Type G-GC Heavy Duty Flexible Power Cables are engineered for hard service applications in mining, industry, and portable power applications. They are flexible, water and flame resistant, and resistant to ozone, grease, and chemicals. Used in a variety of applications, they are the go to choice when you need a rugged, heavy duty power supply cord. Type G-GC Cables have three phase conductors, 2 ground wires and a yellow pilot or ground check wire. In mining use, the pilot wire is used to check the continuity of the grounding system, to prevent accidents. They are UL Listed and MSHA approved and rated 2000 Volts 90C