ISO 5149-3:2014适用于安装现场（厂房和设施）。它规定了现场的安全要求，这可能是由于制冷系统及其辅助部件而需要的，但不是与之直接相关的。 ISO 5149-3:2014适用于新的制冷系统、现有系统的扩展或修改，以及转移到另一现场并在另一现场运行的旧系统。它也适用于系统转换为另一种制冷剂的情况。

ISO 5149-3:2014 is applicable to the installation site (plant space and services). It specifies requirements for the site for safety, which could be needed because of, but not directly connected with, the refrigerating system and its ancillary components. ISO 5149-3:2014 is applicable to new refrigerating systems, extensions or modifications of existing systems, and for used systems being transferred to and operated on another site. It also applies in the case of the conversion of a system for another refrigerant.