However, it should be understood that disposition of a rib is not limited to the above-described embodiment; for example, at least one rib may also be disposed on the groove, and a recess fitting the rib may be disposed on the protrusion.

Based on the above, the first portion and the second portion are assembled by a fit between a groove and a protrusion, so that the first portion and second portion of the potting spacer may be assembled properly, thereby making it convenient to mount the potting spacer in a chamber of the electrical apparatus. In addition, when an electrical conductor is provided, this helps keep the electrical conductor in position, in a closed status in which the first portion and the second portion are assembled.

In certain embodiments, the through hole is provided with at least one contact rib on a surface in contact with the electrical conductor.

Referring to FIG. 4A, an extension direction of the at least one contact rib, for example, may be perpendicular to an extension direction of the electrical conductor, or an extension direction of the at least one contact rib may also be parallel to an extension direction of the electrical conductor.