A housing construction set for electrical devices, comprising: - a housing basic body having a number of installation openings; and - a number of installation plates (301 - 306), wherein at least one installation plate is adapted to be suitable for mounting at least one plug-in device; and/or at least one installation plate is at least partially made of transparent material; and/or at least one installation plate (301, 302, 303) is completely closed; and/or at least one installation plate (304, 305) has ventilation passages; and/or at least one installation plate has a frame on which an operating flap is pivotably mounted by means of a hinge joint; - wherein a first coding means is formed at each installation opening (101 - 110) and a second coding means is formed on each installation plate (301 - 306); characterized in that - each first coding means of an installation opening (101 - 110) has a first coding that is unique in the housing construction set, and each second coding means of an installation plate (301 - 306) has a second coding that is unique in the housing construction set, such that - each second coding means of an installation plate (301 - 306) in the housing construction set is designed to be complementary to not more than a single first coding means of an installation opening (101 - 110); and - at least in the housing construction set, each second coding means of an installation plate that is at least partially made of transparent material is designed to be complementary to a first coding means of a different installation opening (101 - 110) than each second coding means of an installation plate that is designed to be suitable for mounting at least one plug-in device. - a housing basic body having a number of installation openings; and - a number of installation plates (301 - 306), wherein at least one installation plate is adapted to be suitable for mounting at least one plug-in device; and/or at least one installation plate is at least partially made of transparent material; and/or at least one installation plate (301, 302, 303) is completely closed; and/or at least one installation plate (304, 305) has ventilation passages; and/or at least one installation plate has a frame on which an operating flap is pivotably mounted by means of a hinge joint; at least one installation plate is adapted to be suitable for mounting at least one plug-in device; and/or at least one installation plate is at least partially made of transparent material; and/or at least one installation plate (301, 302, 303) is completely closed; and/or at least one installation plate (304, 305) has ventilation passages; and/or at least one installation plate has a frame on which an operating flap is pivotably mounted by means of a hinge joint; - wherein a first coding means is formed at each installation opening (101 - 110) and a second coding means is formed on each installation plate (301 - 306); characterized in that - each first coding means of an installation opening (101 - 110) has a first coding that is unique in the housing construction set, and each second coding means of an installation plate (301 - 306) has a second coding that is unique in the housing construction set, such that - each second coding means of an installation plate (301 - 306) in the housing construction set is designed to be complementary to not more than a single first coding means of an installation opening (101 - 110); and - at least in the housing construction set, each second coding means of an installation plate that is at least partially made of transparent material is designed to be complementary to a first coding means of a different installation opening (101 - 110) than each second coding means of an installation plate that is designed to be suitable for mounting at least one plug-in device.