A Complete Guide to Medium Voltage MV90 Cables

MV90 Cable is often mentioned in MV distribution projects, but many people only know that it is an MV cable; however, they don’t know exactly what conditions it is for, and what the difference is between it and other MV cables. This article will explain in detail what an MV90 cable is, its construction, characteristics, and why and when a choice for this type of cable should be made in a project to help you have a better handle on selection, avoiding rework or risk due to a lack of understanding.

What Is MV90 Cable?

MV90 Cable is a medium voltage power cable designed to North American standards for use in medium voltage power transmission systems. It is typically rated from 5kV to 35kV in most projects and is designed for industrial, utility, and underground distribution networks.

The name MV90 itself contains key information:

• MV stands for Medium Voltage
• 90 indicates that the long-term permissible operating temperature of the cable insulation is 90°C

This means that, under normal operating conditions, MV90 cables can be operated consistently at conductor temperatures of 90°C with no loss of insulation performance or service life.

If you have worked with MV105 before, you can see that, in this regard, the difference in the cable is not necessarily in the voltage levels, but in the temperatures at which they can operate. MV90 is more suited to medium voltage power distributors, rather than high heat load scenarios or high-temperature areas.

MV90 Cable Construction and Structure

Conductor Options

MV90 Cable is typically available in two conductor options: copper or aluminum.

• MV90 Copper Cable: has better conductivity and is relatively compact, so it is good for systems with space constraints.
• MV90 Aluminum Cable: is lighter in weight and lower in cost, and is often used in distribution projects for large cross sections and at medium to long distances.

In practice, your selection is very often based on three issues: budget, current-carrying requirements, and installation conditions.

Insulation Materials

The most common insulation for MV90 cables is XLPE (cross-linked polyethylene), with EPR also used in some applications.

The XLPE materials are chosen on account of their stability within the temperature class of 90°C, along with good electrical properties, making it an excellent material for use within cable mediums that work at higher voltages for longer periods of time.

Shielding and Jacket

A complete shielding design is normally adopted for the MV90 cables in order to ensure a stable distribution of the electric field and reduce possible risks during operation.

Primarily, the purpose of the conductor shielding and insulation shielding for those portions of the insulation that are outside the conductor shielding region is to distribute the electric field between the conductor and the insulation layer. This ensures that the stress fields are not localized.

On this foundation, the cable will also have a metallic shielding layer. This layer is typically formed using copper tape or copper wire. It is employed in grounding as well as completing a current path during a fault, thereby increasing safety.

The external jacket layer is typically of PVC or LLDPE material. This material itself is a non-conductor of electricity but protects the entire setup from water entry, mechanical damage, and environmental factors. In the event that the project requires the cable to be buried, operate in wet conditions, or remain fixed for an extended period of time, the function of the external jacket layer could very well affect the ease of maintaining the entire cable, as well as its stability in its lifetime.

MV90 Cable Voltage Range and Specifications

Common Voltage Classes

In practice, the MV90 Cable covers a number of common medium voltage ratings, including:

• 5kV
• 8kV
• 15kV
• 25kV
• 35kV

Different voltage levels are not chosen freely, but are directly related to the structure of the power supply system, the configuration of the transformers, and the length of the lines. For you, choosing the right voltage level means more stable system operation and easier project acceptance.

Insulation Level

In addition to the voltage class, MV90 cables have another parameter that is easily overlooked: the insulation class.

• 100% Insulation Level

for networks with good grounding systems and controlled fault removal times.

• 133% Insulation Level

provides a higher safety margin for more reliable scenarios.

If you have a project with a high demand for continuous power supply, or if you are not sure about the grounding conditions, choosing a higher insulation class often reduces the risk of long-term operation.

Applicable Standards and Certifications

UL and ICEA Standards for MV90 Cable

In North American markets, it is primarily UL 1072 that is relevant to MV90 cable. UL 1072 specifies requirements for cable design, insulation characteristics, temperature rating, and testing.

If you work with the utility industry, EPC contractors, or industrial end-users, UL compliance may be a requirement in and of itself. The use of the MV90 cable, as defined in UL 1072, makes the inspection process much more manageable.

Aside from UL, another common set that MV90 cable adheres to is the ICEA medium voltage cable specifications. ICEA specifications are more involved with engineering practices such as shield design, insulation thickness, and testing.

CSA and Other Regional Compliance

When the project is in Canada or for more North American compliance, the MV90 cable may also comply with the CSA C68.5 specification.

This makes it possible for a single design of MV90 cable to work well in different regulatory settings. In cross-border supply or standardized equipment platforms projects, this makes it unnecessary to handle different cable designs.

Types of MV90 Cable

Single-Core vs Multi-Core MV90 Cable

In medium voltage systems, single-core MV90 cable is the most common type. The advantages of the single-core design are good heat dissipation and simple construction, and it is used for high currents and flexible laying scenarios. Therefore, in most substations, trunk lines and underground distribution systems, you will find single-core MV90 cables laid in groups of three phases.

Multi-core MV90 cables (e.g., in three-core configurations) are more often found where space is limited, or wiring is more centralized, such as inside some industrial facilities or in compact distribution systems.

The choice between single- and multi-core usually depends on the installation space, maintenance habits, and the way your system is designed.

Shielded MV90 Cable Variations

Structurally, MV90 cable is almost always a shielded medium voltage cable, but shielding methods can vary.

• Copper Tape Shielded MV90 Cable

Continuous shielding and compact structure, often used in standard distribution networks.

• Copper Wire or Concentric Neutral Designs

Better suited for systems where a defined grounding path is required, and fault current return is part of the design.

When selecting a shielding structure, you should match it with the grounding method and system requirements.

Applications of MV90 Cable

Underground and Duct Installations

The MV90 cable is ideally placed for underground laying and pipeline installations. Its insulation and sheath construction can cope with humid environments and meet the requirements for electrical stability in medium voltage systems. Therefore, MV90 is a very common choice for underground wiring in urban distribution networks and industrial parks.

If your project involves direct burial or trench laying, MV90 cable offers sufficient safety margins at both structural and standard levels.

Industrial and Utility Power Distribution

In factories, power stations, or utility systems where continuity of supply is often more important than cost alone. The MV90 cable is designed for this kind of long-running medium voltage distribution scenario. It can stably carry medium to high current loads while operating for long periods of time within a reasonable temperature range. On the other hand, it also helps you to reduce maintenance stress due to insulation deterioration.

Renewable Energy Projects

The use of MV90-type cables is gradually becoming common in new energy projects, such as solar energy and wind energy. These projects generally involve the use of medium-voltage collector lines. These lines are applied to concentrate the units that are involved in the decentralized production of power and link them to the boosting energy supply. The project generally involves the cable being fixed in one position and the need for the cable to remain stable for a considerable amount of time. It is for this reason that the design and criteria for the use of MV90-type cables to meet the reliability and control demands of new energy projects are quite well established.

How to Select the Right MV90 Cable for Your Project

Voltage Rating and System Structure

The cable voltage rating should match the system voltage with a reasonable margin. Common ratings such as 5kV, 15kV, or 35kV correspond to different distribution levels.

Current Carrying Capacity And Conductor

The choice of conductor cross-section area, copper or aluminum material, will directly affect the cable current-carrying capacity and line loss. You need to make a full judgment in combination with the length of the line, the load, and the permissible temperature rise.

Laying Method And Environment

Underground laying, pipe laying, or cable tray installations do not have the same requirements for sheath and shield construction. Therefore, wet environments, soil conditions, or external loads can affect your final configuration.

Standards and Certification Requirements

Whether a project requires UL 1072, ICEA, or CSA standards is usually specified during the bidding or design phase. Matching standards early can save you from many later rework or certification issues.

FAQ

Is MV90 Cable Suitable for Wet Locations?

Yes. The MV90 cable’s insulation and sheath construction are made to withstand wet environments and are often used in underground or pipeline laying. However, the suitability of the MV90 cable for direct burial will need to be confirmed by the type of sheath and project specification.

MV90 vs MV105 Cable: What Is the Difference?

The only variance between the two cables is the operating temperature of the insulation of the MV90 and MV105 cables.

• The MV90 cable has a temperature rating of 90°C
• The MV105 cable has a temperature rating of 105°C

The construction, voltage rating, and application range are very similar, but the MV105 is preferred for operation in higher ambient temperatures or under heavy continuous loads.

Do The Neutral Sizes Change Between The MV90 And The MV105 Cable?

In most cases, the size of the neutral does not automatically change from MV90 or MV105.

The size of the neutral is primarily determined by the design of the system, such as the earthing method, the fault current requirements, and the relevant standards and specifications, and not directly by the insulation temperature class.

MV105 permits higher conductor operating temperatures, but this does not mean that the neutral must be correspondingly larger. Adjustment of the neutral size is only possible if the fault current or thermal stress requirements change in the system calculations.

What Is the Difference Between MV90 and URD Cable?

MV90 and URD are often put together, but they are not the same concept.

MV90 is a medium-voltage cable type that emphasizes insulation temperature ratings and standard systems.

URD (Underground Residential Distribution) is more of an application classification, referring to cables used in underground distribution systems.

However, some URD cables may meet the technical requirements of MV90 in terms of construction and performance, but not all URD cables are equal to MV90.

Final Thought

MV90 is often a controllable choice as long as the operating conditions, installation methods, and specification requirements are confirmed clearly in advance. If you still have questions about specifications or configurations, please feel free to contact us and communicate your use cases. Honest Cable can assist you in further confirming the right MV90 cable solution, reducing selection risks and speeding up your project.