If 'lectricity is not causing problems at an MVA, maybe its best to leave it alone...
Always carry a sharp knife! [Leatherman is a better option and more versatile, but also more expensive]
Big fan of knives. I carry both a leatherman and a knife - for two different purposes. Leatherman for rescue/technical issues, big knife for extricating myself from ropes/BA Entanglement. The leatherman is happily in a pocket, the Knife is in easy reach with either hand on the outside of my tunic.
A roll of duck tape or electricity tape is always handy...for anything.
A short ~4-5m length of 8mm rope is great for all kinds of uses. Keep them doors shut for CFBT, lash ladders to buildings, support vertical hose lays... the sky is the limit.