noyau

CONT: Les noyaux (dits aussi cœurs techniques) distribuent sur la hauteur d'un niveau l'ensemble des fluides d'un bâtiment : alimentation en eau, évacuations, tuyauteries de vide-ordures, gaines d'aération contrôlée, distribution électrique, gaines de gaz, colonnes de chauffage, câbles téléphoniques et de télévision, fluides spéciaux, etc. [...]

CONT: A set of prefabricated elements ... has had impact of various degrees upon prefabrication. The most important of these is the utility core in which kitchen, bath, and laundry are arranged along opposite sides of a common wall containing electric power, water, and drainage.
OBS: The terms ""sanitary core"" and ""plumbing services"" are given as synonyms of ""mechanical core"" by SCOBU (A dictionary of building), but actually they are more specific in scope.