A method for producing the conveyor assembly is also provided. In one method embodiment, the present invention receives a machine readable indicia wherein at least a first portion of the machine readable indicia pertains to the product identifier and at least a second portion of the machine readable indicia pertains to the user identifier. The interlock has a second position that allows connection of the other of the utility power and generator power and prevents connection of one of the utility power and generator power to the electrical panel.