Regarding "Earthing" requirements as per Indian standards, consider the following:
1. The earth neutral conductor shall be earthed at the source and at each point of supply.
2. The resistance of the earth connection should be as high as possible for safety.
3. Periodic testing of earth pits is a mandatory safety requirement.
Which of the statements given above is/are correct?
Answer & step-by-step solution
Protective earthing provides a low-impedance path for fault current and stabilizes exposed conductive parts/neutral references. Earth resistance should be low enough to meet protection requirements and is checked periodically because soil/moisture/corrosion can change electrode performance. Key relation: Touch voltage and disconnection time depend on earthing and protective-device coordination.
Exam focus: Low earth resistance is desirable—not high resistance. Common trap: Never state that high earth resistance improves safety.
Statement-wise Verification
- Statement 1 - Correct.
The earth neutral conductor shall be earthed at the source and at each point of supply.
Low earth resistance is desirable—not high resistance. - Statement 2 - Incorrect.
The resistance of the earth connection should be as high as possible for safety.
Protective earthing seeks sufficiently low resistance/impedance so fault current can operate protection and touch voltage is limited - Statement 3 - Correct.
Periodic testing of earth pits is a mandatory safety requirement.
Low earth resistance is desirable—not high resistance.
Core Concept
Protective earthing provides a low-impedance path for fault current and stabilizes exposed conductive parts/neutral references. Earth resistance should be low enough to meet protection requirements and is checked periodically because soil/moisture/corrosion can change electrode performance.
Formula / Key Relationship
Touch voltage and disconnection time depend on earthing and protective-device coordination.
Why the Other Options Are Wrong
Option B is incorrect because it includes incorrect statement(s) 2 and omits correct statement(s) 1. Option C is incorrect because it includes incorrect statement(s) 2 and omits correct statement(s) 3. Option D is incorrect because it includes incorrect statement(s) 2.
Exam Shortcut / Approach
Low earth resistance is desirable—not high resistance.
Common Mistake
Never state that high earth resistance improves safety.
Quick Revision
Neutral Earthing and Earth Resistance Testing is linked with Earthing Requirements, Earthing and Electrical Safety. Low earth resistance is desirable—not high resistance.
भारतीय मानकों के अनुसार "अर्थिंग" आवश्यकताओं के संबंध में निम्नलिखित पर विचार कीजिए:
1. अर्थ न्यूट्रल चालक को स्रोत पर और आपूर्ति के प्रत्येक बिंदु पर अर्थ किया जाएगा।
2. सुरक्षा के लिए अर्थ कनेक्शन का प्रतिरोध जितना संभव हो उतना अधिक होना चाहिए।
3. अर्थ पिट की आवधिक जाँच एक अनिवार्य सुरक्षा आवश्यकता है।
ऊपर दिए गए कथनों में से कौन-सा/से सही है/हैं?
उत्तर और चरणबद्ध हल
A — केवल 1 और 3। प्रोटेक्टिव अर्थिंग फॉल्ट धारा के लिए कम-प्रतिबाधा पथ देती है; अर्थ प्रतिरोध कम होना चाहिए और इसकी समय-समय पर जाँच होती है क्योंकि मिट्टी/नमी/जंग से इलेक्ट्रोड प्रदर्शन बदलता है। उच्च अर्थ प्रतिरोध सुरक्षा नहीं बढ़ाता।
विस्तृत हल (मूल भाषा में)
Statement-wise Verification
- Statement 1 - Correct.
The earth neutral conductor shall be earthed at the source and at each point of supply.
Low earth resistance is desirable—not high resistance. - Statement 2 - Incorrect.
The resistance of the earth connection should be as high as possible for safety.
Protective earthing seeks sufficiently low resistance/impedance so fault current can operate protection and touch voltage is limited - Statement 3 - Correct.
Periodic testing of earth pits is a mandatory safety requirement.
Low earth resistance is desirable—not high resistance.
Core Concept
Protective earthing provides a low-impedance path for fault current and stabilizes exposed conductive parts/neutral references. Earth resistance should be low enough to meet protection requirements and is checked periodically because soil/moisture/corrosion can change electrode performance.
Formula / Key Relationship
Touch voltage and disconnection time depend on earthing and protective-device coordination.
Why the Other Options Are Wrong
Option B is incorrect because it includes incorrect statement(s) 2 and omits correct statement(s) 1. Option C is incorrect because it includes incorrect statement(s) 2 and omits correct statement(s) 3. Option D is incorrect because it includes incorrect statement(s) 2.
Exam Shortcut / Approach
Low earth resistance is desirable—not high resistance.
Common Mistake
Never state that high earth resistance improves safety.
Quick Revision
Neutral Earthing and Earth Resistance Testing is linked with Earthing Requirements, Earthing and Electrical Safety. Low earth resistance is desirable—not high resistance.
ભારતીય ધોરણો મુજબ "અર્થિંગ" જરૂરિયાતો અંગે નીચેનું ધ્યાનમાં લો:
1. અર્થ ન્યુટ્રલ વાહકને સ્રોત પર અને પુરવઠાના દરેક બિંદુએ અર્થ કરવો જોઈએ.
2. સલામતી માટે અર્થ જોડાણનો અવરોધ શક્ય તેટલો વધુ હોવો જોઈએ.
3. અર્થ પિટની સમયાંતરે ચકાસણી ફરજિયાત સલામતી જરૂરિયાત છે.
ઉપર આપેલાં વિધાનોમાંથી કયું/કયાં સાચું/સાચાં છે?
જવાબ અને પગલાવાર ઉકેલ
A — ફક્ત 1 અને 3. પ્રોટેક્ટિવ અર્થિંગ ફોલ્ટ પ્રવાહ માટે ઓછા અવબાધનો માર્ગ આપે છે; અર્થ અવરોધ ઓછો હોવો જોઈએ અને તેની સમયાંતરે ચકાસણી થાય છે કારણ કે જમીન/ભેજ/કાટથી ઇલેક્ટ્રોડની કામગીરી બદલાય છે. ઊંચો અર્થ અવરોધ સલામતી વધારતો નથી.
વિગતવાર ઉકેલ (મૂળ ભાષામાં)
Statement-wise Verification
- Statement 1 - Correct.
The earth neutral conductor shall be earthed at the source and at each point of supply.
Low earth resistance is desirable—not high resistance. - Statement 2 - Incorrect.
The resistance of the earth connection should be as high as possible for safety.
Protective earthing seeks sufficiently low resistance/impedance so fault current can operate protection and touch voltage is limited - Statement 3 - Correct.
Periodic testing of earth pits is a mandatory safety requirement.
Low earth resistance is desirable—not high resistance.
Core Concept
Protective earthing provides a low-impedance path for fault current and stabilizes exposed conductive parts/neutral references. Earth resistance should be low enough to meet protection requirements and is checked periodically because soil/moisture/corrosion can change electrode performance.
Formula / Key Relationship
Touch voltage and disconnection time depend on earthing and protective-device coordination.
Why the Other Options Are Wrong
Option B is incorrect because it includes incorrect statement(s) 2 and omits correct statement(s) 1. Option C is incorrect because it includes incorrect statement(s) 2 and omits correct statement(s) 3. Option D is incorrect because it includes incorrect statement(s) 2.
Exam Shortcut / Approach
Low earth resistance is desirable—not high resistance.
Common Mistake
Never state that high earth resistance improves safety.
Quick Revision
Neutral Earthing and Earth Resistance Testing is linked with Earthing Requirements, Earthing and Electrical Safety. Low earth resistance is desirable—not high resistance.
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