MV105 Cable Guide: Specifications, Applications, and How to Choose

The MV105 cable is often mentioned in medium-voltage projects, but many people are not clear about its structural design, scope of use, and selection requirements. In this article, we will introduce the structure, material, and technical specifications of MV105 cable in turn, which will help you understand this type of cable thoroughly. Through these details, you can judge whether MV105 is right for your project and know how to select it to reduce the risk.

What Is MV105 Cable

The MV105 cable is a medium voltage power cable defined according to UL 1072, mainly used in medium voltage power distribution and power transmission systems. Here, “MV” means Medium Voltage and “105” means that the cable insulation can withstand an operating temperature of 105°C under long-term operation.

Construction of MV105 Cable

Conductor Options

Most MV105 cables utilise Class B stranded annealed copper conductors. The purpose of this construction is not to be soft, but to maintain control over the conductor surface morphology while ensuring conductive stability, so that the subsequent shielding and insulation can fit evenly. If the conductors are irregularly stranded, the electric field distribution becomes unstable, and localised stress problems are more likely to occur during long-term operation.

Cable Insulation

The insulation system is the heart of MV105 cables, and it is one of the most under-estimated aspects of cable specification, but it has a significant effect on long-term performance.

MV105 has two typical insulation materials: EPR and TR-XLPE.

• EPR insulation has stability in high temperatures and dynamic loading, and has greater flexibility for environmental variations, hence can be applied in situations whose operating conditions are comparatively more complicated, accompanied by large variations in temperatures.
• TR-XLPE focuses primarily on retarded ageing of the electrical tree and has kept better insulation conditions than TR. Its use is appropriate in situations where a clear expectation of service life exists.

Shielding and Jacket

A difference between MV cables and LV cables is the presence of a shielding structure. MV105 cables typically contain conductor shields and insulation shields. They are not intended to enhance cable strength, but to allow for a more even distribution of the electric field, to reduce the risk of localised stress concentrations. On top of this, the outer layer is equipped with a metallic shield, commonly in the form of a copper tape shield, which is used to provide a stable earth path.

In the outermost layer, the jacket assumes the role of environmental protection. Different jacket materials offer different levels of resistance to moisture, abrasion, or chemical environments, which is related to whether the cable can be used in direct burial, underground, or industrial environments.

These structural layers are not optional designs, but are important prerequisites for the safe operation of medium voltage systems.

MV105 Cable Voltage Ratings and Insulation Levels

MV105 cables are mainly used in medium-voltage systems in real projects, so the choice of voltage rating is very important. Common voltage ratings are 5kV, 15kV, 25kV, 35kV, and even 46kV for special projects. When choosing a voltage rating, you need to think about the type of system, the load capacity, and the need for future expansion.

Insulation level is another important criterion, and MV105 cables are usually classified into two categories: 100% insulation level and 133% insulation level. 100% IL is for grounded systems, while 133% IL is better for ungrounded systems or systems with a high probability of short circuits. Correctly matching voltage and insulation level can help you to reduce the risk of insulation damage and accidents, and at the same time prolong the life of your cables.

Applicable Standards and Certifications

MV105 cables are required to meet a variety of standards and certifications to be safe and engineering viable.

• UL 1072: This is the primary standard for MV105 cables and defines the type and performance requirements for medium voltage cables.
• ICEA S-93-639 / S-94-649: Provides construction specifications for conductors, insulation, and shielding.
• AEIC CS8: Provides load rating and electrical performance test methods.
• Flame retardant, environmental, or other tests: including NEMA WC74, CSA FT4, etc., to verify the fire, oil, and other resistance of cables.

These standards are not merely documented requirements, but in fact guarantees of real construction, acceptance, and long-term operation. The clear perception of these standards will assist you in defining the product that meets the requirements of your project in the procurement or design phase.

Applications of MV105 Cable

Utility and Power Distribution Systems

MV105 is widely used in distribution networks and transporting power from the substation or distribution node to the next level of consumers. It is found in urban underground power distribution systems, utility power supply systems requiring continuous operation under moist conditions, and is safe and reliable.

Industrial and Commercial Facilities

Industrial plants or commercial facilities also commonly rely on MV105. The cable is used to supply the main power supply to the plant or to power critical equipment, and needs to be stable for a long time while carrying high currents. For companies with continuous production, this relate their production and safety.

Renewable Power Systems and Infrastructure

The MV105 is used in the step-up section or connecting box transformers to substation cables for wind farm and photovoltaic power station renewable energy projects. Owing to the complexity of the environment, the cables have to be highly resistant to heat and mechanical stress, humidity, and UV radiation. Most such projects will need cables with their structural integrity and reliable shielding to keep power transmission stable.

Installation Methods of MV105 Cable

MV105 cables can be installed in a variety of ways, and choosing the right laying method is important to the operational stability of your system.

• Direct burial: in an underground environment where the cable jacket needs to be resistant to moisture and mechanical damage.
• Conduit or bridge laying: usually used in industrial plants or power distribution rooms for easy access and line management.
• Cable trench: mostly located in urban power distribution or large facilities, densely laid, requiring attention to cooling and construction space.

The cable’s life is greatly affected by environmental factors. In wet or buried, corrosive, or high-temperature conditions, it is essential to choose the corresponding materials for jackets like PVC, LLDPE, or CPE. The corresponding combinations of cable laying and materials for jackets can prevent ageing, damage, and downtimes.

MV105 vs Other Medium Voltage Cables

MV105 vs MV90

MV105 and MV90 are both medium voltage cables, but differ in shielding and construction.

• MV105 is completely shielded with copper tape to ensure a stable grounding system with a well-defined electric field distribution.
• MV90 is normally protected with a copper wire screen and is a flexible design, but not quite so effective for high current shielding over a longer distance.

While the two are interchangeable in some projects, system grounding and loading requirements must be considered, or safety and longevity may be affected.

MV105 vs Standard MV Cables

MV105 is more concerned about higher temperature resistance, even shielding, and stability against structural deformations as compared to other MV cables. It is more reliable in MV power distribution systems, industry, and renewable energy plants, while also reducing costs for maintenance.

How to Choose the Right MV105 Cable

Step 1: Confirm Voltage Rating and System Type

• Verify that the operating voltage is as specified by its rating.
• Select 100% IL or 133% IL insulation class depending on whether the system is grounded or not.
• Using the wrong voltage may cause insulation damage or safety problems.

Step 2: Choose the Right Insulation Material

• Based on the operational environment and loading conditions, EPR or TR-XLPE insulation can be selected.
• This is because material stability affects how well a material sustains high-temperature environments, humid conditions, or prolonged usage.
• Using a material without thinking of the environment will increase your maintenance costs.

Step 3: Determine Shielding and Grounding Needs

• Is the type of shielding, copper tape or copper wire, adequate for ground and EMI protection?
• Ineffective shielding might result in unbalanced electric fields or system interference, or localised overheating.

Step 4: Match Jacket and Installation Environment

Depending on the different installation techniques, different jackets need to be used. While direct burial entails resistance to moisture and mechanical forces, it is primarily a matter of abrasion-resistant properties for bridge laying. Accordingly, you have to match your cable to its necessary jacket for its installation requirements.

Step 5: Verify Compliance, Testing, and Documents

• Check that the product complies with UL 1072 Type MV-105 and review the test report.
• Documentation must be model-specific, not a generic template.
• Check that ICEA / AEIC standards meet program requirements.
• Mismatches between the documentation and the actual product may result in acceptance problems or safety hazards.

FAQ

What Are The Benefits of MV-105 Cable Over THHN or XHHW Cable?

MV105 is a medium voltage power cable, typically rated from 600V to 35kV, and it is used in power distribution backbone or in factory power distribution. THHN/XHHW, on the other hand, is a low-voltage building wire, usually below 600V, and it is applied to the power distribution of the branch circuit.

That said, MV105 has the advantage of being able to withstand higher voltages and harsher outdoor or industrial environments, and its thicker insulation and and has better durability due to thicker insulation and jacketing.

Does The MV105 Cable Meet UL 44 or CSA Standards?

Yes, the MV105 cable meets the UL44 standards, as well as others from CSA. This is aimed at ensuring the materials, configurations, and safety of the cable meet the standards.

It is, therefore, ideally suited to applications in harsh environments, including high temperatures, humidity, a degree of chemical corrosiveness, and direct burial, such as in power stations, sewerage works, or overhead and underground transmission and distribution lines.

Can The MV105 Cable Be Used In Outdoor or Direct Burial Applications?

Yes, because MV105 cables are designed to have a weatherproof outer jacket that can be used outdoors in overhead or direct burial installations. In installations where it may be used for direct burial, no additional conduit is needed, but if it is to pass through areas where there are rocks or where machinery may be driving over it, it is advisable to have a mechanical protector, such as sleeving or an enhanced armoured design.

Final Thought

The choice of MV105 cables plays a crucial part in determining whether your follow-up process becomes a success or not. Honest Cable can provide you with MV105 cable specifications that meet your project requirements, clear technical documents, and stable delivery support. Contact us for an MV105 cable solution for your application.