One of the most popular mining cords today is Type G. Standard Type G mining cord is a bare copper cord rated at 2000 volts (2KV). Type G uses a thermoset insulation, typically EPR, and a thermoset jacket, typically CPE. In other words, it looks and feels like rubber.
Standard temperature range of a G Cord is -40C to +90C. However, there are many constructions of this product which may increase or decrease the temperature rating on the cable. All G Cords should meet the approval of MSHA- The Mine Safety and Health Administration.
There are 2 common types of G Cord. One is called G and one is called GG-C.
Type G Cord – G Cord uses 4 conductors as well as 4 grounding conductors. The 4 grounding conductors are all the same size and that can vary depending on the size of the cable. For example, a 2 AWG G Cord would consist of 4 # 2’s and 4 # 9’s. The # 9’s are the ground wires so a total of 8 conductors are found in a G cord. All conductors and grounds are insulated and color coded.
Type GG-C Cord – GG-C Cord is a 3 conductor product that uses a 3 ground system. It has two standard grounds and one smaller ground called a ground check. It is constructed with a total of 6 color coded conductors. For example, a 2 AWG G-GC Cord has 3 # 2’s, 2 #10’s and 1 #7. The #7 is the ground check. All conductors and grounds are insulated on this product as well.
There is a wide range of applications for these 3 phase alternating current carrying mining cords where grounding is required. They can be found in all types of mines on cutters, loaders, conveyors, drill and pumps. The ruggedness and flexibility allows for heavy usage where temporary or permanent flex fatigue is required.