What electrical power supply does the HBL5751UC require?
The HBL5751UC requires a 40-amp, 4-wire single-phase AC power supply rated at either 208V or 240V, 60 Hz. The four-wire connection is preferred, but where local codes permit, a three-wire connection is also acceptable. The outlet must be properly grounded in accordance with all applicable codes. (Page 10)
From the official Bosch HBL5751UC Oven manual, page 10
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