Passage des gaines techniques (eaux, électricité, téléphone et évacuation des eaux usées).
La norme NF P 98-331
Selon la norme NF P 98-331, les profondeurs minimales à respecter sont de 80 cm pour les canalisations de plus de 4 bar de pression ainsi que pour celles sous chaussée. Elles sont de 70 cm pour les canalisations sous trottoir de moins de 4 bar.
Les installations souterraines doivent être marquées conformément au code de couleur désigné dans la norme NF P 98-332 :
Couleur du marquage
Nature des réseaux
Rouge
Electricité BT, HTA ou HTB, éclairage ; Feux tricolores et Signalisation routière.
Jaune
Gaz combustible (transport ou distribution) et Hydrocarbures.
Orange
Produits chimiques.
Bleu
Eau potable.
Marron
Assainissement et Pluvial.
Violet
Chauffage et climatisation.
Vert
Télécommunications ; Feux tricolores et Signalisation routière TBT.
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