Describes the environmental conditions to which a product not forming part of the vehicle is subjected when installed in a ground vehicle. Such products are for example radios, communication systems, fare meters and flow meters for liquids. Vehicles include road vehicles, rail vehicles, overland vehicles, handling and storage vehicles, and self-propelled machinery. Only severe conditions which may be harmful to products are included. BS AMD 7956 RENUMBERS THIS STANDARD TO BS EN 60721-3-5