Abstract: A terminal box used with underground electrical conductors is formed of opposed channels and a top cap with depending sidewalls. Air is permitted to flow to the interior of the housing via a filter beneath the cap, this filter being resistant to the passage of dust, water, blowing snow and insects. A weathertight seal is provided between the opposed channels by a resilient sealing strip and overlapping vertical marginal portions; and, upward access by animals and ground moisture to the interior of the housing is deterred by a continuous barrier sheet which extends transversely across the housing and is sealed thereto.Corrosion damage to the housing is minimized by connecting it electrically to a buried plate formed of a metal which is anodic in the EMF series with respect to the housing metal. Grass fire and lawnmower-impact damage is reduced by surrounding the terminal box at ground level by a vegetation-inhibiting sheet.