An apparatus for supporting an underground main service entrance device and at least one secondary service entrance device and a kit for assembling such apparatus are disclosed. A preferred embodiment of such an apparatus comprises metal posts, metal bars, a first enclosure, at least one second enclosure, and at least one enclosure-connecting conduit. The bars of the embodiment are preferably coupled to the posts horizontally. The preferred first enclosure is configured to contain a main service entrance device. The preferred second enclosure is configured to contain a secondary service entrance device. The first enclosure is preferably attached to two of the bars near the top while the second enclosure is preferably attached to at least one of the bars below the first enclosure. The first and second enclosures are connected by the enclosure-connecting conduit. The components of the embodiment are preferably removably coupled and may be reconfigured when needed.