What oil filled transformer clearance requirements apply to installations?

Clearance requirements depend on voltage class, installation type, and national electrical and fire codes. Typical requirements address safe working space, approach distance, ventilation, separation from buildings, and access for maintenance and emergency response. Oil filled units also require spill containment and fire safety separation. For pad mounted transformers, clearances usually include front access for switching and fusing, and minimum distances from doors, windows, and combustible structures. Always follow utility standards and local regulations for exact dimensions.