DISTRIBUTION BOX
Attach a second grounding wire from the mounting plate (B), to the factory central grounding point. The ground resistance between all system parts shall be < 0.1 Ohm.
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Several Grounding Resistance Points
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The solidly-grounded and low-resistance grounded systems can also be implemented by using a grounding transformer, depending upon the amount of impedance connected in the neutral.
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Comparing Fault Resistance Coverage of Different Distribution System Grounding Methods Daqing Hou, Schweitzer Engineering Laboratories, Inc. ial plants use many types of
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Most common problems are open secondary neutral, load incorrectly connected to the ground wire instead of neutral, and connection of the ground wire to neutral at wrong locations.
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DISTRIBUTION BOX
Each DISTRIBUTION BOX and controller must be grounded. On the US market, a 5.26 mm 2 (10 AWG) ground wire must be used, and in all other markets a 6 mm 2 must be used.
Earth Fault Protection
For the line to ground fault shown in Figure 1, “3I0” is the total fault current. Fault current distribution, from the different system grounding points, can be derived from the distribution in the zero sequence