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General technical information
■ Current carrying capacities of PVC insulated 600/1000 Volt cables
with copper or aluminium conductors.
In accordance with the 16th edition of the "Wiring Regulations for Electrical Installations".
Basic assumptions: Ambient temperature of 30°C.
Circuit of protected by a OMRON circuit-breaker to IEC 947-2, or a fuse to BS 88 or BS 1361.
Figures must be adjusted by the correction factors for ambient temperature and/or cable grouping as detailed in the IEE regs.
Conductor
size
In conduit or trunking (enclosed)
Single-phase
mm²
Cu [A]
Al [A]
Single core, PVC insulated cable non-armoured, copper or aluminium conductors.
1.0
13.5
1.5
17.5
2.5
24.0
4.0
32.0
6.0
41.0
10.0
57.0
16.0
76.0
25.0
101.0
35.0
125.0
50.0
151.0
118.0
70.0
192.0
150.0
95.0
232.0
181.0
120.0
296.0
210.0
150.0
300.0
234.0
185.0
341.0
266.0
240.0
400.0
312.0
300.0
458.0
358.0
400.0
546.0
500.0
626.0
630.0
720.0
Twin and multi-core PVC insulated cable, non-armoured, copper or aluminium conductors.
1.0
11.0
1.5
14.0
2.5
18.5
4.0
25.0
6.0
32.0
10.0
43.0
16.0
57.0
54.0
25.0
75.0
71.0
35.0
92.0
86.0
50.0
110.0
104.0
70.0
139.0
131.0
95.0
167.0
157.0
120.0
192.0
150.0
219.0
185.0
248.0
240.0
291.0
300.0
334.0
400.0
-
98
Low Voltage Switch Gear
Clipped to surface or cable tray,
bunched, embedded in plaster
(unenclosed)
Three-phase
Single-phase
Cu [A]
Al [A]
Cu [A]
-
12.0
-
-
15.5
-
-
21.0
-
-
28.0
-
-
36.0
-
-
50.0
-
-
68.0
-
-
89.0
-
114.0
-
110.0
-
141.0
134.0
104.0
182.0
171.0
133.0
234.0
207.0
161.0
284.0
239.0
186.0
330.0
262.0
204.0
381.0
296.0
230.0
436.0
346.0
269.0
515.0
394.0
306.0
594.0
-
467.0
-
694.0
-
533.0
-
792.0
-
611.0
-
904.0
-
11.5
-
-
15.0
-
-
20.0
-
-
27.0
-
-
34.0
-
-
46.0
-
62.0
48.0
80.0
62.0
112.0
99.0
77.0
138.0
118.0
92.0
168.0
149.0
116.0
213.0
179.0
139.0
258.0
-
206.0
160.0
299.0
-
225.0
184.0
344.0
-
255.0
210.0
392.0
-
297.0
248.0
461.0
-
339.0
258.0
530.0
-
402.0
-
634.0
Appendix
Three-phase
Al [A]
Cu [A]
Al [A]
15.5
-
14.0
20.0
-
18.0
27.0
-
25.0
37.0
-
33.0
47.0
-
43.0
65.0
-
59.0
87.0
-
79.0
-
104.0
-
129.0
134.0
167.0
172.0
214.0
210.0
261.0
245.0
303.0
283.0
349.0
324.0
400.0
384.0
472.0
444.0
545.0
-
634.0
-
723.0
-
826.0
15.0
-
13.5
19.5
-
17.5
27.0
-
24.0
36.0
-
32.0
46.0
-
41.0
63.0
-
57.0
85.0
66.0
76.0
83.0
96.0
103.0
119.0
125.0
144.0
160.0
184.0
195.0
261.0
245.0
259.0
283.0
299.0
324.0
341.0
384.0
403.0
444.0
464.0
-
557.0
Fixed to vertical surface of wall or open
cable trench with 20 mm separation
between cables and wall
Single-phase
Cu [A]
Al [A]
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
126.0
-
-
156.0
-
123.0
191.0
144.0
156.0
246.0
185.0
194.0
300.0
225.0
226.0
349.0
261.0
261.0
404.0
301.0
299.0
463.0
344.0
354.0
549.0
407.0
410.0
635.0
469.0
-
732.0
-
-
835.0
-
-
953.0
-
-
17.0
-
-
22.0
-
-
30.0
-
-
40.0
-
-
51.0
-
-
70.0
-
59.0
94.0
73.0
73.0
119.0
89.0
90.0
148.0
111.0
110.0
180.0
135.0
140.0
232.0
173.0
170.0
282.0
210.0
197.0
328.0
-
227.0
379.0
-
259.0
434.0
-
305.0
514.0
-
351.0
593.0
-
-
715.0
-
Three-phase
Cu [A]
Al [A]
-
-
-
-
-
-
-
-
-
-
-
-
-
-
112.0
-
141.0
-
172.0
132.0
223.0
169.0
273.0
206.0
318.0
240.0
369.0
277.0
424.0
317.0
504.0
375.0
584.0
435.0
679.0
-
778.0
-
892.0
-
14.5
-
18.5
-
25.0
-
34.0
-
43.0
-
60.0
-
80.0
61.0
101.0
78.0
126.0
96.0
153.0
117.0
196.0
150.0
238.0
183.0
276.0
212.0
319.0
245.0
364.0
280.0
430.0
330.0
497.0
381.0
597.0
-
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