Support
Search FAQs
FA142074
How can we help you today?

What is the maximum earth fault loop impedance Zs for the TeSys Ultra? What values are taken into consideration to calculate the Zs values?

The charts below detail the earth loop impedance (Zs) for the TeSys Ultra range for any TN system based on BS7671:2008+A3:2015

Two documents are also attached:


1) Zs tables of TeSys motor circuit breakers:

  • TeSys GV2
  • TeSys GV3
  • TeSys GV4
  • TeSys GV7
  • TeSys U

2) Explanation of the calculation of the maximum earth loop impedance. This also includes additional information about:

  • Motor rated devices
  • Ambient temperature


Please refer to the table below which details the maximum earth loop impedance (Zs) for 0.4s disconnection time with Uo 230V

Zs values table for TeSys Ultra

Updated TeSys starter picture - colour change

Released for: Schneider Electric UK

Attachment(s)
Tesys Zs Values.pdf [139.87 KB]
Zs v201810.pdf [456.56 KB]
Explore more
Range:
TeSys Ultra
Users group

Discuss this topic with experts

Visit our community and get advice from experts and peers on this topic and more
Explore more
Range:
TeSys Ultra
  • Products Documentation
  • Software Downloads
  • Product Selector
  • Product Substitution and Replacement
  • Help and contact centre
  • Where to buy
  • Get a Quote
  • Find our Offices
  • Schneider Electric Community
  • Careers
  • Company Profile
  • Report a misconduct
  • Accessibility
  • Newsroom
  • Investors
  • EcoStruxure
  • Job Search
  • Blog
  • Privacy Policy
  • Cookie Notice
  • Terms of use
  • Change your cookie settings