Abstract: A corner assembling system includes at least one coupling indent ensuring not opening of the coupling curve, at least one exterior surface support indent providing resistance and support to the front exterior surface, and a grounding tab increasing the grounding integrity of aluminium corner assembling member. A vertical profile interior tightening and connecting piece fixes the vertical profile to the aluminium corner assembling member from inside. A horizontal profile interior tightening and connecting piece fixes the horizontal profiles to both aluminium corner assembling member and to one another from inside. The system provides for assembling of power distribution panels, boxes and rectangular frame construction profiles with one another without a welding.