What we buy
Ranges we buy on this page
Transformer Buyers NC buys used, surplus, failed and obsolete isolation transformers throughout North Carolina. This page covers equipment identification, shielding checks, insulation testing and removal planning for units with separate primary and secondary windings.
| Phase | kVA | Voltage | Fluid |
|---|---|---|---|
| 1 or 3-phase | 1 - 1,000 kVA | 5 kV | Dry-type |
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 a Isolation Transformers is
An isolation transformer has separate primary and secondary windings with no electrical connection between them. Energy passes through the magnetic field rather than a shared conductor.
A unit may have a one-to-one voltage ratio or change voltage; a 480-to-120-volt nameplate does not, by itself, establish the shielding arrangement inside its enclosure.
An electrostatic shield, sometimes described as a shield winding, can sit between the primary and secondary windings to reduce capacitive coupling. Not every isolation transformer has one.
The shield lead, grounding diagram and manufacturer's construction records help distinguish a shielded isolation unit from an ordinary separate-winding transformer removed from a machine panel.
Local reality
Where Isolation Transformers turn up in North Carolina
North Carolina hospitals and labs use isolation transformers in specialized electrical systems, instrument installations and test equipment. A hospital unit may belong to an isolated power panel with a line isolation monitor.
Preserve the panel drawings and circuit identification so the transformer is not confused with the monitoring equipment during a renovation.
Marine facilities along the North Carolina coast may have shore-power isolation units, while machine shops and test floors use separate-winding units around drives, instruments and experimental loads.
Salt deposits on a coastal enclosure and metal dust inside a machining-area cabinet point to different inspection needs, even when their nameplates show matching ratings.
Around the site
What we check before we quote
Identification starts with photographs of the nameplate, terminal compartment, shield connection and enclosure. Record kVA, primary and secondary voltages, frequency, phase and any wiring diagram.
We inspect the shield winding or screen arrangement, insulation resistance, inter-winding capacitance and enclosure condition, using available records before deciding which additional tests are appropriate.
An isolation unit's shielding is hidden, so exterior photographs alone cannot establish its condition. A visible ground lug does not prove that the internal screen remains connected.
Shield continuity checks, grounding verification and suitable electrical tests help assess that shielding; insulation resistance and inter-winding capacitance readings answer related but different condition questions.
Where it sits
Oil, PCBs and testing
Many isolation units from hospitals, labs and machine cabinets are dry-type, but construction must be confirmed from the nameplate and tank. For liquid-filled equipment, retain fluid identification, sampling reports and service records.
Appearance, age or an isolation label cannot establish PCB status; documented fluid information and appropriate testing govern that determination.
Before insulation testing, a qualified technician should disconnect sensitive electronics, surge devices and monitoring circuits according to the manufacturer's instructions. Record test voltage, winding temperature and which terminals were connected together.
On hospital equipment, leaving a line isolation monitor attached can distort readings or expose components to an unsuitable test voltage.
On the ground
Rigging, weight and transport
Removal planning starts with the manufacturer's weight, lifting instructions and the actual route out of the building. An isolation transformer inside a hospital panel may require cabinet disassembly before lifting.
Check doorway clearance, floor loading and anchor bolts; enclosure sheet metal and terminal brackets are not substitutes for designated lifting points.
For a marine shore-power unit or a test-floor cabinet, document base dimensions, center of gravity and any loose internal assemblies before transport. Secure the core-and-coil assembly as the manufacturer directs.
Protect shield terminals and insulating barriers from straps, and select a forklift, crane or trailer from verified weight and access conditions.
Local reality
What moves the number
The technical assessment depends on more than kVA and copper content. A documented electrostatic shield, legible voltage markings and usable test records establish what the isolation unit actually does.
Missing shield leads, damaged terminal insulation or an undocumented rewind can leave the original isolation and noise-control characteristics uncertain despite an intact enclosure.
Condition also includes the faults that caused removal. Burned winding varnish, a grounded shield, moisture contamination and loose core clamps require different follow-up checks. Separate those findings from cabinet dents or failed accessories.
A hospital renovation record or machine-shop maintenance report can explain whether the unit was retired intact or disconnected after a fault.
Around the site
When to call us about a isolation
Contact Transformer Buyers NC when an isolation unit is scheduled for removal from a hospital renovation, lab shutdown, marine facility or machine-shop rebuild.
Early identification allows shield records and terminal photographs to be collected before crews separate the cabinet, grounding conductors and drawings that establish the equipment's construction and service history.
Failed and obsolete isolation transformers can also be reviewed, including units with burned windings or missing enclosure panels. Provide the North Carolina site location, nameplate photographs, known fault history and access restrictions.
Keep test-floor wiring labels and hospital panel schedules with the records, and identify who controls electrical isolation and lifting authorization.
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
Is every isolation transformer fitted with a shield?
No. Separate primary and secondary windings establish electrical isolation, but an electrostatic shield is an additional construction feature. Look for a shield terminal, grounding diagram or manufacturer's drawing. A ground connection on the enclosure alone does not prove that an internal shield is present.
Service area
Can a hospital isolation panel be assessed intact?
Yes. Photographs of the complete panel help identify the transformer, line isolation monitor and associated circuits before disassembly. Include the transformer nameplate and panel schedule. Electrical testing requires a qualified technician to isolate connected monitoring devices and follow the manufacturer's procedures.
Payment
What records help with marine isolation transformer removal?
Retain the shore-power wiring diagram, shield grounding details, nameplate photographs and any insulation test reports. Note salt exposure, enclosure corrosion and lifting access at the North Carolina facility. These details help separate installation damage from winding faults and support a suitable removal plan.
Logistics
Oil, PCBs and testing: what should a seller know?
Many isolation units from hospitals, labs and machine cabinets are dry-type, but construction must be confirmed from the nameplate and tank. For liquid-filled equipment, retain fluid identification, sampling reports and service records.