Industrial extension cord grounding system describes:

Industrial extension cord grounding system describes:

• A. A 3 prong plug with grounding prong
• B. Insulation
• C. Circuit wires
• D. A third wire in the cord to ground

Answer: (D)

Grounding in an industrial extension cord is provided by a dedicated third conductor inside the cord that serves as the ground path. This grounding wire connects to the equipment grounding system and to earth, giving fault current a low-resistance path back to the panel so protective devices trip and prevent shock if a fault energizes a metal case. A three-prong plug indicates the presence of grounding, but the actual grounding system is the separate ground conductor inside the cord, not just the plug design. Insulation and the other wires (hot and neutral) play roles in preventing contact and carrying current, but they do not establish a grounding path.

Grounding in an industrial extension cord is provided by a dedicated third conductor inside the cord that serves as the ground path. This grounding wire connects to the equipment grounding system and to earth, giving fault current a low-resistance path back to the panel so protective devices trip and prevent shock if a fault energizes a metal case. A three-prong plug indicates the presence of grounding, but the actual grounding system is the separate ground conductor inside the cord, not just the plug design. Insulation and the other wires (hot and neutral) play roles in preventing contact and carrying current, but they do not establish a grounding path.