Is there a required minimal burial depth for underground cables in the UK? In all countries I know it's 60cm which isn't that far below the alleged 18-20" working range of the spikes.
Generally 45cm for domestic with a marker 15cm above it, or 60cm for other locations. Although all cables "shall be at sufficiant depth to avoid being damaged by any reasonably foreseeable distrubances to the ground"
That sort of machinery may not have been foreseeable when the cable was laid. Ground level may also have been changed since.....
