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clause, of IE 1956, minimum ground clearance of 33KV uninsulated electrical conductor is _________ meter.
Memorize IERule 77 base levels: Along street = 5.8 m, Across street = 6.1 m, Elsewhere/EHT base (>11 kV) = 5.2 m. Since 33 kV is the base high voltage limit before EHT additions, clearance is directly 5.2 m.
System Voltage = 33 kV, Overhead Line Type = Uninsulated / Bare conductor
Ground┬аClearance┬аfor┬а>11┬аkV=5.2┬аm
Memorize IERule 77 base levels: Along street = 5.8 m, Across street = 6.1 m, Elsewhere/EHT base (>11 kV) = 5.2 m. Since 33 kV is the base high voltage limit before EHT additions, clearance is directly 5.2 m.
Confusing clearances across a street (6.1 m) with general ground clearance elsewhere (5.2 m), or applying the extra 0.3 m per 33 kV rule above 33 kV instead of starting from 33 kV base.
Identify Relevant Regulation
According to Indian Electricity (IE) Rules 1956, Rule 77, specifications are defined for the minimum ground clearance of overhead transmission and distribution lines.
Rule┬а77┬аof┬аIE┬аRules┬а1956
Recall Standards for Lines Elsewhere than Across or Along Streets
For lines erected elsewhere than across or along any street, the minimum clearance for high voltage lines above 11┬аkV and up to 33┬аkV (uninsulated/bare conductor) is specified as 5.2┬аmeters.
Clearance┬аfor┬а33┬аkV=5.2┬аm
Formulate Minimum Clearance Calculation
For extra-high voltages exceeding 33┬аkV, additional clearance of 0.3┬аm is added for every additional 33┬аkV (or part thereof) over the base clearance of 5.2┬аm.
Clearance=5.2+0.3├Ч(33VтИТ33тАЛ)┬аm
Substitute System Voltage
Substitute V=33┬аkV into the equation: Clearance=5.2+0.3├Ч(3333тИТ33тАЛ)=5.2┬аm
Clearance=5.2┬аm
A is correct because as per Clause 77 of the Indian Electricity (IE) Rules 1956, the minimum ground clearance required for a 33 kV uninsulated conductor is 5.2 meters.
For competitive exams like SSC JE and State AE/JE, remember that vertical clearance from buildings (IERule 80) for 33┬аkV lines is 3.7┬аm, whereas ground clearance (IERule 77) is 5.2┬аm.