Medium voltage cable, 2 kV to 35 kV: the constructions we buy
In this family a single number, the voltage class, tells you less than the construction does. A 15 kV tape-shielded reel and a 15 kV concentric neutral reel are different assets with different buyers.
- 5 kV to 35 kV
- 100% and 133% levels
- Tape, drain wire, CN
Distribution cable in this range runs from 2 kV pilot runs up to 35 kV feeder. The classes that actually appear on a Carolina loading dock are 5 kV, 8 kV, 15 kV, 25 kV and 35 kV. Above roughly 2 kV the cable is generally shielded, because the voltage stress at the insulation surface needs a conductive layer to control it. Below that, unshielded constructions still exist and most people who handle them treat them as low voltage.
Three shield families cover nearly everything we see. Copper tape shields are applied helically over the insulation semicon with an overlap and some form of drain path. Drain wire shields use bare copper wires in contact with a semicon or foil layer. Concentric neutral constructions lay a full layer of copper wires over the insulation for URD and pad-mounted distribution, where the neutral return runs on the cable itself. Each behaves differently on a reel and each is priced on its own terms.
Insulation is either EPR, a thermoset rubber, or XLPE, cross-linked polyethylene, often tree-retardant. Both are thermoset and both tolerate the conductor temperatures that set ampacity, but they age differently and they look different when a reel is opened. Jackets run from PVC through PE and CPE to low-smoke zero-halogen where a plant or a tunnel specified it. None of that can be told from a photograph of a flange, which is why we ask for the exposed end.
What we buy in this family
Condition and documentation decide the basis, not the family alone. These are the forms this material usually arrives in.
- 15 kV tape-shielded feeder on reels
- 25 kV and 35 kV shielded cable
- Concentric neutral URD cable
- 5 kV and 8 kV unshielded runs
- EPR and XLPE insulated constructions
- Copper and compact aluminium conductors
- Partial reels with legible jacket print
Shielded and unshielded: the first question on any reel
If there is a metallic layer visible under the jacket, the cable is shielded, and that layer is the first thing a buyer looks at. Tape shields are thin copper, usually overlapped, sometimes with a single drain wire beneath the tape. Drain wire shields are a set of bare copper wires. Concentric neutrals are a full layer of wires sized for fault current.
Unshielded constructions show up at 5 kV and below in older plants, and they are simpler to assess because there is less to damage. They are also less useful to a buyer who needs 15 kV material. Sorting by class and shield type is the most useful thing a seller can do before we look.
Insulation level, water and what a tape shield tells you
The 100% and 133% insulation levels are performance categories, not sizes. A 133% cable carries a thicker wall for the same voltage class, which gives more margin for time and for the occasional overvoltage, and it is the more common industrial specification. A buyer needs to know which one is on the reel.
Water is the damage that shows first. A tape shield that has been wet for years turns green and then black, the copper is consumed in patches, and the insulation underneath may have taken on moisture that only shows under test. A reel stored on its side with the lagging boards missing is where this happens.
Kinks, cut-backs and the footage you actually have
Medium voltage cable does not forgive bending. A reel that was dropped, or pulled around a corner tighter than its radius allows, has a kink that cannot be dressed out, and the remedy is to cut back past the damage. That is why a 500-foot reel may be a 380-foot reel by the time it is usable. Jacket print is the other half of the evidence, and where it has weathered away, the cable is a judgement.
Where this cable turns up in the two states
Most medium voltage cable in the Carolinas is distribution plant. Duke Energy and the electric cooperatives run 12.47 kV and 24.94 kV class circuits across the Piedmont and the coastal plain, which puts 15 kV and 25 kV cable in every utility yard from Gastonia to Florence. Plants take 15 kV service at their own substations.
The other concentration is generation and campus work. Utility-scale solar across the North Carolina coastal plain and the South Carolina Midlands collects at medium voltage before it steps up, and the data centre corridor builds 15 kV distribution inside halls that never fully switch off. A redesigned phase leaves cable on reels.
Coverage
North and South Carolina
Every city page carries the local industrial base and access notes. Start from a state hub if you are not sure which one applies.
If the material is in one of these states
Medium voltage cable, 2 kV to 35 kV questions
What does 133% insulation level mean on a 15 kV cable?
It means the insulation wall is sized at 133% of the level used for a 100% construction, giving more margin against overvoltage and against the effects of age. The two are not interchangeable where a design specifies one. The 133% cable has a thicker wall and a larger outside diameter, so it will not fit the same elbow body.
Will you buy cable with water in the tape shield?
We will look at it, but the shield is where the damage shows and it does not repair itself. Green or black tape, patchy shield continuity, or a jacket open to weather for years all reduce what the cable can be used for. Sometimes the reel is copper recovery rather than cable.
How much cut-back does a kinked reel need?
Enough to get past the point where insulation and semicon have been strained, which is a judgement made on the reel rather than a fixed number. A kinked 15 kV reel often loses a substantial part of its length, and one that was dragged rather than lifted may not be usable at all.
Do you take concentric neutral URD cable?
Yes. Concentric neutral is common on utility distribution and on pad-mounted work, and the neutral wires are part of the value as well as part of the construction. It is reviewed by conductor size, neutral wire count and size, insulation type and footage, and it is far easier to place when the reel still carries its tag.
Send medium voltage cable, 2 kv to 35 kv details
Construction, footage, condition and pickup city. Photographs can follow once a buyer has replied.
Or email saleselectricalbuyers@gmail.com
- No fee and no obligation to sell.
- Written lot terms before anything moves.
- Pickup scheduled around your access rules.