Hi LARRY,
I appreciate you reaching out regarding your Samsung - 6.3 cu. ft. Freestanding Electric Range with Rapid Boil™, WiFi & Self Clean if you need to use a 3 prong or 4 prong. Regarding your concern you must use a 3-wire or 4-wire, single-phase A.C. 208Y/120 Volt or 240/120 Volt, 60 hertz electrical system.
I am sharing to you the link to your installation guide. Please go to page 2 and 3
https://www.samsung.com/us/support/downloads/?model=N0020399&modelCode=NE63A6311SS/AA
Should you need more assistance, please feel free to get back to us via the following options:
1. Facebook Messenger: http://m.me/samsungsupport
2. Twitter: https://twitter.com/messages/compose?recipient_id=18768513
3. Samsung Community: https://us.community.samsung.com/t5/Samsung-Community/ct-p/us
Thank you for being a valued customer of Samsung. Have a great day.
Reference Ticket Number: 1144173113
^Camille