अर्थिंग (भू-संयोजन) अर्थ (Earth) तथा ग्राउंड (Ground) दोनों ही शब्द अंग्रेजी भाषा के हैं जिनका सामान्य मतलब (निष्कर्ष) हिन्दी के शब्द – भू, भूमि, धरा, जमीन, मिट्टी, पृथ्वी, धरती, छिति से ही है । अर्थिंग (ग्राउंडिंग) का तात्पर्य भूमि से संपर्क करना होता है जिसे भू-सम्पर्कन/भू-संयोजन कहते हैं । अर्थिंग व्यवस्था वह साधन है जिससे विद्युत उपकरण सुरक्षित रहते हैं तथा मानव, जीवधारी और सम्पत्ति भी सुरक्षित रहते हैं ।
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