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new 220v 4 wire to an older 3 wire socket
need to hook up a convection oven
it has a 4 wire plug so I bought a 4 wire socket
but my house is old 3 wire 220v
now what do I use the metal shell of the socket and box pipes ect as #4
or do I need a new 4th wire run from the main breaker box ? or elsewhere ?
I think #4 wire is ground not neutral for 220v return from the 2 110 lines =220
so the box pipes ect is the ground with two existing hot wires and a return wire ?
but is anything else needed at the main or do I need a 4th wire run in and not use the box pipes ect ground ?
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