Method for producing an industrial vehicle for the transport of people comprising the following phases: a) building a number of modules each of which is made with metallic tubes interconnected; b) realizing in each module at least one spot by depositing over the external surface of a metallic tube a layer of metallic protecting paint or applying an adhesive protecting tab to the surface of the metallic tubes; c) subjecting the modules provided with spots to a cathaporesis treatment bath so that a protecting insulating layer is deposited to cover the external surfaces of the modules except the areas where spots are realized according to where the insulating layer does not adhere in order to create a contact portion that is free from the protecting insulating layer; d) for the case in which the at least one spot is realized according to by applying an adhesive protecting tab to the surface of the tubes, subjecting the modules provided with spots to a cathaporesis treatment bath so that a protecting insulating layer is deposited to cover the external surfaces of the modules and detaching the adhesive protecting tab to uncover the metallic surface of the tube that in that area is not covered with the insulating layer in order to create a contact portion that is free from the protecting insulating layer; e) after the cathaporesis treatment, connecting the modules one with the other over a basis provided with wheels to realize a chassis of the vehicle; f) subsequently depositing a continuous layer of an electrically conductive paint over one portion of the chassis to cover the contact portions that realize contact elements electrically interconnecting the modules one with the other through the continuous layer thus realizing a ribbon shaped layer extending over surfaces of the chassis and facing the outside of the chassis itself for connecting all spots and establishing a common voltage for all modules; wherein said electrically conductive paint is a paint with a single component charged with a conductive powder; g) covering the chassis with a number of vehicle body modules; every vehicle body module has a surface that is covered with said electrically conductive paint; said surface covered with said electrically conductive paint has at least a portion facing the chassis and resting against the continuous layer when the vehicle body module is stably connected to the chassis so that an electric connection is established among the modules and the body modules. a) building a number of modules each of which is made with metallic tubes interconnected; b) realizing in each module at least one spot by depositing over the external surface of a metallic tube a layer of metallic protecting paint or applying an adhesive protecting tab to the surface of the metallic tubes; c) subjecting the modules provided with spots to a cathaporesis treatment bath so that a protecting insulating layer is deposited to cover the external surfaces of the modules except the areas where spots are realized according to where the insulating layer does not adhere in order to create a contact portion that is free from the protecting insulating layer; d) for the case in which the at least one spot is realized according to by applying an adhesive protecting tab to the surface of the tubes, subjecting the modules provided with spots to a cathaporesis treatment bath so that a protecting insulating layer is deposited to cover the external surfaces of the modules and detaching the adhesive protecting tab to uncover the metallic surface of the tube that in that area is not covered with the insulating layer in order to create a contact portion that is free from the protecting insulating layer; e) after the cathaporesis treatment, connecting the modules one with the other over a basis provided with wheels to realize a chassis of the vehicle; f) subsequently depositing a continuous layer of an electrically conductive paint over one portion of the chassis to cover the contact portions that realize contact elements electrically interconnecting the modules one with the other through the continuous layer thus realizing a ribbon shaped layer extending over surfaces of the chassis and facing the outside of the chassis itself for connecting all spots and establishing a common voltage for all modules; wherein said electrically conductive paint is a paint with a single component charged with a conductive powder; g) covering the chassis with a number of vehicle body modules; every vehicle body module has a surface that is covered with said electrically conductive paint; said surface covered with said electrically conductive paint has at least a portion facing the chassis and resting against the continuous layer when the vehicle body module is stably connected to the chassis so that an electric connection is established among the modules and the body modules.