A metering assembly, switchboard case, adapter cradle and method of use are provided. A metering assembly of the present disclosure includes an intelligent electronic device (IED) disposed in a switchboard case. The switchboard case includes an enclosure which is connected to an electrical distribution system and a cover. The IED is mounted in a cradle which is removable from the enclosure. The cradle, or adaptor, interconnects electronics of the IED with an electrical circuit of the electrical distribution system. The cover includes a sealing mechanism which prevents removal of the cover and indicates when the cover has been tampered with. The cover further includes a sealed input/output interface which interconnects with input/output means of the IED disposed with the switchboard case. The enclosure and/or the cover have a gasket to seal the cover to the enclosure to making the switchboard case water-tight and enabled for used in outdoor applications.