Knowledgebase

Cable cross-section and fuses

with networks with 400 V / 50 Hz

PFC cable cross-sections, fuses

With this table we provide general and non-binding information on standard practice. Connection cross-sections and the extent of protection are dependent not only on the nominal power of the PFC system but also on national regulations, the cable material used and the ambient conditions. The recommendation for the fuse current strength is for short circuit protection, HRC fuses are unsuitable for overload protection with power capacitors. The system installer or planning office are responsible for dimensioning and selecting the line cross-sections and fuses in individual cases.

Output
kvar

Rated current
A

Cable cross-section
NYY-J mm2

HRC fuse
in A

5

7

4 x 2,5

16

7,5

10

4 x 4

20

10

14

4 x 4

25

12,5

18

4 x 6

35

15

22

4 x 6

35

17,5

25

4 x 10

50

20

29

4 x 10

50

25

36

4 x 16

63

30

43

4 x 16

80

37,5

54

4 x 25

100

50

72

3 x 35/16

125

55 - 65

79 - 94

3 x 35/16

160

70 - 85

101 - 123

3 x 70/35

200

86 - 100

124 - 145

3 x 95/50

250

101 - 125

146 - 181

3 x 120/70

250

126 - 160

182 - 231

2’’3 x 70/35

315

161 - 180

233 - 260

2’’3 x 95/50

400

181 - 200

261 - 289

2’’3 x 120/70

400

201 - 250

290 - 361

2’’3 x 150/70

500

251 - 300

362 - 434

2’’3 x 185/95

630

Power factor correction systems with power of over 300 kvar have two separate busbar systems and require two separate feeds. The table applies to conventional and de-tuned PFC systems. It is always necessary to observe the most recent valid specifications (e.g. DIN VDE 0298).

Connection cross-sections only apply for the cited capacitor powers.