Where does the cover go back into the core?

• A. Mark 2
• B. Mark 1
• C. Mark 3
• D. Mark 4

Answer: (A)

When you reassemble a laminated magnetic core and its cover, the cover must sit in the position where it mates perfectly with the core’s locating features. That alignment ensures the magnetic path stays continuous, the insulation and winding are protected, and the cover and gasket seat evenly without creating gaps or interference.

The correct placement is the one that lines up with the core’s locating pins/grooves, so the cover can be pressed flush and the fasteners line up with their threaded holes. In that position the gasket seals properly and there’s no risk of pinching windings or leaving an air gap that could cause overheating or arcing.

Other positions misalign the cover with the core’s locating features, causing a poor seat, possible contact with winding insulation, or misaligned fasteners and gaps in the seal.