Consider the following regarding Earth Leakage Protection:
1. An ELCB (Earth Leakage Circuit Breaker) detects small leakage currents to the earth.
2. Voltage-operated ELCBs are preferred over current-operated RCCBs in modern installations.
3. A 30mA RCCB is generally used for personal protection against electric shock.
Which of the statements given above is/are correct?
Answer & step-by-step solution
An RCCB/RCD detects imbalance between live and neutral currents caused by leakage to earth and is used for shock protection. An MCB protects conductors against overload and short circuit. Key relation: Typical additional personal protection uses 30 mA RCD/RCCB.
Exam focus: RCCB → leakage; MCB → overcurrent; SPD → transient surge. Common trap: Do not expect an RCCB alone to provide overload protection.
Statement-wise Verification
- Statement 1 - Correct.
An ELCB (Earth Leakage Circuit Breaker) detects small leakage currents to the earth.
An RCCB/RCD detects imbalance between live and neutral currents caused by leakage to earth and is used for shock protection. - Statement 2 - Incorrect.
Voltage-operated ELCBs are preferred over current-operated RCCBs in modern installations.
Modern installations prefer current-operated RCCBs/RCDs because they directly sense residual current and are more comprehensive - Statement 3 - Correct.
A 30mA RCCB is generally used for personal protection against electric shock.
An RCCB/RCD detects imbalance between live and neutral currents caused by leakage to earth and is used for shock protection.
Core Concept
An RCCB/RCD detects imbalance between live and neutral currents caused by leakage to earth and is used for shock protection. An MCB protects conductors against overload and short circuit. Surge protective devices clamp short-duration transient overvoltages; they are not intended to regulate sustained overvoltage.
Formula / Key Relationship
Typical additional personal protection uses 30 mA RCD/RCCB.
Why the Other Options Are Wrong
Option A is incorrect because it includes incorrect statement(s) 2 and omits correct statement(s) 3. Option C is incorrect because it includes incorrect statement(s) 2 and omits correct statement(s) 1. Option D is incorrect because it includes incorrect statement(s) 2.
Exam Shortcut / Approach
RCCB → leakage; MCB → overcurrent; SPD → transient surge.
Common Mistake
Do not expect an RCCB alone to provide overload protection.
Quick Revision
30 mA Personal Protection is linked with ELCB and RCCB, Earth Leakage Protection and Electrical Safety. RCCB → leakage; MCB → overcurrent; SPD → transient surge.
अर्थ लीकेज सुरक्षा के संबंध में निम्नलिखित पर विचार कीजिए:
1. ELCB (Earth Leakage Circuit Breaker) अर्थ की ओर छोटी लीकेज धाराओं का पता लगाता है।
2. आधुनिक संस्थापनों में वोल्टेज-संचालित ELCB को धारा-संचालित RCCB से अधिक पसंद किया जाता है।
3. विद्युत झटके से व्यक्तिगत सुरक्षा के लिए सामान्यतः 30mA RCCB का उपयोग होता है।
ऊपर दिए गए कथनों में से कौन-सा/से सही है/हैं?
उत्तर और चरणबद्ध हल
B — केवल 1 और 3। ELCB/RCCB अर्थ लीकेज पकड़ते हैं और व्यक्तिगत सुरक्षा के लिए 30 mA RCCB सामान्य है। आधुनिक संस्थापनों में धारा-संचालित RCCB/RCD को वोल्टेज-संचालित ELCB से अधिक पसंद किया जाता है।
विस्तृत हल (मूल भाषा में)
Statement-wise Verification
- Statement 1 - Correct.
An ELCB (Earth Leakage Circuit Breaker) detects small leakage currents to the earth.
An RCCB/RCD detects imbalance between live and neutral currents caused by leakage to earth and is used for shock protection. - Statement 2 - Incorrect.
Voltage-operated ELCBs are preferred over current-operated RCCBs in modern installations.
Modern installations prefer current-operated RCCBs/RCDs because they directly sense residual current and are more comprehensive - Statement 3 - Correct.
A 30mA RCCB is generally used for personal protection against electric shock.
An RCCB/RCD detects imbalance between live and neutral currents caused by leakage to earth and is used for shock protection.
Core Concept
An RCCB/RCD detects imbalance between live and neutral currents caused by leakage to earth and is used for shock protection. An MCB protects conductors against overload and short circuit. Surge protective devices clamp short-duration transient overvoltages; they are not intended to regulate sustained overvoltage.
Formula / Key Relationship
Typical additional personal protection uses 30 mA RCD/RCCB.
Why the Other Options Are Wrong
Option A is incorrect because it includes incorrect statement(s) 2 and omits correct statement(s) 3. Option C is incorrect because it includes incorrect statement(s) 2 and omits correct statement(s) 1. Option D is incorrect because it includes incorrect statement(s) 2.
Exam Shortcut / Approach
RCCB → leakage; MCB → overcurrent; SPD → transient surge.
Common Mistake
Do not expect an RCCB alone to provide overload protection.
Quick Revision
30 mA Personal Protection is linked with ELCB and RCCB, Earth Leakage Protection and Electrical Safety. RCCB → leakage; MCB → overcurrent; SPD → transient surge.
અર્થ લીકેજ રક્ષણ અંગે નીચેનું ધ્યાનમાં લો:
1. ELCB (Earth Leakage Circuit Breaker) અર્થ તરફના નાના લીકેજ પ્રવાહો શોધે છે.
2. આધુનિક સ્થાપનોમાં વોલ્ટેજ-સંચાલિત ELCBને પ્રવાહ-સંચાલિત RCCB કરતાં વધુ પસંદ કરાય છે.
3. વિદ્યુત આંચકા સામે વ્યક્તિગત રક્ષણ માટે સામાન્ય રીતે 30mA RCCB વપરાય છે.
ઉપર આપેલાં વિધાનોમાંથી કયું/કયાં સાચું/સાચાં છે?
જવાબ અને પગલાવાર ઉકેલ
B — ફક્ત 1 અને 3. ELCB/RCCB અર્થ લીકેજ પકડે છે અને વ્યક્તિગત રક્ષણ માટે 30 mA RCCB સામાન્ય છે. આધુનિક સ્થાપનોમાં પ્રવાહ-સંચાલિત RCCB/RCDને વોલ્ટેજ-સંચાલિત ELCB કરતાં વધુ પસંદ કરાય છે.
વિગતવાર ઉકેલ (મૂળ ભાષામાં)
Statement-wise Verification
- Statement 1 - Correct.
An ELCB (Earth Leakage Circuit Breaker) detects small leakage currents to the earth.
An RCCB/RCD detects imbalance between live and neutral currents caused by leakage to earth and is used for shock protection. - Statement 2 - Incorrect.
Voltage-operated ELCBs are preferred over current-operated RCCBs in modern installations.
Modern installations prefer current-operated RCCBs/RCDs because they directly sense residual current and are more comprehensive - Statement 3 - Correct.
A 30mA RCCB is generally used for personal protection against electric shock.
An RCCB/RCD detects imbalance between live and neutral currents caused by leakage to earth and is used for shock protection.
Core Concept
An RCCB/RCD detects imbalance between live and neutral currents caused by leakage to earth and is used for shock protection. An MCB protects conductors against overload and short circuit. Surge protective devices clamp short-duration transient overvoltages; they are not intended to regulate sustained overvoltage.
Formula / Key Relationship
Typical additional personal protection uses 30 mA RCD/RCCB.
Why the Other Options Are Wrong
Option A is incorrect because it includes incorrect statement(s) 2 and omits correct statement(s) 3. Option C is incorrect because it includes incorrect statement(s) 2 and omits correct statement(s) 1. Option D is incorrect because it includes incorrect statement(s) 2.
Exam Shortcut / Approach
RCCB → leakage; MCB → overcurrent; SPD → transient surge.
Common Mistake
Do not expect an RCCB alone to provide overload protection.
Quick Revision
30 mA Personal Protection is linked with ELCB and RCCB, Earth Leakage Protection and Electrical Safety. RCCB → leakage; MCB → overcurrent; SPD → transient surge.
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