In addition, there is a possibility that the transformer will explode because of the hermetically sealed tank of flammable oil. There are several steps that line workers can take in order to prevent injuries from distribution transformers. First and foremost, line workers should wear the following protective equipment: hard hats, rubber gloves, safety glasses, and fire retardant clothing. A line worker should always connect the neutral first before connecting the transformer and remove it last before disconnecting the transformer. To avoid the possibility of backfeed, there should not be any paralleling of transformers across any point that could be used to isolate a line section. A line worker should always wear rubber gloves if working on the secondary coil of a faulty transformer. Transformers should be de-energized before servicing or repairing. Finally, before a transformer is re-fused, a line worker should thoroughly inspect the transformer and test it with an approved instrument. When refusing transformers, line workers should also disconnect the customer's load, and use an extendable live line tool. In fact, it is recommended that line workers maintain a distance of at least 10 feet from the transformer...

Prior to refusing, transformers should be tested with a smaller test fuse. Finally, transformers should be replaced rather than re-fused if the pressure relief valve has operated or an auxiliary current limiting fuse has blown.
Works Cited kVA Rating." Fundamentals of Electricity. 2005. El Paso Electric Company. 21 Mar. 2005 http://elpaso.apogee.net/foe/ftdtk.asp.

Overhead Transformers." Fundamentals of Electricity. 2005. El Paso Electric

Company. 21 Mar. 2005 http://elpaso.apogee.net/foe/ftdto.asp.

Protective Equipment." Fundamentals of Electricity. 2005. El Paso Electric

Company. 21 Mar. 2005 http://elpaso.apogee.net/foe/ftdtp.asp.

Transformer." Wikipedia.org. 2005. Wikimedia. 21 Mar. 2005 http://en.wikipedia.org/wiki/Transformer.

Underground Transformers." Fundamentals of Electricity. 2005. El Paso Electric Company. 21

Mar. 2005 http://elpaso.apogee.net/foe/ftdtu.asp.

What is a Transformer?" Cutler-Hammer Training: Module 4. 2004. Eaton Electrical, Inc. 21

Mar. 2005 http://www.eatonelectrical.com/unsecure/html/101basics/Module04/Output/TypesTransformers.html