Single-point socket boxes are installed in a row according to a marking template, while the interaxial distance should be 71 mm; in this case, electrical installation products with a common frame can be mounted in them without any problems.
In two- and three-gang socket boxes, the center-to-center distance is 71 mm, this makes it possible to mount electrical installation products in them with a common frame.
The distance between the mounting holes is 60 mm - suitable for most electrical installation products of Russian or European standards.