The internal networks mentioned in 3° of article R. 1321-43 may not, unless the Prefect grants an exemption, be supplied with water from a resource that has not been authorised in application of article L. 1321-7. They must not, as a result of the conditions in which they are used, particularly in the event of backflow, be able to disrupt the operation of the network to which they are connected or cause contamination of the water distributed to private distribution systems.
The derogation provided for in the first paragraph is not required for the application of article L. 1322-14.
An order of the ministers responsible for health and construction, issued after consultation with the Agence nationale de sécurité sanitaire de l’alimentation, de l’environnement et du travail, defines the cases in which protective devices must be installed and the technical requirements applicable to these devices. It is the responsibility of the owners of the installations to install and maintain these devices.