manny78

It's a ground mounted transformer. They're very safe. All the HV and LV cable ends are contained within the body of the transformer, which itself will be earthed. My day job is an overhead linesman for a distribution company so i deal with this stuff every day. It's always worth ringing your local DNO for advice....which will be Western Power Distribution in your area (0800 096 3080). Give them the substation number which should be clearly written on the entrance to the sub. They'll send someone out free of charge and either arrange to do proximity work themselves or organise an outage where you can carry out the work with all electrical kit turned off and earthed. In this instance, i'm fairly sure they'd send out a lines team to trim whatever needed trimming in and around the substation up to a point where you could safely take over. They shouldn't let you into the substation compound itself as by rights you need a written substation access authorisation, and that's a bit of a ball ache to get for anyone outside of the industry. If you could deal with the brash they cut too, they'd be more than grateful!