Insulators, Transformers and Regulators
Step-down transformers serve to reduce the electricity from primary lines to a voltage more suited for customer use. These transformers are bucket-shaped and can be found between the primary and secondary lines.
Regulators are special transformers that maintain specific voltage levels. They are generally rectangular.
Both transformers and regulators cool their internal components using oil, which can pose explosion, smoke and oil-release hazards. In the event of a fire, be aware of this danger.