Description: operating time of the product from the commencement of its usage to the first failure ; Name: operating time until failure
Description: Operating time accumulated from the first use, or from restoration, until failure ; Name: Operating time to failure
Description: extent of protection provided by an enclosure against access to hazardous parts, against ingress of solid foreign objects and/or ingress of water and verified by standardized test methods, expressed as a IP rating; Name: degree of protection