Apparatus leads · 4/0 to 1000 kcmil flexible copper
Transformer lead wire buyers in New York
A transformer lead is short, heavy and flexible, and it exists to solve a mechanical problem as much as an electrical one. That is why a twelve-foot length can be worth more than a hundred feet of building wire.
- New York State
- Documented lots
- Reels and cut lengths
- Buyer review
Sell this cable
Send the construction, size and footage. Photographs can follow.
Prefer to talk? 614-715-3047 · saleselectricalbuyers@gmail.com
Leads are bought on conductor size, strand construction, insulation system and the condition of the lug. Flexible rope-lay copper from 4/0 to 1000 kcmil carries a real premium over standard building wire because it is what apparatus connections are made from. Short lengths are normal and expected. A lead with a crushed lug, cracked paper insulation or a sharp kink at the terminal is priced as copper, not as a lead.
What a lead has to do that a feeder does not
A transformer lead carries rated current a few feet from a winding to a bushing, or from a bushing to a bus, with minimum voltage drop and with enough flexibility to absorb vibration, thermal expansion and the small movements of a tank that heats and cools. That is why it is finely stranded copper rather than the coarse stranded conductor used in a feeder: flexibility is the specification, and the strand count is what delivers it.
The sizes run from 4/0 up to 1000 kcmil because the currents are large and the runs are short, so voltage drop is not the constraint and ampacity per foot of run is. A 1000 kcmil lead weighs about three pounds per foot, which is why a ten-foot piece is a thirty-pound copper asset, and why a lead is one of the few cable items where very short lengths are traded seriously.
Paper, XLPE and the insulation that decides reuse
Inside an oil-filled transformer, the lead is insulated with paper, often kraft tape wrapped and impregnated with the same oil as the winding. Paper is an excellent dielectric in oil and a poor one in air, because it absorbs moisture quickly. A paper lead that has been cut out and left with open ends in a yard is finished as a lead within days, whatever it looks like. A paper lead that was cut, immediately taped and kept dry can still be usable.
Dry-type transformers, padmounted units and switchgear connections use XLPE, EPR or silicone instead, and those survive storage far better. On pipe-type terminations the picture is different again: the cable rises inside a steel riser to a pothead, and above the pothead the connection to the equipment is made with a short flexible lead, often only a few feet, frequently taped or sleeved. Those riser leads are small in length and heavy in copper.
The handling limits that decide the price
Three things ruin a lead. The first is bending it too tight: paper insulation cracks and tape lifts at a radius that fine-strand XLPE would shrug off, and the crack is where the failure starts. The second is heat at the lug. A soldered lug on a paper lead chars the insulation behind it, and heat-shrink applied carelessly does the same to a taped connection. The third is lifting. A lead picked up by its lug or by a length of unsupported cable puts the whole weight through the terminal and the insulation at the terminal.
The lug itself is the most inspected few inches on the piece. A compression lug applied with the wrong die crushes the strands and leaves the barrel oval; a lug that has been reused has a deformed barrel and often a loose bolt; a lug that was cut off with a saw leaves a burr and a shortened conductor. Photograph the lug square on, and photograph the cut end, because the strand pattern tells a buyer whether the conductor is rope-lay or ordinary concentric.
- Lug type, barrel condition and whether it is still fitted
- Insulation system, and whether paper ends were sealed
- Measured length from lug face to cut end
- Any kink, flat spot or scorch mark, and where it sits relative to the lug
- Whether the lead came off a transformer, a breaker, a pothead or a bus
Specification
What a buyer needs to know about this cable
Every row below changes what a lot is worth. If the reel tag is gone, the jacket print and a cut end usually answer most of it.
Missing detail is not a problem — say what is missing and the review works from photographs.
| Conductor | Flexible stranded copper, rope-lay or bunched, Class G to Class K stranding |
|---|---|
| Size range | 4/0 AWG through 1000 kcmil; 250 to 750 kcmil most common |
| Insulation | Oil-impregnated paper or crepe paper tape on oil-filled apparatus; XLPE, EPR or silicone on dry types |
| Voltage class | 600 V and 1 kV typical inside apparatus; 5 kV and 15 kV on bushing and riser connections |
| Terminations | Compression lug, solderless palm, bolted clamp, or a bare brazed connection |
| Bend radius | Roughly 8 to 12 times the conductor diameter for paper, less for fine-strand XLPE |
| Weight | About 0.65 lb/ft at 4/0, 1.5 lb/ft at 500 kcmil, 3 lb/ft at 1000 kcmil, bare copper |
| Condition signals | Crushed lug, charred or cracked paper, green corrosion in the strands, kinks at the terminal |
Constructions
Leads and apparatus copper we review
The category is small in footage and heavy in metal, and it comes out of every transformer changeout.
Transformer tank leads
Paper-insulated flexible copper from winding to bushing, removed when a transformer is scrapped or re-leaded. Usually the heaviest sizes and the shortest lengths.
Bushing to bus connections
Flexible copper from a bushing terminal to a rigid bus or a jumper, often with a palm at each end. Frequently the best condition lead in the yard.
Riser and pothead leads
Short heavy leads above a pipe-type or high-pressure termination. Taped, sleeved, and usually replaced rather than reused, which is exactly why they reach the surplus stream.
Flexible braid and shunts
Bare tinned copper braid, laminated shunts and expansion connectors. No insulation to damage, priced on copper content, and useful to any switchgear rebuilder.
Dry-type and padmount lead sets
XLPE or EPR insulated leads with moulded or compression terminals. Store well, test easily, and are the most likely lead category to be reused.
Mixed lug-ended shorts
A bucket of leads from a station cleanout. Sorted by size they are worth real money; left mixed with control wire they are weighed and lost.
New York
Apparatus leads in the New York market
Transformer replacement is the main source. A station transformer that has reached the end of its life, or that is being upsized for load or fault duty, is removed as a unit and the leads come off it at the bushing. Older units with paper-insulated leads dominate that stream, and the copper in them is high-grade and clean once the paper is stripped. Where a transformer is re-leaded on site rather than replaced, the removed leads are usually cut into short pieces before they reach a scrap pile.
The buyers for reusable lead are narrower than for building wire. Switchgear rebuilders, transformer repair shops and apparatus manufacturers all want flexible copper in known sizes with sound insulation. That is why a photographed lug and a stated insulation type do more for the price than an extra ten feet of length.
What helps a New York lot move
- Conductor size, strand type and measured length
- Insulation system, and whether paper ends were sealed when cut
- Lug or palm type, and its condition
- Whether the lead was in oil, in air, or in a riser
- Total weight of the lot, as a cross-check on the lengths
Seller questions
Questions sellers ask
Why are very short lengths of lead worth buying?
Because the value is in the copper and the flexibility, not the footage. A 1000 kcmil lead weighs around three pounds per foot, and flexible rope-lay copper is a premium product that a switchgear rebuilder or transformer shop will pay for by weight or by the piece. Ten feet of the right lead is a real asset; ten feet of 12 AWG is not.
How can I tell paper insulation from XLPE?
Paper is wrapped tape with a visible spiral lap, it feels dry and fibrous, and it tears rather than stretches. XLPE is a homogeneous extruded layer, usually black or dark, and it cuts cleanly. On an old oil-filled transformer the paper will also smell of oil. The difference matters because paper that has been open to air is usually finished, while XLPE is not.
What is a riser lead on a pipe-type termination?
It is the short connection above the pothead, where the cable has come up inside a steel riser pipe and terminated, and the last few feet to the equipment are made with flexible copper. Those leads are typically taped or sleeved, are replaced as a matter of course when a termination is remade, and arrive in the surplus stream in short heavy pieces.
Does a damaged lug make the whole lead worthless?
It moves it from lead to copper, which is a significant step down. A crushed or oval barrel, a saw-cut lug or a loose bolted palm means the end has to be cut back and a new terminal made, and on a two-foot lead that is most of the piece. A clean lug with the right die marks is a large part of the value.
Can leads that were in oil be reused?
Rarely as insulated leads, often as copper. Oil-impregnated paper that has been exposed to air takes up moisture and its dielectric strength falls quickly. The conductor underneath is still high-conductivity copper and is bought on weight once the paper is stripped, which is how most transformer tank leads are actually valued.
Keep reading
Related pages
- Substation wire and bus buyersWhere leads sit in the station lot
- Aluminum tube bus buyersThe rigid bus the lead connects to
- Grounding grid conductor buyersBare copper bonding at the apparatus
- HPFF cable buyersPipe-type cable and its terminations
- Decommissioned substation cable buyersWhole-station removals
- Utility surplus conductor buyersStore surplus and odd copper
City pages
Where this turns up in New York
Next step
Send the lot details
Include the storage city, how it is stored and what can reach it. If you have photographs of reel tags or jacket print, send them with the enquiry.
Send the lot
One desk reviews every lot that arrives.
Prefer to talk? 614-715-3047 · saleselectricalbuyers@gmail.com