It's hard to tell the size, which is the difference between the L5-20 and L6-50. If you have a voltmeter and feel comfortable using it, check the voltage across the two non-ground wires. L5-20 = 120V L6-50 -240V.
Also, the L5-20 is the size of a standard 120V plug, the L6-50 is the size of the 14-50.
What is it labeled as on the circuit breaker, and is the circuit breaker a single or dual?
Next, can you figure out the gauge of the wire connected to it?
If you can follow it back to the sheathing, it should have 12, 10, 8, or 6 gauge stamped on it somewhere.
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