Panelboard front having concealed clamps

A panelboard comprising a box having in-turned flanges on the front edges of the walls thereof, a sub-assembly of electrical devices in the box, and a trim unit largely covering the front of the box and having a portion defining an opening for exposing the devices in the box, a door for closing said opening and covering at least a portion of the trim unit surrounding said opening, said portion of the trim unit surrounding the opening cooperating with said electrical devices so as to block access to the interior of the panelboard when the door is open, and means for securing the trim unit to the box, characterized in that:

• the securing means includes elongated clamp bars at the back of the trim unit, each clamp bar having a clamping end portion said bars being slidable longitudinally between an extended position with its clamping end portion opposite one of said flanges and a withdrawn position with its clamping end portion clear of the flange and each clamp bar having a manipulating end portion directly accessable from the front of the trim unit in both said positions of the clamp bar, said securing means also having tightening means for each clamp bar including an operating means at the front of the trim unit for tightening the clamping end portion of the clamp bar against the flange, said tightening means and the trim unit jointly supporting the elongated clamp bar and defining the path for the longitudinal movement between said extended and withdrawn positions, said door in its closed position covering said tightening means and barring access to said manipulating end portion of the clamp bar.