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How many earthing leads provides in public building?
5
2
1
3
2
According to the Indian Electricity (IE) Rules, for public buildings, hospitals, and large establishments, a minimum of two separate earthing leads (electrodes) are mandated to ensure system reliability and safety. This redundancy ensures that if one earthing path fails or exhibits high resistance, the other remains functional to protect against leakage currents.
According to the Indian Electricity (IE) Rules, for public buildings, hospitals, and large establishments, a minimum of two separate earthing leads (electrodes) are mandated to ensure system reliability and safety. This redundancy ensures that if one earthing path fails or exhibits high resistance, the other remains functional to protect against leakage currents.
RtotalтАЛ=R1тАЛ+R2тАЛR1тАЛтЛЕR2тАЛтАЛ тАФ Parallel equivalent resistance for dual electrodes
The principle relies on providing redundant parallel paths for fault currents to return to the earth. In a dual-earthing arrangement, two independent electrodes are connected to the main earthing bus bar. This setup significantly reduces the overall contact resistance (RtotalтАЛ=R1тАЛ+R2тАЛR1тАЛ├ЧR2тАЛтАЛ) and guarantees a low-impedance path even if soil moisture levels fluctuate near one electrode.
Redundancy is critical for public safety in high-occupancy buildings.
IE Rules specify that earthing must be robust enough to handle the maximum fault current of the system.
Dual earthing minimizes the risk of 'floating' potential if one ground connection corrodes.
Regular testing of both electrodes is required for compliance.
Increased system reliability
Lower ground path impedance
Compliance with safety regulations
Higher initial installation cost
Requires more physical space for electrode separation
Hospitals
Public Auditoriums
Government Buildings
Educational Institutions
The dual earthing requirement is stipulated to ensure that leakage current does not rise to a level capable of causing shock to humans.
In industrial setups, this number may increase depending on the connected load and fault level calculations.
B is correct тАФ Public buildings require at least two independent earthing leads to ensure safety through redundancy.
Always remember that while single earthing is common for residential homes, IE Rules emphasize higher safety coefficients (N тЙе 2) for any structure classified as a public building to mitigate risk.