Abstract: A modular retainer assembly for electrical cables is disclosed. The modular retainer assembly includes a base having an upper surface and a lower surface. The upper and lower surfaces of the base define a thickness of the base therebetween. The modular retainer assembly also includes a plurality of divider walls projected outwardly from the upper surface of the base. Each divider wall of the plurality of divider walls define a channel disposed between the divider wall and an adjacent divider wall. Also, each divider wall has a curved profile along a length of each divider wall. Further, a cross section of each divider wall defines a top portion thickness and a bottom portion thickness, the bottom portion thickness of the divider wall being less than the top portion thickness of the divider wall measured at the cross section of the divider wall.