System comprising an electrical installation box and a support member attached to said electrical installation box for flush mounting on a wallboard , said support member comprising: - a rear surface removably attached with the electrical installation box ; - a front surface to be fixedly attached with the wallboard ; and - a central cavity of matching profile with entry portion of the electrical installation box , said front surface and rear surface are extended outwardly about said central cavity , wherein said rear surface comprises: - at least a set of fixing members (102-1,102-2) disposed about said central cavity and extending from said rear surface to removably attach with the electrical installation box ; - at least a set of guiding members disposed about said central cavity for aligning said fixing members (102-1,102-2) with said electrical installation box ; and - at least a receiving provision which receives a split nut assembly , and wherein said front surface comprises: - at least a set of releasing slots (108-1, 108-2) disposed opposite to every fixing member (102-1,102-2) on said rear surface such that said releasing slots (108-1, 108-2) extend up to said rear surface to release said fixing members (102-1,102-2) from the electrical installation box ; - the split nut assembly which has clipping members ; and - at least a fastener aligning slot to guide fasteners into said split nut assembly , said at least a fastener aligning slot is disposed opposite to said at least a receiving provisions for receiving the split nut assembly of said rear surface . - a rear surface removably attached with the electrical installation box ; - a front surface to be fixedly attached with the wallboard ; and - a central cavity of matching profile with entry portion of the electrical installation box , said front surface and rear surface are extended outwardly about said central cavity , - at least a set of fixing members (102-1,102-2) disposed about said central cavity and extending from said rear surface to removably attach with the electrical installation box ; - at least a set of guiding members disposed about said central cavity for aligning said fixing members (102-1,102-2) with said electrical installation box ; and - at least a receiving provision which receives a split nut assembly , and wherein said front surface comprises: - at least a set of releasing slots (108-1, 108-2) disposed opposite to every fixing member (102-1,102-2) on said rear surface such that said releasing slots (108-1, 108-2) extend up to said rear surface to release said fixing members (102-1,102-2) from the electrical installation box ; - the split nut assembly which has clipping members ; and - at least a fastener aligning slot to guide fasteners into said split nut assembly , said at least a fastener aligning slot is disposed opposite to said at least a receiving provisions for receiving the split nut assembly of said rear surface . - at least a set of releasing slots (108-1, 108-2) disposed opposite to every fixing member (102-1,102-2) on said rear surface such that said releasing slots (108-1, 108-2) extend up to said rear surface to release said fixing members (102-1,102-2) from the electrical installation box ; - the split nut assembly which has clipping members ; and - at least a fastener aligning slot to guide fasteners into said split nut assembly , said at least a fastener aligning slot is disposed opposite to said at least a receiving provisions for receiving the split nut assembly of said rear surface . <EOS>