Support frame (1) for wall mounting at least one electrical apparatus (20, 21, 22, 23), the frame (1) comprising: a surround casing (4) for wall fixing, enclosing an opening (5) that defines a assembly housing adapted to accepting and retaining said at least one electrical apparatus (20, 21, 22 and 23), the opening (5) being defined by a facing pair of fixing panels (6 and 7) and a facing pair of connecting panels (9 and 10) with ends attached to said fixing panels (6 and 7) and the fixing panels (6 and 7) comprising attachment elements (8) for mounting said at least one electrical apparatus (20, 21, 22 and 23). The connecting panels (9 and 10) include coupling components (11), adapted to engaging with respective complementary coupling components (12) substantially located on end sections of a divider (13) that can be removably coupled to said frame (1) to subdivide said opening.