Instrumentation Cables 
BS5308 Cable ESI Cable BS 6231 Cable DEF Standard Cable Italian standard

Instrumentation Cables

Def.Standards 61-12 Signal

Defence Standard Signal Types A, C, D & S


Originally developed for military use, Defence Standard cables are designed for connection with ground, sea and

air borne instrumentsand electronic equipment. They offer compact sizing, high working voltage and a large

range of sizes both civil and military fields for high quality obust interconnection Cables. Robust and economical

choice which can also be over sheathed or armoured for direct burial or duct installation.

N.B.: These Cables are not intended for use as power cables and must not be used for the direct connection of

equipment to the main power supply.

All these cables are manufactured generally in accordance with the Defence Standard, however some sizes are

not listed in the Standard but are supplied based on commercial demand.

Technical Information

Working Voltage 440V Rms up to 1600Hz
Temperature Range 0°C to +70°C
Current Rating 0.22 mmsq: 1 amp 0.5 mmsq: 2.5 amps
Nominal Conductor
Max. Resistance @ 20°C
0.22 mmsq: 92 Ω/Km 0.5 mmsq: 40.1 Ω/Km
Bending Radius (Static) 7.5 x Cable diameter


Unscreened type 'A':

Conductor: Flexible Tinned Annealed Copper ;

Insulation: PVC;

Binder: PETP Transparent Tape;


Duct grade versions have a heavy duty Black LDPE sheath.

Coverall Braid 'C':

Conductor: Flexible Tinned Annealed Copper;

Insulation: PVC;

Binder: PETP Transparent Tape;

Screen: Tinned Copper Wire Braid (a minimum fill factor of 0.7);

Sheath: PVC black to form circular cable.

Screened type 'S' has an overall Aluminium foil screen and tinned copper drain wire.


To 61.12 Part 4 17/0.20To 61.12 Part 5 16/0.20

Normally packed on 100m, 500m or 1000m spools, cables can also be cut to length when required.

Colour charts for colour codes up to 36 cores:

Defence standard(A)
Defence standard(C)