This standard applies to conversion adaptors intended mainly for industrial use, comprising a housing of insulating material which incorporates an industrial 2P + , 16 A, 6 h 250 V~ type plug part (Table 104 in standard EN 60309-2) and one or two socket-outlets in accordance with the relevant national standards for socketoutlets for household and similar use, with a rated current up to 16 A, intended mainly for industrial use either indoors or outdoors. Adaptors can be used in conjunction with socket-outlets and/or connectors This standard applies to all applications where the ambient temperature does not normally exceed 40 °C. The use of these adaptors on