Meltric color codes their Plugs and receptacles based on voltage and pin combination.
Both the inlet and receptacle have the color coding for visual indication that the plugs go together add all as being pinned the same.
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1 pole 1 neutral and1 ground - 1P+N+G
110-125 volts 60 Hz ORANGE
120-127 volts 60 Hz YELLOW
255-277 volts 60 Hz GREY
347 volts 60 Hz RED
Two Poles and 1 Ground - 2P+G
208-220 volts 60 Hz BLUE
220-250 volts 60 Hz ORANGE
440-480 volts 60 Hz RED
600 volts 60 Hz BLACK
Two Poles Neutral and 1 Ground - 2P+N+G
110-125 volts 60 Hz ORANGE
220-250 volts 60 Hz ORANGE
208-220 volts 60 Hz BLUE
255-277 volts 60 Hz RED
440-480 volts 60 Hz RED
347-600 volts 60 Hz BLACK
Three Poles and One Ground - 3P+G
208-220 volts 60 Hz BLUE
220-250 volts 60 Hz ORANGE
440-480 volts 60 Hz RED
600 volts 60 Hz BLACK
Three Poles, One Neutral and One Ground - 3P+N+G
110-125 volts 60 Hz ORANGE
220-250 volts 60 Hz ORANGE
120-127 volts 60 Hz BLUE
208-220 volts 60 Hz BLUE
255-277 volts 60 Hz RED
440-480 volts 60 Hz RED
347-600 volts 60 Hz BLACK