The selection between a 480V, 3-phase and a 400V, 3-phase voltage system for industrial applications depends on various factors and specific requirements. Here are some key considerations and potential advantages of each system

480V, 3-phase system:
Higher power capacity

A 480V system provides a higher voltage, allowing for transmission of more power through smaller conductors than a 400V system. This can be advantageous for applications requiring high power loads or long cable runs.

Reduced voltage drop

The higher voltage results in less voltage drop over long distances, which can improve efficiency and reduce the need for excessive voltage compensation.

Availability of standard equipment

480V is a commonly used voltage in North America, and a wide range of standard electrical equipment and components are available for this voltage level.

Increased safety

A higher voltage system can reduce the risk of electrical shocks and short circuits, especially in environments with high humidity or potential grounding issues.

400V, 3-phase system



Lower voltage

A 400V system operates at a lower voltage, which can be safer to handle and may require less insulation and protective measures.

Harmonization with international standards

400V is a common voltage level used in many countries outside of North America, which can simplify equipment standardization and compatibility.

Lower cost of equipment

In some cases, electrical equipment designed for 400V may be less expensive than equipment rated for 480V.

Additional Considerations



Load requirements

The specific power demands of the industrial application will influence the voltage system selection. High-power loads may benefit from a 480V system, while lower-power loads may operate efficiently with a 400V system.

Code and regulations

Local building codes and electrical standards may specify preferred or required voltage levels for certain types of industrial facilities or applications. It's crucial to adhere to these regulations for safety and compliance.

Existing infrastructure: If an existing industrial site has established electrical infrastructure, it may be more cost-effective to maintain the existing voltage system rather than converting to a different voltage level.Ultimately, the decision between 480V and 400V for an industrial application should be based on a thorough evaluation of the factors mentioned above, including power requirements, safety considerations, cost, and compatibility with existing infrastructure and international standards. Flag for review