A low voltage electrical distribution installation including at least one busbar linked to a power supply bus or to an upstream protection switchgear, and to switchgears of an electrical equipment item, this installation includes, for each of at least two bars, an insulating support configured to house the bar over substantially all of its length, each insulating support including a device for fixing to another insulating support adjacent to the first, each insulating support situated at the end of a group of insulating supports being configured to be fixed to at least one upright belonging to a device housing the switchgears, via at least one crossmember extending substantially at right angles to the longitudinal direction of the corresponding bar, at least one crossmember being fixed to the upright(s), and to the insulating support such that the assembly including the upright(s), the crossmember(s) and the insulating supports housing the bars, forms a rigid assembly.