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The minimum calculated height of a pull box is determined based on a standard requirement for accessibility and operational convenience in electrical installations. Specifically, the National Electrical Code (NEC) outlines these height requirements to ensure that electrical devices are reachable and safely accessible.

For a pull box with dimensions of 6" x 6", the relevant factors influencing the height include the overall size of the box and ensuring that it is located at an accessible height for maintenance and operation. The standard requisite often referred to is that the top of the pull box remains within a certain height range above the floor level.

In many cases, a height of 42 inches is commonly accepted as the minimum height for pull boxes. This figure takes into account both safety and operational efficiency, ensuring that personnel can access the equipment without excessive bending or reaching. Moreover, this height accommodates both the needs of users and safety considerations, minimizing risks associated with working near the ground level.

The other heights provided do not align with these established standards for the placement of pull boxes, emphasizing the importance of adhering to the NEC guidelines for safe and efficient electrical installations.