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

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SUMMARY

The discussion centers on the minimum conductor cross-section required for connecting two 30x10mm² Earth busbars in a switchboard. It is established that the conductor cross-section should match the area of the busbars, ensuring compliance with regional codes. Additionally, participants emphasize the importance of not connecting Protective Earth and Neutral except at a single designated point within the switchboard to maintain system integrity and safety.

PREREQUISITES
  • Understanding of electrical busbar configurations
  • Knowledge of regional electrical codes and standards
  • Familiarity with grounding and neutral systems in electrical installations
  • Basic principles of fault rating in electrical systems
NEXT STEPS
  • Research regional electrical codes regarding busbar connections
  • Learn about the implications of connecting Protective Earth and Neutral
  • Investigate fault rating calculations for switchboard systems
  • Explore best practices for grounding in electrical installations
USEFUL FOR

Electrical engineers, electricians, and safety inspectors involved in switchboard design and installation, particularly those focusing on grounding and busbar systems.

Ivan001
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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?
 
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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.
 

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