What is medium voltage cable?
Medium voltage (MV) cable is designed to transmit electrical power between 5 kV and 35 kV, commonly used in commercial, industrial, and utility applications.
MV cable bridges the gap between low voltage distribution and high voltage transmission. Depending on the manufacturer and system design, the standard voltage range may vary. Popular types include MV-90 and MV-105, which are rated for 90°C and 105°C operating temperatures respectively. Medium voltage cable is critical for reliable power delivery in high-demand environments.
What is the construction of a medium voltage power cable?
Medium voltage power cables typically feature copper or aluminum conductors, insulation (XLPE or EPR), shielding, and robust jacketing for protection and flexibility.
MV cable is available in both single and multi-conductor formats, with shielded or unshielded designs. Key construction components include:
- Conductors: Usually copper or aluminum
- Insulation: XLPE (Cross-Linked Polyethylene) or EPR (Ethylene Propylene Rubber)
- Shielding: Copper tape or copper wire shields applied helically around the insulation
- Jacket: Typically PVC (Polyvinylchloride) or CPE (Chlorinated Polyethylene)
Medium voltage cables are offered with either 100% or 133% insulation levels, selected based on fault clearing times:
- 100% insulation: For grounded systems with fault clearing times ≤1 minute
- 133% insulation: For ungrounded or high-resistance grounded systems with fault clearing times <1 hour
Choosing the right insulation level ensures optimal performance under fault conditions and voltage surges.
Where is medium voltage cable used?
MV cable is used to deliver power in harsh, high-demand environments including utility plants, factories, and infrastructure systems.
Engineered for rugged performance, MV cable supports installations in:
- Pulp and paper mills
- Petrochemical and steel plants
- Textile mills
- Water and wastewater treatment facilities
- Mines and railroads
- Utility generating stations
It can be installed in conduit, open tray, aerial applications, direct burial, and underground ducts. MV cables meet NEC standards for both wet and dry locations, making them suitable for diverse use cases.
What are the benefits of medium voltage cable?
MV cables offer electrical stability, long-term durability, and safe operation across a wide range of industrial and utility power systems.
Key advantages include:
- Reliable power transmission over medium distances
- High thermal ratings (up to 105°C)
- Rugged insulation and jacket materials resist abrasion, chemicals, and moisture
- Flexible design for easier installation
- Support for grounded and ungrounded systems
These features make medium voltage cable a trusted choice for engineers and procurement teams seeking high-performance solutions for critical systems.
Need help selecting the right medium voltage cable?
Allied Wire & Cable offers a wide selection of industrial-grade medium voltage power cables. Request a quote or speak with our team for help matching your system requirements to the right MV cable specification.