Undertakings and establishments which are not covered by an autonomous occupational health and prevention service pursuant to section 2 shall organise or join an inter-company occupational health and prevention service.
However, a company or establishment, regardless of its workforce, may have its employees monitored by a company occupational health and prevention service in the following cases:
1° The company or establishment belongs to a group within the meaning of article L. 2331-1 ;
2° The company or establishment regularly works as an external company for a company, under the conditions provided for in article R. 4511-1.
In the cases provided for in 1° and 2°, an agreement is concluded between the undertaking which has organised the occupational health and safety service and the undertaking or establishment concerned. The works council of the undertaking or establishment concerned, which has been consulted beforehand, may object. Reasons must be given for objecting.