TRANSFORMER INSTALLATIONS

The power company is responsible for installing a padmount or submersible (totally underground) transformer at the customer's site. Conductors to the primary side of the transformer enter at the left side of the transformer; conductors to the secondary side enter at the right. The trench runs from the right side of the transformer to the customer's building.

The customer is responsible for installing the service conductors in the trench, from the transformer to the building.

Safety Clearances Around Transformers
Clearances from padmount transformers to structures are measured from the nearest metal portion of the transformer, to the structure or any overhang.

The clearance from a building is 3 feet if the building has non-combustible walls (brick, concrete, steel, or stone), 10 feet if the building has combustible walls (including stucco).

Other clearances are shown on the next page. These clearances also apply to any oil-filled electrical equipment.

Work Clearances Around Transformers
A minimum clearance of 10 feet of clear, level working space is required in front of a padmount transformer, to allow use of hot sticks. Other clearances are shown below for padmount transformers and for underground t ransformers. These clearances apply to any oil-filled electrical equipment.

 Landscaping and other obstructions must not encroach on these clearances.

For more information:
Guard Posts