NBN C 51-105-1987 Rotating electrical appliances, classifications with different degrees of protection caused by different packaging of rotating electrical appliances
1987NBN C 51-105-1987 Rotating electrical appliances, classifications with different degrees of protection caused by different packaging of rotating electrical appliances
1978NBN C 51-105-1978 Rotating electrical appliances, the degree of protection caused by different packaging of rotating electrical appliances