A housing for a device an outside and an inside, as well as an access passage for access from the outside of the housing to a component of the device inside the housing. The access passage comprises an outer opening section, and an inner drainage channel. The drainage channel is arranged below the outer opening section, which has vertical side walls extending inwardly from the outside of the housing. Each sidewall has a top width (WT) and a bottom width (WB), the top width (WT) being narrower than the bottom width (WB). The sidewalls provide a guiding surface for a liquid entering the access passage, such that the liquid is guided towards the drainage channel.