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
