Guide · Safety
Medium voltage cable safety before a lot moves
Cable rated from 5 kV to 35 kV is not a heavy roll of copper. It is a shielded assembly that holds charge, and it stays dangerous until somebody proves otherwise at the point of work.
Request a quote
Tell the desk what you have in Medium voltage cable safety
Send the basics and a buyer reviews the lot, usually the same working day.
- Reviewed by a buyer, not a scale
- Reels, pallets, partials or a full truckload
- Anywhere in Ohio, one desk
- 01Send the wire type, quantity and pickup city.
- 02A buyer reviews the lot and replies with a basis.
- 03Freight and release are agreed, then the load is booked.
Lot details
Everything helps, but the wire type, the quantity and the pickup city are enough to start.
Why medium voltage cable is not scrap copper
Building wire is a conductor with a jacket. Medium voltage cable is a system in a sheath: a conductor, a semiconducting layer, thick insulation, a second semiconducting layer, a metallic shield and an outer jacket. The shield is a conductor in its own right and it is bonded at the ends for a reason. Until the circuit is proved dead and grounded, that assembly can hold a charge and can deliver it through a person holding a saw.
This is also why the material does not price like scrap. The insulation and the shield are most of what a buyer is assessing, and a reel that has been cut carelessly has lost the part that mattered.
Isolate, test, ground, test again
Open the breaker and open the upstream disconnect, then lock and tag both. Treat a remote or supervisory close as possible until the isolation is physically visible. Test at the point of work with a detector rated for the voltage in hand, and prove the detector itself against a known source or a proving unit before and after the test.
Then apply grounds at the work location, and test again once they are on. Cable is treated as live until those grounds exist, whatever the panel schedule, the label on the duct or the electrician who says it was pulled years ago. A written switching order and a second person are worth more here than anywhere else in the plant.
Handling shielded cable
Do not cut a shielded cable until the shield is exposed and bonded to ground at the work point. On a long run, a shield that is floating can take on a potential from induced voltage, and cutting it gives that potential somewhere to go. Score the jacket back, expose the metallic shield, bond it, and only then continue.
Keep the reel on dunnage and do not drop one off a truck. Impact damage to medium voltage insulation does not always show on the outside, and a reel that has been dropped is a reel that needs a test before anyone will trust it.
Bending radius, terminations and test records
Medium voltage insulation does not bend cold or tight. A kinked run is scrap even when the conductor is perfect, because the value sits in the insulation and a crack in it cannot be seen from outside. Follow the manufacturer's published bending radius for the specific construction, and follow the NEC for installation requirements. Do not estimate either from a rule of thumb picked up on another job.
Terminations and splices are the expensive part of any medium voltage job, and a used cable needs a dated insulation resistance test before an installer will put it back into service. That record is what separates a reel that can be reused from a reel that is being recovered.
What to send before an MV lot is discussed
Send the voltage class, the insulation type, the shield construction, the footage and photographs of both ends showing how the terminations were removed. Add a decommissioning note saying who proved the circuit dead, when, and what instrument was used. If the cable was tested before removal, send that result and its date.
Without those, the reel is bought as recovery and priced accordingly, because the buyer is accepting an unknown rather than a cable. With them, it can be considered for reuse, which is a different conversation at a different level.
Related pages
Adjacent cities, wire families and regional briefs.
Other seller guides
All guides- Reading a reel tagWhat the tag carries and what a missing one costs
- Estimating footage by weightWhen the reel scale is the only measurement you have
- Copper versus aluminium valueTwo metals, two sets of facts
- Preparing a surplus manifestThe line items a buyer can actually price
- Photographing a reelSix photographs that answer most questions
- Storing cable to protect insulationUV, water, ozone and reel orientation
Questions sellers ask
Can medium voltage cable be cut up on site for removal?
It can be cut, but only after the circuit is proved dead and grounded at the point of work, and only after the shield has been exposed and bonded. Cutting a floating shield is the part that catches people out, because the conductor being dead does not mean the shield is at earth potential.
What voltage range counts as medium voltage?
In plant and utility practice it generally means above 1 kV and up to about 35 kV, with 5 kV, 15 kV and 25 kV classes the ones you meet most often on Ohio industrial sites. Below that is low voltage cable with different handling rules; above it, the clearance and switching requirements change again.
Does a used MV reel need a test before resale?
Most buyers and installers will want a dated insulation resistance test at minimum, and a high potential test for anything going back into a critical circuit. A reel with no test history is still sellable, but it is sold as-is for reuse at the buyer's discretion rather than as tested stock.
Request a quote
Tell the desk what you have in Medium voltage cable safety
Send the basics and a buyer reviews the lot, usually the same working day.
- Reviewed by a buyer, not a scale
- Reels, pallets, partials or a full truckload
- Anywhere in Ohio, one desk
- 01Send the wire type, quantity and pickup city.
- 02A buyer reviews the lot and replies with a basis.
- 03Freight and release are agreed, then the load is booked.
Second look at the lot
Everything helps, but the wire type, the quantity and the pickup city are enough to start.