The bottom wire of a 7200 volt two-wire overhead power line is usually the non-energized grounded conductor. It doesn't really matter whether brush touches it or not, other than mechanical/wind issues. Similarly, the brush can be pruned away from this grounded conductor without much worry, so long as the brush is not also close to the (often not insulated) high voltage wire.
There's no guarantee that this is the actual arrangement in your case. If you know enough about electricity to look up at the transformer wiring and also the ground electrode wire coming down the pole to figure out which overhead wire is hot and which overhead wire is grounded, you can consider (at your own risk) doing some pruning.
If the bottom wire is energized, the branch only needs to touch this one wire to be dangerous.
In general, the high voltage wires leading TO the transformer belong to the utility company and it is their responsibility to do the needed pruning. I suspect they don't want you anywhere near such wires. Give them a call about the pruning problem and they'll probably get it taken care of. I would not fool with such an issue depending on wooden pruners to keep me "safe" from 7200 volts.
Wires leading FROM the transformer to your various structures may be your responsibility, that situation is much more dependent on your location and service provider. At 120 volts line-to-ground, and dealing with conductors that are usually insulated, the risks are lower as well.
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