1). To illustrate how these requirements prevent conductor insulation damage, let's consider two extremes in a straight pull situation. Fig. 1. Use 314.28(A) to size pull boxes, junction boxes, and ...

For conductors 4 AWG and larger, you size pull boxes, junction boxes, and conduit bodies per Sec. 314.28. That means the minimum dimensions of boxes and conduit bodies must comply with the following: ...

The Right Hand Thumb Rule also known as Maxwell’s Corkscrew Rule is known to determine the direction of magnetic field in relation to direction of electric current through a straight conductor.