The charts below detail the Earth Loop impedance (Zs) for the Tesys U range for any TN system based on the British Standard BS7671:2008+A3:2015
Two documents are also attached:
1) Sheet with Zs charts of Tesys motor circuit breakers (MPCB's):
- Tesys GV2
- Tesys GV3
- Tesys GV4
- Tesys GV7
- Tesys U
This also includes additional information about:
- Motor Rated devices
- Ambient Temperature
Tesys U Range
Please refer to the charts below that detail the maximum earth loop impedance Zs for 0.4s disconnection time with Uo 230V
| Tesys U | ||||
| Reference | Thermal Adjustment Range In (A) | Magnetic Tripping Current Im (A) | Tolerance Im+20% (A) | Maximum Loop Impedance Zs (Ω) |
| LUC*X6** | 0.15 .. 0.6 | 8.52 | 10.22 | 21.37 |
| LUC*1X** | 0.35 .. 1.4 | 19.88 | 23.86 | 9.16 |
| LUC*05** | 1.25 .. 5.0 | 71.00 | 85.20 | 2.56 |
| LUC*12** | 3 .. 12 | 170.4 | 204.48 | 1.07 |
| LUC*18** | 4.5 .. 18 | 255.6 | 306.7 | 0.71 |
| LUC*32** | 8 .. 32 | 454.4 | 545 | 0.40 |
| LUC*38** | 9.5..38 | 539.6 | 647.52 | 0.34 |