Electrical & Physical Data

 

Physical Data

Nominal Area*
sq.mm

Conductor
no. of
strands/mm

CPC

no. of
strands/mm

Nominal

insulation

thickness

mm

Nominal cable

diameter

mm

Approx. weight

of cable

kg/1000m

2
core

3
core

4
core

5
core

2
core

3
core

4
core

5
core

1.0
7/0.44
7/0.44
0.70
8.3
8.7
9.5
85
105
132
1.5
7/0.53
7/0.53
0.70
8.7
9.6
10.2
11.1
98
135
201
241
2.5
7/0.67
7/0.67
0.70
9.6
11.2
12.1
12.8
143
199
221
250
4.0
7/0.85
7/0.85
0.80
11.2
12.2
13.3
14.9
193
244
304
375
6.0
7/1.04
7/1.04
1.00
13.0
13.9
15.9
16.6
284
355
428
485

* 10.0 sq.mm available on request

 

Electrical Data

Area
sq.mm

Maximum DC
resistance
ohms/Km
@20°C

Nominal AC
resistance
ohms/Km
@90°C, at 50Hz

Inductive
reactance
ohms/Km,
at 50Hz

Maximum
continuous
conductor
operating temp.°C

Short circuit
rating in
kA for
1 sec.*

1.0
18.1
23.16
0.103
70
0.11
1.5
12.1
15.3
0.100
70
0.17
2.5
7.41
9.43
0.097
70
0.29
4.0
4.61
5.86
0.092
70
0.46
6.0
3.08
3.93
0.088
70
0.69
* Based upon a K value of 115, taken from BS7671:2008 table 43.1.


Temperature Correcting Factors for Cables in free air other than 30°C
Correction for ambient temperature
Ambient temp °C
25
35
40
45
50
55
60
1.03
0.94
0.87
0.79
0.71
0.61
0.50


Correction rating for grouping
No of cables
2
3
4
5
6
8
9
12
Clipped direct
0.80
0.70
0.65
0.60
0.57
0.52
0.50
0.45
On cable tray
0.88
0.82
0.77
0.75
0.73
0.72
0.72
0.72


Current Ratings – Ambient temp. at 30°C, conductor operating temp. 70°C as BS7671
Clipped direct – ref method C

Nominal
Area
sq.mm

Two core cable, single phase AC or DC
Three or four core cable, three phase AC

Current rating
amps

Volt drop mV
per amp per M

Current rating
amps

Volt drop mV
per amp per M

1.0
15
44
13.5
38
1.5
19.5
29
17.5
25
2.5
27
18
24
15
4.0
36
11
32
9.5
6.0
46
7.3
41
6.4


On cable tray – ref method E
Nominal

Area
sq.mm

Two core cable, single phase AC or DC
Three or four core cable, three phase AC

Current rating
amps

Volt drop mV
per amp per M

Current rating
amps

Volt drop mV
per amp per M

1.0
17
44
14.5
38
1.5
22
29
18.5
25
2.5
30
18
25
15
4.0
40
11
34
9.5
6.0
51
7.3
43
6.4
Current ratings are based on a “single circuit” in accordance with the IEE Wiring Regulations BS7671, Table 4D2A. Where a conductor operates at a temperature exceeding 70°C it shall be ascertained that the equipment connected to the conductors is suitable for the conductor operating temperature. (BS7671 reg 512.1.5).Important: All information is believed to be correct at time of issue. The Pre-Wired Conduit Company Ltd reserve the right to alter dimensions, specifications and materials at any time under its development programme.