4e4a
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TABLE 4E4A Multicore 900C armoured thermosetting insulated
cables (Copper Conductors)
Current Ratings
7
Ambient temperature : 30°C
Ground ambient temperature: 20°C
Conductor operating temperature:90°C CURRENT-CARRYING CAPACITY (amperes):
Conductor
cross-
sectional
area
1
Reference Method C
(clipped direct)
Reference Method E
(in free air or on a perforated
cable tray horizontal or vertical
1 two
core cable,
single phase
a.c. or d.c.
2
1 three- or four-
core cable,
three-phase a.c.
3
1 two
core cable,
single phase
a.c. or d.c.
4
1 three- or four-
core cable,
three-phase a.c.
5
(mm²)
1.5
2.546
1016
2535507095
120150185240300
400
(A)
25
3344567899
131162197251304
353406463546628
728
(A)
29
39526690115
152188228291354
410472539636732
847
(A)
23
3142537394
124154187238289
335386441520599
673
(A)
27
36496285110
146180219279338
392451515607698
787
Reference Method D
(direct in groundor in ducting in
ground, in or around buildings)
1 two
core cable,
single phase
a.c. or d.c.
6
1 three- or four-
core cable,
three-phase a.c.
7
(A)
21
2836445875
96115135167197
223251281324365
-
(A)
25
3343537191
116139164203239
271306343395446
-
NOTES:
1. Where a conductor
operates at a temperature
exceeding 70°C it must
be ascertained that the
equipment connected to
the conductor is suitable
for the conductor operat-
ing temperature (see
Regulation 512.1.2).
2. Where cables in this
table are connected to
equipment or accessories
designed to operate at a
temperature not exceed-
ing 70°C, the current
ratings given in the equiv-
alent table for 70°C ther-
moplastic insulated cables
(Table 4D4A) must be
used (see also Regulation
523.1)
VOLTAGE DROP (per ampere per metre) TABLE 4E4B Conductor operating temperature: 90°C
Conductor
cross-
sectional
area
1
Two-core
cable, d.c.
2
Two-core cable,
single-phase a.c.
3
Three- or four-core cable,
three-phase a.c.
4
(mm²)
1.5
2.546
1016
(mV/A/m)
31
19127.94.72.9
(mV/A/m)
31
19127.94.72.9
r x z
(mV/A/m)
27
16106.84.02.5
r x z
25
35
50
70
95
120
150
185
240
300
400
1.85
1.35
0.98
0.67
0.49
0.39
0.31
0.25
0.195
0.155
0.120
1.85
1.35
0.99
0.67
0.50
0.40
0.32
0.26
0.20
0.16
0.13
0.160
0.155
0.155
0.150
0.150
0.145
0.145
0.145
0.140
0.140
0.140
1.90
1.35
1.00
0.69
0.52
0.42
0.35
0.29
0.24
0.21
0.190
1.60
1.15
0.86
0.59
0.43
0.34
0.28
0.22
0.175
0.140
0.115
0.140
0.135
0.135
0.130
0.130
0.130
0.125
0.125
0.125
0.120
0.120
1.65
1.15
0.87
0.60
0.45
0.37
0.30
0.26
0.21
0.185
0.165
All tables are reproduced by kind permission of The Institution of Engineering & Technology from IEE Regs, 17th Edition However, it should be noted that in
order to apply these tables correctly, reference is required to appendix 4 of the 17th edition of the wiring regualtions which may be obtained from: Institution
of Engineering & Technolgy, Michael Faraday House,Six Hills Way, Stevenage, Hertfordshire, ENGLAND, SG1 2AY.