Power Cable Solutions for Data Centers
Created on 09.12
Data centers depend on a stable and reliable power supply. From utility incoming power and medium-voltage distribution to UPS systems, generators, switchgear and server equipment, every part of the electrical infrastructure requires properly selected power cables.
As data centers continue to expand, electrical systems are becoming more demanding. Higher power density, continuous operation, strict safety requirements and the need for reliable backup power all place greater importance on cable selection.
Choosing the right power cable is therefore not simply a matter of selecting the correct conductor size. Cable voltage rating, conductor material, insulation, sheath, installation environment, current-carrying capacity, fire performance and mechanical protection should all be considered.
This article explains the main power cable considerations for data center projects and how cable manufacturers can support reliable electrical infrastructure.
1. Why Power Cables Matter in Data Centers
A data center operates around the clock. An electrical failure can affect servers, cooling systems, network equipment and other critical infrastructure.
The power distribution system typically includes several stages:
- Utility or grid incoming power
- Medium-voltage distribution
- Transformers
- Main switchgear
- UPS systems
- Diesel generators or other backup power systems
- Low-voltage distribution boards
- Power distribution units (PDUs)
- Cooling and mechanical systems
- Server and IT equipment
Each stage may require different cable constructions and voltage ratings.
For example, medium-voltage cables may be used between the utility supply, transformers and medium-voltage switchgear, while low-voltage power cables are commonly used for downstream distribution.
This means that a data center project may require multiple types and sizes of power cables rather than one standard cable throughout the facility.
2. Medium-Voltage Cables for Data Center Power Distribution
Large data centers often have substantial electrical loads. Medium-voltage distribution can help move large amounts of electrical power efficiently within the facility.
Depending on the project design and local electrical regulations, medium-voltage XLPE insulated power cables may be used for:
- Utility incoming power
- Transformer connections
- Medium-voltage switchgear
- Internal power distribution
- Generator and electrical infrastructure connections
Typical cable ratings may include 6 kV, 10 kV, 15 kV, 20 kV or 35 kV, depending on the electrical system.
For a medium-voltage cable, important factors include:
- Rated voltage
- Conductor material
- Conductor cross-sectional area
- XLPE insulation
- Metallic screen or shield
- Outer sheath
- Short-circuit withstand capability
- Installation method
- Ambient temperature
- Soil thermal conditions for buried installation
The cable should be selected according to the actual system design rather than simply choosing the largest available conductor.
3. Low-Voltage Power Cables for Data Center Facilities
Low-voltage cables are widely used throughout a data center.
Typical applications include:
- Main distribution
- UPS output
- Generator distribution
- Switchboard connections
- Mechanical equipment
- Cooling systems
- Lighting and auxiliary systems
- Building services
For these applications, common cable constructions may include copper or aluminum conductors with XLPE or PVC insulation, depending on the project requirements.
The required conductor size should be calculated based on the expected load and installation conditions.
Important considerations include:
Current-Carrying Capacity
The cable must be able to carry the required operating current without excessive temperature rise.
Cable ampacity is affected by:
- Conductor size
- Conductor material
- Insulation temperature rating
- Ambient temperature
- Number of loaded cables
- Installation method
- Ventilation
- Grouping and spacing
Therefore, a cable that is suitable in one installation environment may require a different size in another.
Voltage Drop
Voltage drop should also be considered, particularly for long cable runs.
Excessive voltage drop can affect equipment performance and reduce the efficiency of the electrical system.
Short-Circuit Performance
Data center electrical systems may experience high fault levels. The cable must be capable of withstanding the thermal and mechanical effects associated with short-circuit conditions for the specified duration.
4. Copper or Aluminum Conductors?
Both copper and aluminum conductors can be used in power distribution systems, but their characteristics are different.
Copper Conductors
Copper provides high electrical conductivity and allows a smaller conductor cross-section for a given current-carrying requirement.
Copper cables are often considered when:
- Space is limited
- High conductivity is important
- Smaller cable dimensions are preferred
- Equipment connections require compact conductors
Aluminum Conductors
Aluminum has a lower density and is generally lighter than copper.
For larger power distribution systems, aluminum cables can offer advantages in terms of conductor weight and material cost, although the required conductor size and connection design need to be considered carefully.
The choice between copper and aluminum should be based on the complete electrical and installation design rather than material price alone.
5. XLPE Insulation for Reliable Power Distribution
XLPE is widely used for power cables because of its electrical and thermal characteristics.
XLPE insulated power cables can be designed for low-voltage and medium-voltage applications.
For data center projects, XLPE cables may be considered for:
- Main power distribution
- Transformer connections
- Generator systems
- UPS systems
- Medium-voltage feeders
- Building power distribution
The appropriate insulation system depends on the rated voltage and applicable standard.
For medium-voltage applications, the cable construction may include a conductor screen, XLPE insulation, insulation screen and metallic screen, followed by an appropriate outer sheath.
6. Fire Performance Is an Important Consideration
Fire safety is a major consideration in modern data center construction.
A data center contains large quantities of electrical cables installed in buildings, cable trays, shafts and other areas. In the event of a fire, cable materials can influence smoke generation, flame propagation and the overall fire environment.
Depending on local regulations and project specifications, buyers may require:
- Flame-retardant cables
- Fire-resistant cables
- Low-smoke cables
- Halogen-free or LSZH cables
However, these terms describe different performance requirements and should not be treated as interchangeable.
The required fire performance should be clearly specified in the project technical specification.
7. Armored or Non-Armored Cable?
The installation environment determines whether mechanical protection is required.
Non-armored cables may be suitable for protected indoor installations, cable trays or other environments where mechanical damage is unlikely.
Armored cables may be considered for installations where additional mechanical protection is required, such as:
- Underground cable systems
- Outdoor installations
- Industrial areas
- Areas exposed to mechanical impact
Cable armor can be designed using different materials and constructions depending on the applicable standard and project requirements.
The cable manufacturer should receive information about the installation environment before recommending the final construction.
8. Cable Selection for UPS and Generator Systems
UPS and generator systems are critical components of data center power infrastructure.
These systems may operate during normal power supply, transfer operations or emergency conditions.
When selecting cables for UPS and generator connections, engineers should consider:
- Continuous operating current
- Short-circuit current
- Voltage rating
- Cable length
- Installation method
- Ambient temperature
- Parallel cable arrangement
- Required fire performance
- Applicable electrical standards
For high-current systems, multiple parallel cables may sometimes be required.
In such cases, conductor size, cable arrangement and installation spacing should be carefully coordinated with the electrical design.
9. Installation Environment Should Be Considered Early
Cable selection should begin before installation.
The same cable size can have different current-carrying capabilities depending on how it is installed.
For example, engineers should identify whether the cable will be:
- Installed in cable trays
- Installed in ducts
- Buried underground
- Installed indoors
- Installed outdoors
- Installed in vertical shafts
- Grouped with other power cables
- Installed in high-temperature areas
For data centers in hot climates, ambient temperature and heat dissipation can be particularly important.
If cables are installed close together, thermal effects may also need to be considered.
Proper installation design helps ensure that the selected cable can operate safely under actual working conditions.
10. Cable Standards for International Data Center Projects
International data center projects may involve different standards depending on the country, consultant, EPC contractor and end user.
Commonly referenced standards may include IEC, BS, VDE, NFC or ASTM-related requirements.
For example, IEC 60502 series standards are widely referenced for certain power cable applications, while individual projects may specify additional national or customer requirements.
When requesting a cable quotation, buyers should clearly identify:
- Applicable standard
- Rated voltage
- Conductor material
- Number of cores
- Conductor cross-sectional area
- Insulation material
- Screen or armor requirements
- Sheath material
- Fire-performance requirements
- Installation environment
- Required testing
- Cable drum and packaging requirements
Clear technical information helps the manufacturer prepare an accurate quotation and avoid unnecessary changes later.
11. What Data Center Cable Buyers Should Ask a Manufacturer
For an international data center project, price is only one part of the purchasing decision.
Buyers should also consider the manufacturer's production capability and quality control system.
Useful questions include:
- What voltage levels can you manufacture?
- Which international standards can you supply?
- Can you provide technical datasheets before ordering?
- Can you provide type test reports or relevant test documentation?
- What conductor classes are available?
- Can the cable construction be customized according to the project?
- What are the normal production lead times?
- What cable lengths can be supplied per drum?
- How are cables packed for international transportation?
- Can you provide inspection and quality documents?
These questions help establish whether a supplier is suitable for long-term project cooperation rather than simply comparing unit prices.
12. Power Cable Solutions from NINGLAN Cable
NINGLAN Cable is a cable manufacturer established in 1990, with more than 30 years of cable manufacturing experience.
Our production scope includes low-voltage and medium-voltage power cables up to 35 kV, as well as control cables, overhead insulated cables and building wires.
For data center-related electrical infrastructure, our power cable solutions can be considered for applications such as:
- Low-voltage power distribution
- Medium-voltage power distribution
- Transformer connections
- Generator systems
- UPS-related power distribution
- Building electrical systems
- Industrial and commercial power networks
We can supply copper or aluminum conductor cables according to project requirements, with different insulation, sheath and construction options.
Our technical team can work with customers to confirm cable specifications, applicable standards, conductor size, cable construction and testing requirements before production.
For international projects, we also support customized specifications and project-based cable requirements.
13. Choosing the Right Cable for Your Data Center Project
There is no single "best" power cable for every data center.
The appropriate solution depends on the electrical system, voltage level, load, installation environment, fire requirements, local regulations and project specifications.
A reliable selection process should therefore start with the complete application rather than only the cable price.
For each cable, confirm:
Electrical requirements → Cable construction → Installation conditions → Applicable standards → Testing requirements → Packaging and delivery
This approach can help reduce technical misunderstandings and ensure that the supplied cable matches the actual requirements of the project.
Conclusion
Reliable power distribution is fundamental to data center operation. From medium-voltage incoming power to low-voltage distribution, UPS systems and backup generators, each cable must be selected according to its specific electrical and installation conditions.
XLPE power cables, copper and aluminum conductors, armored or non-armored constructions, and different fire-performance options can all be considered depending on the application.
For data center developers, EPC contractors, electrical contractors and cable distributors, working with a manufacturer that understands both technical requirements and international supply needs can make the procurement process more efficient.
NINGLAN Cable provides low- and medium-voltage power cable solutions up to 35 kV and supports customized cable specifications for different electrical applications.
Looking for power cables for a data center project? Contact NINGLAN Cable with your voltage level, conductor size, cable construction and applicable standard, and our team can review the requirements with you.
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