Can I convert NEMA 10-30R 3-Wire to Tesla 30-Amp, 250V 4-Wire

No NEMA 10. IF you actually have Hot, Hot, Ground, use NEMA6, properly. NEMA 10 is obsolete and dangerous. NEMA6-30 or L6-30 are common as dirt. See this recent question, or a bunch of older ones.

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Bob Lin

Bob Lin, MS-MVP, MCSE & CNE Data recovery, Windows OS Recovery, Networking, and Computer Troubleshooting on http://www.ChicagoTech.net How to Install and Configure Windows, VMware, Virtualization and Cisco on http://www.HowToNetworking.com