened Special Tratos JBA® Limited Fire Hazard (LFH) Thin Wall Insulated and Sheathed Cable for Military Vessels

Special Cables / Defence & Military Cables

DEF 61-12 Part 25 (NES525) cables incorporate LFH thin wall insulation and LFH sheath for reduced levels of smoke and corrosive products in the event of a fire. These cables have been widely adopted as the basis for lightweight Limited Fire Hazard (LFH) cables by the MOD (N) and many other Navies worldwide.

The cores in these cables comply with DEF STAN 61-12 Part 18
This range of collectively screened multi pair cables are made from Type 1 pliable type cores.

These cables contain a tinned copper wire braid collective screen to confine the electric field and to limit the external electrical influences

The sheath on these cables complies with DEF STAN 61-12 Part 31

These cables are constructed to be compact and circular able to withstand the normal installation hazards encountered during shipbuilding including reeving in, tight bends, glanding, banding and clipping.

These cables are used for both the ships equipment and systems as well as the weapon equipment and systems. The Nato Stock Number (NSN), nominal conductor area, nominal stranding and the conductor formations for these types of cables are shown in DEF STAN 61-12 Part 25, tables 15 and 16 with additional details given in DEF STAN 61-12 part 18.

Each individual cable has a unique NATO Stock Number (NSN), or National Stock Number as it is known in the United States of America (USA).


DEF STAN 61-12 Part 25 Issue 5 (formerly NES 525)

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 TratosMOD – Defence


DEF 61-12 Part 25 (NES525) cables are typically used for communication, control and instrumentation circuits in Her Majesty surface ships and vessels where electrical screening is required. They are installed and used in both flexing and fixed applications and are suitable for use where fuel, lubricating oils, hydraulic fluids and water are present.



  • Stranded tinned annealed copper wire conductors according to Def Stan 61-12 Part 18


  • Thin wall Type 1 LFH Tratos Defence Insulation to Defence Standard 61-12 part 25


  • Two cores twisted to form a pair, the required number of pairs assembled in layers in alternate directions


  • Tinned annealed copper wire braid


  • Special Tratos Defence JBA® Black LFH elastomeric compound according to Defence Standard 61-12 part 31
  • Cable sheath marking + Tratos + year of manufacture + Def Stan
61-12 part 25 + Last seven digits of the NSN number"


Technical Specifications


  • Cores in cable – Clause 10 of DEF STAN 61-12 Part 25 Issue 5
  • Sheath on multicore cable – DEF STAN 61-12 Part 31
  • Complete cable – Flammability – Def Stan 61-12 Part 0 clause 15.12.


  • Voltage Rating: 600 Vrms/800 V d.c. (between cores, or between cores and ships structure, or between cores and cable screen)
  • Service life 40,000 hours at a continuous conductor temperature of 85°C
  • These cables are suitable for use at conductor temperatures from -30°C to +105°C.
  • Minimum cable bending radius: Flexing applications 10 x overall cable diameter, fixed applications 4 x overall cable diameter.

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