The outlet is keyed for proper orientation. The installer just needs to know where that key belongs along the circumference of the plug. A sparky would know that but maybe so should an assembly line worker as well if trained or shown during training.
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SOB
2015 Volvo VNL780 D13, iShift, 32k ET air hitch, Idle Free LiFePO4 APU
16.8KWhr LiFePO4, 2.52 kw solar, 10kva Victron split phase
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