the module support 100 to a complementary sub module 220 210 already installed on the module support 100 to furnish this connection these electrical connectors 217 218 are complementary to electrical connectors 217 218 of the complementary sub module 220 210 to allow the connection by the mounting on the module support 100 as shows on fig1 and 2 the electrical device sub module 210 comprises six female connectors 217 and one male connector 218 of the snap on type in the same way the front end sub module comprises six male connectors and one female connector of the snap on type which are not show on the figure the six male connectors and the one female connector of the front end sub module 220 are arranged in such way they are facing a complementary connector 217 218 of the electrical device sub module 210 when both sub modules 210 220 are mounted on the module support 100 to form a module 200 the module 200 shows on fig1 also comprises an installation jig 230 for guiding the front end sub module when it is mounted on the module support 100 the module support 100 together with at least two modules form an assembly of modules 10 such assembly of modules 10 can be mounted by using a mounting method that comprises the following steps furnishing the module support 100 and at least two.