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TV 450/455 Earth resistance
50
5.7 Earth resistance
Earth resistance is one of the most important parameters for protection against electric
shock. Main earthing arrangements, lightning systems, local earthings, etc can be
verified with the earthing resistance test. The measurement conforms to the EN 61557-
5 standard.
See chapter 4.1 Function selection for instructions on
key functionality.
Figure 5.32: Earth resistance
Test parameters for earth resistance measurement
Limit
Maximum resistance OFF, 1 Ω ÷ 5 kΩ
Connections for earth resistance measurement
Figure 5.33: Resistance to earth, measurement of main installation earthing
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