The activities regulations § 45

§ 45 Maintenance

The responsible party shall ensure that facilities or parts thereof are maintained, so that they are capable of carrying out their required functions in all phases of their lifetime.
Section last changed: 01 January 2017

Maintenance means the combination of all technical, administrative and managerial actions during the life cycle of an item intended to retain it in, or restore it to, a state in which it can perform the required function, cf. definition 2.1 (with associated terminology) in the NS-EN 13306 standard.
Maintenance includes activities such as monitoring, inspection, testing, trial and repair, and keeping things tidy.
Functions also mean safety functions, cf. Section 3 of the Facilities Regulations. For these functions, the requirement relating to maintenance entails that performance shall be ensured at all times, cf. Section 8 of the Facilities Regulations.
Facilities or parts of facilities also mean temporary equipment.
All phases also mean periods in which the facility or parts of the facility are temporarily or permanently shut down.