What is a requirement for the location of transformers to reduce exposure to energized parts?

• A. Totally enclosed or located 15 ft above ground, or housed or fenced 6 ft high with 3 ft clearance from energized parts
• B. Left in an open area
• C. Mounted at ground level near water
• D. Attached to moving equipment

Answer: (A)

To reduce exposure to energized parts, transformers must be kept out of reach or protected by barriers. The requirement can be met in one of three ways: the transformer is totally enclosed, or it is located high enough above the ground (at least 15 feet) so workers can’t reach energized parts, or it is housed or fenced to a height of 6 feet with a minimum clearance of 3 feet from any energized parts. These approaches create physical barriers or sufficient distance to prevent accidental contact and to limit arc-flash and shock hazards.

Choosing placements like leaving the transformer in an open area, mounting it at ground level near water, or attaching it to moving equipment would increase the chance of contact with energized parts or expose workers to moisture, movement, or other risks, which is why the enclosure or height-plus-barrier option is required.