Connector housing and method of assembling connector

A connector housing moulded as one body, said connector housing comprising:

• a rectangular box-shaped housing body having upper and lower walls provided with upper and lower openings, respectively, through which wires are to be installed in said housing body;
• a cover for closing said upper and lower openings, said cover having an upper plate for closing said upper opening, a lower plate for closing said lower opening and a lateral plate for connecting said upper plate with said lower plate, thereby to have a substantially C-shaped cross section;
• a temporary connecting piece for temporarily connecting said cover with said housing body;
• and
• a locking device locking said cover on said housing body after disconnection of said cover from said housing body by disconnection of said temporary connecting piece, and after said cover is slidably attached to said housing body such that said openings are closed, said locking device being arranged in said housing body and said cover,
• wherein said housing body is configured to guide the sliding movement of said cover in closing said openings.