Cover for an electronic equipment, which cover includes a first and a second metal panel element, wherein respective first and second metal surface of the panel element are mechanically joined together with electrical contact using a connector including a contacting device. The contacting device includes a) an elongated, wave-shaped metal compression spring part with a direction of elongation and a direction of motion, where the spring part is compressed between the two respective metal surfaces against the spring force; b) a hook part on the spring part, gripping around an edge of the first panel element; and c) at least one projection, on a surface facing towards the first metal surface when the hook part grips around the edge, which projection is arranged to display different sliding friction against the first metal surface depending on in which direction the spring part is caused to slide against the first metal surface.