What we buy
Ranges we buy on this page
This guide explains what makes a transformer suitable for mine duty and why the skid deserves the same inspection as the core and winding. It is for North Carolina mine operators, plant engineers, demolition crews, and trustees handling retired equipment.
| Phase | kVA | Voltage | Fluid |
|---|---|---|---|
| 1-phase | 10 - 333 kVA | up to 25 kV | Liquid or dry |
| 3-phase | 25 - 10,000 kVA | 25 kV | Liquid-filled |
Who we buy from
Six kinds of seller
- Recyclers
- Electrical contractors
- Equipment dealers
- End users
- Demo contractors
- Distributors
Fast offers
A written offer the same business day, based on your photographs.
Dedicated logistics
Our own crew, trailer and crane, not a brokered haul.
No broker fees
One buyer from first call to cleared pad, with nothing skimmed.
How it works
Six steps from photograph to payment
- 01
Take pictures
Photograph the nameplate, the inside of the cabinet and the tank from both ends. Four frames on a phone are enough to price most units.
- 02
Send them to us
Email or text the photographs with the site address and whether the unit is still energised. We reply the same business day with questions or a number.
- 03
Review the offer
The offer names the unit, the site, the price and the pickup window. It is written, dated and good for thirty days unless the unit changes hands.
- 04
We schedule freight
A crew, a trailer and a crane if the pad needs one. You get the date and the arrival window, and the site does not have to close for it.
- 05
Testing on arrival
Winding resistance, insulation resistance and a turns ratio check, plus oil analysis where the unit is liquid-filled. Results travel with the unit.
- 06
Get paid
Payment is released against the signed bill of sale and the scale ticket, by check or ACH, with the paperwork copy left on site.
What we handle
The parts sellers dread
Rigging
Crane, skates and a route survey for anything that will not roll onto a trailer.
Oil containment
Pans, absorbent and a spill plan before a drain plug is touched.
Bill of sale
A document that clears a lien, a lease or a bankruptcy file, not a handwritten note.
PCB paperwork
Testing and manifesting for pre-1979 oil, handled before the unit moves.
On the ground
What it is
Mine-duty equipment is built for the electrical and mechanical demands of a particular mining application. A transformer may sit in a skid-mounted power center with switchgear, cable connections, and protective devices.
The designation alone does not establish suitability for every underground location or hazardous atmosphere.
For underground coal service, applicable Mine Safety and Health Administration approval requirements depend on the equipment and its location. Approval plates, assembly drawings, and enclosure details matter.
A heavy skid or reinforced tank does not, by itself, make an ordinary transformer an approved mining assembly.
Local reality
Why it matters when you sell
Transformer Buyers NC buys used, surplus, failed, and obsolete transformers across North Carolina, including mine-duty units. For evaluation, distinguish the transformer from the complete power center.
Incoming switchgear, outgoing circuit protection, trailing-cable connections, and the skid may belong to one documented assembly rather than separate pieces.
A bent skid can complicate removal even when winding tests look acceptable. Dragging damage may distort crossmembers, crack welds, or shift the tank supports.
Photographs should show skid ends, attachment points, and underside clearance, especially where mud hides wear or a previous repair covers a fracture.
Around the site
The numbers
Record the nameplate kVA, primary voltage, secondary voltage, frequency, impedance, and cooling designation. A plate showing 4,160 volts primary and 480 volts secondary describes a different application from another mine power center.
Copy connection diagrams and tap positions rather than inferring them from cable size.
Separate transformer weight from complete assembly weight; switchgear and a steel skid can materially change the lift. Record overall length, width, height, and ground clearance.
For oil-filled equipment, document fluid type and quantity from the plate or records, along with any available PCB analysis.
Where it sits
Common mistakes
Do not describe a transformer as mine-approved solely because it came from a mine. Missing approval plates, replaced enclosure covers, or altered cable entries can leave the assembly's status uncertain.
Preserve original markings and provide modification records instead of treating thick steel as evidence of approval.
Another mistake is lifting from skid eyes without checking their intended use and condition. Some attachments serve towing or positioning rather than overhead lifting. A qualified rigger should identify approved lift points, evaluate cracked welds, and plan clearance around bushings, radiators, and attached switchgear.
On the ground
How it affects value
Useful ratings and an identifiable assembly make a mine-duty transformer easier to evaluate for potential reuse. Legible nameplates, manufacturer drawings, and test records establish what the equipment actually is.
Unverified voltage connections or missing protection details can prevent a complete assessment despite an intact tank.
Mechanical condition belongs in that assessment alongside electrical condition. A sound winding does not correct a twisted skid, damaged cable termination chamber, or leaking tank seam. Conversely, failed windings do not make documentation irrelevant; construction details and contamination records still guide handling and disposition.
Local reality
What to do next
Start with photographs of the transformer plate, assembly plate, skid, cable compartments, and visible damage. Include existing insulation-resistance or winding-resistance reports with their dates and test conditions.
Do not energize retired mine equipment simply to demonstrate operation, particularly after flooding, a fault, or prolonged outdoor storage.
Before removal, have qualified personnel isolate every source, verify absence of voltage, and address stored energy under the site's procedures. Document access from the equipment location to the loading area, including grades, doorway restrictions, and soft ground.
Keep approval records and fluid paperwork with the unit.
Get started
Get an offer in minutes
Five fields is all it takes. Photographs help, but a nameplate and a town are enough to start.
No fee, no obligation. We reply the same business day.
Tell us what you have
We reply the same business day.
Questions
Straight answers
Equipment types
Does a steel skid make equipment mine-rated?
No. A skid provides mechanical support and may allow repositioning, but it does not establish electrical suitability or regulatory approval. Check the transformer nameplate, complete assembly identification, enclosure construction, and applicable approval records for the intended mine location and service.
Service area
Can you evaluate a failed mine-duty transformer?
Transformer Buyers NC buys failed transformers as well as used and surplus units. Describe the failure, including any winding fault, tank rupture, flooding, or cable-compartment damage. Provide nameplate photographs, fluid records, and skid condition so evaluation includes handling constraints.
Payment
Which weight should the removal crew use?
Use a verified weight for the actual load being lifted, not just the transformer's nameplate weight. Attached switchgear, cable chambers, fluid, and the skid may be included. The rigger should confirm the assembly configuration and lifting arrangement before selecting equipment.
Logistics
How it affects value: what should a seller know?
Useful ratings and an identifiable assembly make a mine-duty transformer easier to evaluate for potential reuse. Legible nameplates, manufacturer drawings, and test records establish what the equipment actually is.