A clock face is used to represent the grounding contact position for all female connectors and receptacles. With the keyway at the bottom, the female grounding contact will appear at one of the twelve hour positions. To identify the system voltage, identify the housing color and hour location of the connector or receptacle grounding contact.

ME Prefix	4 1st Digit	20 2nd-4th Digit	R 1st Letter	7 Last Digit	W* Last Letter
ME = MENNEKES	3 = 3 wire 4 = 4 wire 5 = 5 wire	20 = 20 Amp 30 = 30 Amp 60 = 60 Amp 100= 100 Amp	P = Plug C = Connector R = Receptacle B = Inlet Ml = Mechanical Interlock	Clock position of female grounding contact	W = Watertight