# Connecting Two 30x10mm2 Earth Busbars: Min. Conductor Cross Section

• Ivan001
In summary, the conversation discusses the minimal conductor cross section allowed for directly connecting two 30x10mm2 Earth busbars in a switchboard. It is recommended to use at least the same area as the bus bar and to avoid connecting Protective Earth and Neutral except at one point in the switchboard. Additionally, the fault rating of the system should be considered. There may also be a regional code for this.
Ivan001
I have two 30x10mm2 Earth busbars in switchboard, both are placed on insulators, but connected through various parts of switchboard (ground terminal, rails, door, mounting plate...) What is the minimal conductor cross section allowed for connecting this two busbars directly?

There may be a regional code for this - but I would use at least the same area as the bus bar.

Also - what is the fault rating of the system.

Ivan001 said:
I have two 30x10mm2 Earth busbars in switchboard, both are placed on insulators, but connected through various parts of switchboard (ground terminal, rails, door, mounting plate...)
Are you sure one of them is not a Neutral ?
Do not connect Protective Earth and Neutral except at the one point in the switchboard.

## 1. What is the purpose of connecting two 30x10mm2 Earth Busbars?

The purpose of connecting two 30x10mm2 Earth Busbars is to create a larger and more reliable grounding system. By connecting two busbars, you are increasing the surface area of the grounding system, which improves its ability to dissipate electrical currents and protect against electrical faults.

## 2. What is the minimum conductor cross section required for connecting two 30x10mm2 Earth Busbars?

The minimum conductor cross section required for connecting two 30x10mm2 Earth Busbars is determined by the amount of electrical current that needs to be carried through the connection. It is important to ensure that the conductor cross section is large enough to handle the maximum expected current without overheating or causing voltage drops.

## 3. How do I determine the appropriate conductor cross section for connecting two 30x10mm2 Earth Busbars?

The appropriate conductor cross section for connecting two 30x10mm2 Earth Busbars can be determined by consulting with electrical codes and standards, as well as performing calculations based on the expected current and length of the connection. It is recommended to consult with a qualified electrician or engineer for accurate calculations.

## 4. Can I use a smaller conductor cross section for connecting two 30x10mm2 Earth Busbars?

No, it is not recommended to use a smaller conductor cross section for connecting two 30x10mm2 Earth Busbars. Doing so can result in overheating, voltage drops, and potential safety hazards. It is important to use the appropriate conductor cross section to ensure the safe and efficient operation of the grounding system.

## 5. Are there any other factors to consider when connecting two 30x10mm2 Earth Busbars?

Yes, there are other factors to consider when connecting two 30x10mm2 Earth Busbars. These include the type of conductor material, the type of connection method (e.g. crimping, bolting), and the environment in which the connection will be made (e.g. temperature, moisture). It is important to follow all applicable codes and standards and use proper techniques to ensure a secure and reliable connection.

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