Medium voltage cable buyers in Tennessee
The classes, constructions and reel lengths behind plant and utility distribution cable, and what decides the offer on a part reel in a stores yard.
Send us your reel list
Six details are enough for a first review: what the cable is, the metal, the size, the footage or reel count, the condition and where it sits. Photographs can follow by text or email. There is no fee and no obligation, and nothing moves until written terms are agreed.
Most shielded cable in a Tennessee plant or utility store falls in one range. It runs from 2 kV to 35 kV, it is built in the familiar classes of 5, 8, 15, 25 and 35 kV, and it feeds everything from a small motor to a substation transformer. It is the cable that leaves the switchgear and goes into the ground, the tray or the duct bank.
Because it is everywhere, it is also the most common surplus. Reels arrive from plant expansions that were cut short, from switchgear replacements, from contractor leftovers and from store stock that was bought against a project and never used. The 15 kV and 25 kV classes account for most of it, and those are the reels that move fastest.
A part reel of 15 kV cable is the most useful thing in most surplus lots.
Lot basics
- Voltage classes
- 2 kV to 35 kV
- Sizes
- 1/0 to 1,000 kcmil
- Insulation
- EPR or XLPE
- Shield
- Copper tape
Voltage classes and where each is used
The class is a statement about insulation thickness, not about the system it serves. A 15 kV cable is at home on a 13.8 kV distribution feeder with margin for switching surges, and a 25 kV cable on a 22.9 kV or 24.9 kV system. A 5 kV cable serves older 4.16 kV equipment, still common in plants of a certain age.
The 35 kV class is less common and heavier, used where a utility or large plant distributes at 34.5 kV. Each step up adds insulation wall, diameter and cost, so a 35 kV reel is a different item from a 15 kV reel of the same conductor size, even though both are described as medium voltage.
Insulation, screens and copper tape shield
A medium voltage cable is built in layers that all have to survive. Stranded copper or aluminum conductor, a semiconducting strand screen, EPR or XLPE insulation, a semiconducting insulation screen, a metallic shield and an outer jacket. The two screens control the field at the conductor and at the shield, which is why damage to either one matters more than a scuff on the jacket.
The shield is usually copper tape, sometimes with a drain wire, and it carries fault current as well as grading the field. Cable with a torn or corroded tape shield cannot simply be taped over. Jacket type matters too: PVC, CPE and low-smoke jackets behave differently in a tray, in sunlight and in a wet location.
- EPR insulation for flexibility, XLPE for higher temperature rating
- Copper tape shield with or without a drain wire
- Jacket marked for sunlight resistance or tray use where relevant
- Class and conductor size printed continuously on the jacket
Reel lengths and jacket condition
Reels for this cable commonly carry 250 to 1,000 ft at the larger sizes, and up to 2,500 ft or more at the smaller ones. Part reels are the norm in surplus, and a 15 kV reel with 400 ft left is a genuinely useful item because that length covers a great many plant runs with cutback allowance.
Jacket condition is what we check after length. Sun cracking, flat spots from storage on a hard surface, drag marks from a pull and moisture in an open end all reduce what the reel will bring. A reel with factory-sealed ends and a legible print is easy to quote. One with no markings has to be identified from a cut end.
Questions sellers ask
Which medium voltage class is most common in Tennessee plants?
The 15 kV class, because it covers 13.8 kV distribution and 12.47 kV systems, which are widespread in industrial plants and on utility primaries. The 25 kV class follows, used on 22.9 kV and 24.9 kV systems. The 5 kV class persists in older plants with 4.16 kV motors and switchgear.
Can 15 kV cable be used on a 5 kV system?
Electrically it has more insulation than the lower voltage needs, and the cable is larger and stiffer as a result. It is often done where one cable type is stocked for the whole plant, and terminations are available for the larger diameter. It is not done the other way round, since a lower class cannot be used above its rating.
How much length is lost when a cable end is reterminated?
Allow a few feet at each end for a stress cone or cold-shrink kit, and more where the end has taken moisture or the shield has been disturbed. On a short run that allowance can be a meaningful share of the total, which is why very short medium voltage lengths are usually bought for repair stock rather than for a new installation.
What markings should be on a medium voltage reel?
The jacket print should show the voltage class, conductor size and material, insulation type, shield and jacket, and often the manufacturer and year. The reel tag adds length and a factory order number. Photographs of both, plus a frame of a cut end, let us identify a reel that has lost its paperwork.
Send us your reel list
Six details are enough for a first review: what the cable is, the metal, the size, the footage or reel count, the condition and where it sits. Photographs can follow by text or email. There is no fee and no obligation, and nothing moves until written terms are agreed.
Medium voltage reels to move?
Send the voltage class, conductor size and footage for each reel, with photographs of the tags.
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