R
TABLE 4H4A Multicore 700C armoured thermoplastic insulated
cables (Aluminium Conductors)
Ambient temperature : 30°C
Ground ambient temperature: 20°C
Conductor operating temperature:70°C
CURRENT-CARRYING CAPACITY (amperes):
Conductor
crosssectional
area
Reference Method D
Reference Method E
(direct in groundor in ducting in
(in free air or on a perforated
cable tray horizontal or vertical) ground, in or around buildings)
Reference Method C
(clipped direct)
1 three- or fourcore cable,
three-phase a.c.
5
1 two-core
cable,
single-phase
a.c. or d.c.
6
(A)
(A)
(A)
(A)
58
71
61
-
-
76
94
1163
143
174
94
115
139
175
211
80
99
119
151
186
77
93
109
135
159
64
77
91
112
132
202
232
265
312
360
-
216
250
287
342
399
-
150
169
190
218
247
1 three- or fourcore cable,
three-phase a.c.
1
1 two
core cable,
single phase
a.c. or d.c.
2
(mm²)
1 three- or fourcore cable,
three-phase a.c.
3
1 two-core
cable,
single-phase
a.c. or d.c.
4
(A)
(A)
16
68
25
35
50
70
95
89
109
131
165
199
120
150
185
240
300
-
VOLTAGE DROP (per ampere per metre)
TABLE 4H4B
7
Conductor operating temperature: 70°C
Conductor
crosssectional
area
Two-core
cable, d.c.
Two-core cable,
single-phase a.c.
Three- or four-core cable,
three-phase a.c.
1
2
3
4
(mm²)
(mV/A/m)
(mV/A/m)
(mV/A/m)
16
4.5
4.5
3.9
r
x
z
r
x
z
25
35
50
70
95
2.9
2.1
1.55
1.05
0.77
2.9
2.1
1.55
1.05
0.77
0.175
0.170
0.170
0.165
0.160
2.9
2.1
1.55
1.05
0.79
2.5
1.80
1.35
0.90
0.67
0.150
0.150
0.145
0.140
0.140
2.5
1.80
1.35
0.92
0.68
120
150
185
240
300
-
-
-
-
0.53
0.42
0.34
0.26
0.21
0.135
0.135
0.135
0.130
0.130
0.55
0.44
0.37
0.30
0.25
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.
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