Hunzenschwil manufacturer of cable glands, boxes and installation systems, part of the Kaiser group, holding three live VKF recognitions in Untergruppe 223 Abschottungen/Durchführungen — 25347, 25348 and 25349 — for firestop-rated electrical penetrations. Electrical boxes and cable entries through a rated wall are a routine compartmentation defect; these are the approved Swiss details for closing them.