From tables provided in this chapter, identify the NEMA designation for the following grounding-type devices requiring a 20 A, 250 V four-pole, four-wire, three-phase rating:
a. Receptacle
b. Plug

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TABLE 18.5 CONFIGURATION FOR NONLOCKING RECEPTACLES AND PLUGS. Number/Type of Conducting Poles Receptacle (R) and Plug (P) Ratings and NEMA Designations System Voltage Rating Ungrounded Grounded (Neutral) Grounding 15 A 20 A 30 A 50 A 60 A 1-15R 125 1 1 - Two pole, two wire 1-15P 2-20R 2-30R 250 2 - - 2-20P 2-30P 5-15R 5-20R 5-30R 5-50R Two pole, 125 1 1 5-15P 5-20P 5-30P 5-50P three wire, grounding 6-15R 6-20R 6-30R 6-50R 250 2 - 1 6-15P 6-20P 6-30P 6-50P 7-15R 7-20R 7-30R 7-50R 277 1 1 1 7-15P 7-20P 7-30P 7-50P Three pole, 10-20R 10-30R 10-50R three wire 125/250, 1 2 1 - 10-20P 10-30P 10-50P 11-15R 11-20R 11-30R 11-50R 250, 3 - - 11-15P 11-20P 11-30P 11-50P 14-15R 14-20R 14-30R 14-50R 14-60R Three pole, 125/250, 1 2 1 1 14-15P 14-20P 14-30P 14-50P 14-60P three wire, grounding 15-15R 15-20R 15-30R 15-50R 15-60R 250A, 30 3 - 1 15-15P 15-20P 15-30P 15-50P 15-60P 18-15R 18-20R 18-30R 18-50R 18-60R Four pole, 208Y/120, 3 3 1 0 four wire 18-15P 18-20P 18-30P 18-50P 18-60P