Abstract: An articulated wall mounted mechanical arm includes a swivel joint for attachment to a wall surface through a bracket. The swivel joint is formed with a central open-ended pass-through space which is dimensioned and configured to enable cabling (for example an electric cable) with a cable connector attached to pass through the space and enter a lengthwise extending open sided channel formed in an arm section of the mechanical arm. Removable covers and/or caps are provided selectively to close the open side of the channel and at least one open end of the pass-through space.