Power cables supports/clamps

[chorus]

Hello,
I'm after some information on the effects of fault currents on conductors and their supports, can't find any formula to define max distance between two cable ties/clamps on HV/LV power cables to withstand the fault current.

 

[7anoter4]

The maximum mechanical force between conductors during exposure to a short circuit (equation recognized by EN-50368:2003) is stated as:
Ft = (0.17 x IPEAK2) / S
Where:
Ft= Maximum Force on Conductor (N/m)
IPEAK = 1st Cycle Peak Asymmetrical Short Circuit Current (kA)
S= Spacing between Conductor centers (meters)
The force on one tie will be Ft*lng where lng = distance [along] between two ties[m].
This formula gives the static load instantaneously created by the short circuit, however the phase changes of the alternating current mean that the forces on the cable and their direction are changing continuously.

 

[SEAsiaspark]

Have a look on you tube there was some footage of a manufacturer testing their supports under different fault levels it was quite interesting to watch.

SEAsiaspark