Hi Paul because overhead cables can vary in voltage
and the service provider will have their own safe working practices including distances from the cable / poles ect, then I would contact the service provider to agree further measures for working in and around overhead cables , hope this helps

Chris

Beware that the guidance addresses contact with the lines (or getting close enough to arc from the lines).

I had a site once where we were rigging a mobile crane, outside the zone agreed with National Grid (who had attended site and agreed the limits we would work to). The crane was sitting with the boom fairly extended, fairly flat to the ground, when an operative touched the crane body. He got a shock that was enough to make him jump backwards and fall on his arse.

This caused about equal parts of hilarity and panic on site.

It turned out to be a voltage induced in the crane from the AC field from the lines. A nice big voltage accumulated on the crane bodywork, nicely insulated from anything by big chunky tyres. The shock itself was not dangerous level, but had operative jumped backwards and (say) gone down a hole, or into the path of a vehicle it would not have been so funny. There was also some concern whether the crane control electronics would operate correctly with a big voltage running around.

Site was stopped for about four hours (in a railway possession on a fairly major line - potential big money for over-runs) while it was investigated. We got National Grid out, whose chap basically said "oh yeah, that happens, earth your crane - we always earth our cranes, the bloke you spoke to before should have told you to that". Crane earthed, everyone was satisfied no danger of restarting work.

I've also heard of (but not experienced) similar problems when craning bridge beams into place near and parallel to overhead lines.

So, consider earthing any big bits of steel near power lines, as well as following the guidance in GS6.

Paul i was in a similar position last year, as well as looking at GS6 i contacted the relevant power company who sent a survey officer out and found him very helpful in completing any required documentation and advice from him was good as well better to get them on your side and build a relationship with them.