The spacer allows the lateral entry of cables through the use of cable glands, for surface-mounted systems and the installation of conventional and addressable sensors, conventional sounders (Art. 48SAI020, 48SCI040, 48SCI060), addressable sounders (41SCI000 and 41SAI000) and bases with addressable sounders (Art. 41SCB100 and 41SAB100), even on rough surfaces, false ceilings, etc.