How to Wire a 3-Phase, 60A – 120/208V NEMA 18-60 Receptacle
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10 Questions
Question 1 of 10
What is the primary configuration of a NEMA 18-60 receptacle regarding grounding?
The NEMA 18-60 is defined as a 4-pole, 4-wire non-grounding receptacle.
Question 2 of 10
Which terminal on the NEMA 18-60 receptacle is designated for the neutral conductor?
The W terminal (vertical slot) with a silver screw is used for the neutral connection.
Question 3 of 10
What is the correct voltage measurement between any Line (hot) and Neutral in this system?
In a 120/208V 3-phase Wye system, the line-to-neutral voltage is approximately 120V.
Question 4 of 10
What is the recommended copper conductor size for the three hot wires of a 60A NEMA 18-60 circuit?
The article specifies using #4 to #6 AWG copper conductors for the phase wires.
Question 5 of 10
When installing a 3-pole GFCI breaker for this receptacle, where is the white pigtail connected?
The GFCI white pigtail must be connected to the neutral busbar in the main panel.
Question 6 of 10
How should the equipment grounding conductor (EGC) be handled at the NEMA 18-60 receptacle?
As a non-grounding type receptacle, the EGC must not be connected to the device itself.
Question 7 of 10
What is the required torque specification for the NEMA 18-60 terminal screws?
The article specifies a torque of approximately 25 in.-lb (3 N·m) for the terminals.
Question 8 of 10
Which terminal corresponds to the horizontal slot on the NEMA 18-60 receptacle?
The Z terminal is identified by the horizontal slot and connects to Hot 3 (L3).
Question 9 of 10
What is the appropriate enclosure type for outdoor installations of the NEMA 18-60?
The article specifies a 2-gang outdoor box with a NEMA 3R rainproof enclosure.
Question 10 of 10
What is the purpose of the neutral conductor in this specific 3-phase system?
The neutral is required because the system supports both line-to-line and line-to-neutral loads.
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