Electrical apparatus and plug

An electrical apparatus comprising:

• a housing including an opening;
• an electronic component in the housing;
• a plurality of electrical wires connected to the electronic component and extending out of the housing through the opening;
• a plug extending in a first direction and inserted in the opening with the plurality of electrical wires passing through the opening;
• and
• a waterproofing material in the opening;
• wherein
• the plug includes a first outer peripheral surface matching an inner wall surface of the opening, and a second outer peripheral surface opposite and spaced apart from the inner wall surface of the opening;
• the plurality of electrical wires are between the second outer peripheral surface and the inner wall surface of the opening;
• the plug has a center axis extending parallel or substantially parallel to the first direction;
• the first outer peripheral surface has, in a cross-section thereof perpendicular to the first direction, a first arc shape extending around the center axis;
• the plug is shaped such that in the cross-section, a sector whose central angle has a vertex at the center axis and whose radius has a first length, and a circle whose center is located at the center axis and whose radius has a second length which is shorter than first length, overlap each other;
• and
• in the cross-section, a space having an annular sector shape is provided between the plug and the opening, and the electrical wires are accommodated in the annular sector space.

An electrical apparatus comprising:

• a housing including an opening;
• an electronic component in the housing;
• a plurality of electrical wires connected to the electronic component and extending out of the housing through the opening;
• a plug extending in a first direction and inserted in the opening with the plurality of electrical wires passing through the opening;
• a waterproofing material in the opening;
• and
• a binder to bind the plurality of electrical wires and the plug;
• wherein
• the plug includes a first outer peripheral surface matching an inner wall surface of the opening, and a second outer peripheral surface opposite and spaced apart from the inner wall surface of the opening;
• the plurality of electrical wires are between the second outer peripheral surface and the inner wall surface of the opening;
• the plug further includes a flange that extends from a first end portion in the first direction of the first outer peripheral surface in a direction intersecting with the first direction;
• and
• the binder is located between the opening and the flange.

An electrical apparatus comprising:

• a housing including an opening;
• an electronic component in the housing;
• a plurality of electrical wires connected to the electronic component and extending out of the housing through the opening;
• a plug extending in a first direction and inserted in the opening with the plurality of electrical wires passing through the opening;
• and
• a waterproofing material in the opening;
• wherein
• the plug includes a first outer peripheral surface matching an inner wall surface of the opening, and a second outer peripheral surface opposite and spaced apart from the inner wall surface of the opening;
• the plurality of electrical wires are between the second outer peripheral surface and the inner wall surface of the opening;
• and
• the electrical apparatus is an operation board provided on a handlebar of the electric power assisted bicycle, and operable to receive an operation performed by a user of the electric power assisted bicycle.

A plug to be inserted together with a plurality of electrical wires in an opening of a housing of an electrical apparatus, wherein in a cross-section, a space having an annular sector shape is provided between the plug and the opening, and the electrical wires are accommodated in the annular sector space, the plug comprising:

• a body extending in a first direction;
• wherein
• the body includes:
• a center axis parallel to the first direction;
• a first outer peripheral surface having, in a cross-section thereof perpendicular to the first direction, a first arc shape extending around the center axis;
• a second outer peripheral surface having, in the cross-section thereof perpendicular to the first direction, a second arc shape that is convex and extending around the center axis;
• and a third outer peripheral surface linking the first outer peripheral surface and the second outer peripheral surface together;
• a distance between the center axis and the second outer peripheral surface is shorter than a distance between the center axis and the first outer peripheral surface;
• and in the cross-section, a center point along the second convex arc shape of the second outer peripheral surface is located on an opposite side of the center axis from a center point along the first arc shape of the first outer peripheral surface.