An electrical assembly having a support, a mounting member and an electrical device attached to the mounting member and the support. The mounting member is a one piece integrally formed unit having an interior cavity for receiving electrical wires from the power source and supplying the electrical wires to the electrical device. The mounting member has a coupling at a first end of the mounting member with internal threads having an annular recess receiving a seal member for forming a weatherproof seal with the support while allowing limited rotational adjustment of the mounting member with the support and maintaining the weatherproof seal. The mounting member has a second end with a coupling having external threads complementing the internal threads of the first coupling to enable a plurality of the mounting members to be coupled together and forming a weatherproof connection between the adjacent mounting members.