A number of different types of cables are used in mines. There are fixed mining cables and portable mining cables, the latter being described here.
The key requirements of portable cables are flexibility, and resistance to mechanical abrasion and damage. Due to the additional demands put on portable mining cables used for reeling and dereeling applications, special design may be required.
There are many types of portable mining cables. They are available in ratings up to 25 kV, and may have as many as five conductors. An example of SHD-GC Cable, is shown in the illustration. It has three insulated, shielded conductors, two bare ground wires, a ground check wire, and an overall jacket. The conductors for this cable are annealed, bare or tinned copper wires. The braided shield may be tin-coated wires, or a tin-coated copper wire/textile composite.
The grounding conductor(s) annealed, bare or tinned, stranded copper wires, and the ground check conductor is annealed, bare, stranded copper wires with EPR insulation and nylon braid, elastomeric jacket holds the conductor assembly firmly in place, to minimize snaking and cork-screwing during reeling and dereeling.
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