-Grounding protection is one of the measures to protect the basic safety has been applied for a long time. Protecting ground connection is connect all metal parts of the electrical equipment or of metal structures that can appear when the voltage of the damaged insulation with grounding system.-Grounding diagram choice is TN-C-S should we design the system neutral grounding resistor source. With Rndnguồn ≤ Rnđll ≤ 10 Ω, 4 Ω,
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