Abstract: A double-sided multi-socket adapter panel whose plugging sockets alternate between two opposite sides of the adapter panel such that some of the sockets are separated further apart so that even large-size plug of a transformer adapter can be accommodated without affecting the availability of neighboring plugging sockets. The electrode-plugging slots are aligned along a straight line parallel to the general layout direction of the plugging sockets, and therefore suitable for plugging vertical plugging head. Furthermore, each plugging socket has a protective cover capable of sliding so that whenever a plugging socket is unused, the plugging slots of the socket can be shut to prevent dust from entering or any accidental touching by somebody. The conductive electrode structures are designed such that the optimal number of plugging sockets and distance of separation between two sockets are obtained.