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

Instrumentation Cables

Application :

These cables are suitable for internal wiring of appliances and switch, control, metering and instrument panels of

switchgear, etc

Construction

Standards : BS 6231, UL 83, CSA C22.2, UL Flame test UL 1581/VW1 FT1 FT2

Conductor : plain annealed

Insulation : Flexible PVC

Temperature Range: 0 o C -105 o C

Voltage rating : 0.6 / 1kV

Min. Bending radius : 3 x Overall diameter

Insulation colours : 0.5mm² to 25 mm² Red, black, white, grey, brown, orange, yellow, blue, green, and

green/yellow.

35mm² to 120 mm² Red, black and green/yellow. . Other colours available on request.

Relevant Standards :

To BS6231, UL Style 1015, 1028, 1283, 1284; CSA TEW 105 °C; UL VW -1 Vertical Flame Test

Current Ratings

The table below lists the full Thermal current ratings which will raise the Conductor temperature to 85 °C when

one cable is installed in free air at an Ambient temperature of 45 °C.

These ratings are applicable for installations which ensure that the operation of the protective device is not

greater than 1.45 times the continuous current carrying capacity of the cable.

Where protection is by means of semi-enclosed fuses to BS 3036 the rating must be multiplied by a factor of

0.76.

Note:Sizes 150.0mm², 185.0mm² and 240.0mm², 300.0mm² & 400mm² are classed as dual Rated and are

manufactured to UL & BS 6231 only.

SIZE
mm²		 RESISTANCE
PER 1000M
OF 20 °C
OHM 		CURRENT
RATING
AMP 		APPROXIMATE
VOLT DROP
CONSTANT
MV/A/M
0.5 39 11 46
0.75 26 14 31
1 19.5 17 22
1.5 13.3 21 15
2.5 7.98 30 9.1
4 4.95 41 5.7
6 3.3 53 3.8
10 1.91 75 2.2
16 1.21 100 1.4
25 0.78 136 0.89
35 0.554 167 0.64
50 0.386 204 0.45
70 0.272 259 0.32
95 0.206 321 0.24
120 0.161 374 0.19
150 0.129 429 0.15
185 0.106 496 0.13
240 0.0801 595 0.092
300 0.0641 680 0.073
400 0.06 868 @70 C 0.145

The voltage drop figures are for one cable only. For other circuit arrangements they should be adjusted as follows:

Single-phase 50Hz ac or 2-wire dc circuit's x2
Three-phase 50Hz ac circuit's x1.732

BS 6231 Instrumentation Cables

Range & Dimensions for BS 6231 Instrumentation cables

SIZE
mm²		 STRANDING
mm 		SIZE
AWG 		UL STYLE
NUMBER 		NOMINAL
INSULATION
mm		 NOMINAL
OVERALL
DIAMETER
mm		 WEIGHT
kg/km
0.5 16/0.20 22 1015 0.8 2.6 12
0.75 24/0.20 20 1015 0.8 2.8 15
1 32/0.20 18 1015 0.8 3 18
1.5 30/0.25 16 1015 0.9 3.3 23
2.5 50/0.25 14 1015 1.0 3.7 34
4 56/0.30 12 1015 1.0 4.4 50
6 84/0.30 10 1015 1.3 5.1 71
10 80/0.40 8 1028 1.5 6.9 123
16 126/0.40 6 1283 1.5 8.6 209
25 196/0.40 4 1283 1.6 10.5 296
35 276/0.40 2 1283 2.0 11.9 400
50 396/0.40 1 1284 2.0 14.4 582
70 360/0.50 2/0 1284 2.0 16.7 796
95 475/0.50 3/0 1284 2.3 19 1025
120 608/0.50 4/0 1284 2.4 20.5 1282
150 756/0.50 MCM300 104 2.4 23.14 1627
185 925/0.50 MCM350 104 2.4 25.4 1959
240 1221/0.50 MCM500 104 2.8 28.66 2254
300 1525/0.50 MCM600 1015 - 31.5 3157
400 2013/0.50 MCM800 1284 - 36 4051