What Is the Required Cross-Section for Equipotential Link Conductors Above 250A?

In summary, it is stated in IEC that when exposed conductive parts do not have any devices or equipment fixed on them, a minimum 2.5 mm² conductor must be used for equipotential connection. However, for currents above 250A, the cross section is not specified. A 2016 Webinar on Grounding per IEC and NEC, starting on slide 38, suggests that the Grounding conductor should be no less than 1/2 the cross sectional area of the Phase conductors. Additionally, the requirements for a large RadioTelescope installation (ATACAMA) point to various standards.
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Ivan001
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When the exposed conductive parts (door, protective screen, closing panel, etc.) do not have any devices or equipment fixed on them, the equipotential connection of these exposed conductive parts must be provided using a conductor, minimum cross-section 2.5 mm² as it's stated in IEC (see picture). But, what is with the cross section for currents above 250A?
 

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Here is a slide show (PDF format) from a 2016 Webinar on Grounding per IEC and NEC. Grounding starts on slide 38. A quick look points to the Grounding conductor being no less than 1/2 the cross sectional area of the Phase conductors.

https://ias.ieee.org/images/files/W...IEC/Presentation_slides_understanding_NEC.pdf
And here are the requirements for a large RadioTelescope installation (ATACAMA) that points to many standards.

ftp://ftp.eso.org/projects/alma-23kv/SPE/applicable_documents_SPE/AD-109/SITE-20.00.00.00-024-A-SPE-1.pdf

Hope these at least point you to further info.

Cheers,
Tom
 
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Related to What Is the Required Cross-Section for Equipotential Link Conductors Above 250A?

1. What is an equipotential link conductor?

An equipotential link conductor is a piece of metal or other conductive material that is used to connect two or more points in an electrical system that have the same potential. It helps to ensure that all points in the system are at the same voltage, reducing the risk of electrical shock or damage to equipment.

2. Why is an equipotential link conductor important?

An equipotential link conductor is important because it helps to maintain the safety and functionality of an electrical system. By connecting all points at the same potential, it reduces the risk of electrical shock and damage to equipment, and helps to ensure that the system operates properly.

3. How is an equipotential link conductor installed?

An equipotential link conductor is typically installed by connecting it to a grounding point, such as a grounding rod or a metal water pipe. It should be installed in a way that ensures it has a low resistance path to ground, and it should be securely attached to all points that need to be connected.

4. What are the benefits of using an equipotential link conductor?

There are several benefits to using an equipotential link conductor. These include reducing the risk of electrical shock, preventing damage to equipment, and ensuring the proper functioning of the electrical system. It can also help to prevent interference between different electrical systems.

5. Are there any safety considerations when using an equipotential link conductor?

Yes, there are some safety considerations to keep in mind when using an equipotential link conductor. It is important to ensure that it is properly installed and securely attached to all points that need to be connected. It should also be regularly inspected and maintained to ensure it is functioning properly. Additionally, it is important to follow all safety protocols and guidelines when working with electrical systems.

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