Journeyman Electrician Exam (NEC)Wiring Methods and MaterialsEasy
A maintenance technician is replacing a flexible cord on a portable 277-volt industrial machine. The machine requires a grounding conductor. According to NEC 400.22(B), what is the color that must be used for the grounding conductor in a flexible cord?
- ARed
- BWhite or Gray
- CBlack
- DGreen or Green with Yellow Stripes
Show answer & explanationAnswer & explanation
Correct answer: D. Green or Green with Yellow Stripes
NEC Section 400.22(B) explicitly states that the grounding conductor in a flexible cord shall be identified by a continuous outer finish of green or green with one or more yellow stripes.
Why the other options are wrong
- A. This color is typically used for ungrounded (hot) conductors.
- B. These colors are for grounded (neutral) conductors.
- C. This color is typically used for ungrounded (hot) conductors.
Flexible Cord Grounding Color
The standardized color identification for the equipment grounding conductor within a flexible cord.
- Ensures proper identification of the grounding path.
- Critical for safety and preventing electrical shock.
- Consistent across flexible cords.
Memory trick: Green means ground, safe and sound.