The reason for the ten foot clearance in front of transformers is safety. The feeder cables are connected to the transformer by an elbow. At times linemen need to disconnect the elbow from the transformer. This is done by using what is called a “hot stick”. The hot stick itself is about 8 feet (don’t remember exact length) long and requires strength to pull the disconnect the elbows. Bushes could create a tripping hazard etc. Also, at times if there could be a problem with transformer or cable which could cause an electric flash when pulling elbows - the clearance makes it safer.
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