## BICC Electrical Cables Handbook

Last updated on 2023-10-09 2 mins. to read## BICC Electrical Cables Handbook

The BICC Electric Cables Handbook give the formula for inductance as follows:

$L=\left(K+0.2\mathrm{ln}\frac{2S}{d}\right)\times {10}^{-6}$

Where:

*L* - cable inductance, H.m^{-1}

*K* - conductor formation constant

*S* - axial spacing between conductors within a cable, mm

- axial spacing between conductors in trefoil, mm

- 1.26 x phase spacing of flat formation conductors, mm

*d* - conductor diameters, mm

For 2, 3 or 4-core circular or sector-shaped cables, multiply the above by 1.02 to obtain the inductance. Multiply by 0.97 for 3-core oval conductors.

Typical values of *K*

Number of wires in the conductor | K |
---|---|

1 (solid) | 0.0500 |

3 | 0.0778 |

7 | 0.0642 |

19 | 0.0554 |

37 | 0.0528 |

61 and over | 0.0514 |