PFC cable cross-sections, fuses (with networks with 400 V / 50 Hz)
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.
Important information:
When expanding existing systems, the busbar division must be carried out in advance!
