Position of ground contact with respect to major for various voltages and frequencies, designated by Clock face positions in accordance with table 104 taken EN 60309 - 2 : 1992These markings are easily visible on plugs and Sockets after installation and connection and when in service as prescribed by the manufacturer:
Member Since 18 Years
Nature of Business Retailer
For Buyer 
For Seller 
Help 
Ambattur, Chennai, Tamil Nadu