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Standard domestic AC supply voltage in India is
220 V
230 V
240 V
250 V
230 V
In India, the standard domestic AC supply voltage is defined as 230 V RMS (Root Mean Square) at a frequency of 50 Hz. This is governed by the Bureau of Indian Standards (BIS) under IS 12360:1988 for low voltage electrical installations.
In India, the standard domestic AC supply voltage is defined as 230 V RMS (Root Mean Square) at a frequency of 50 Hz. This is governed by the Bureau of Indian Standards (BIS) under IS 12360:1988 for low voltage electrical installations.
VphтАЛ=3тАЛVLтАЛтАЛ тАФ Relation between line voltage and phase voltage in a star-connected system
VRMSтАЛ=2тАЛVpeakтАЛтАЛ тАФ Conversion from peak voltage to RMS voltage
The electrical distribution system in India utilizes a three-phase four-wire system. The 230 V supply is obtained as the phase-to-neutral voltage (VphтАЛ), derived from a 400 V three-phase supply (VLтАЛ=400┬аV) such that VphтАЛ=3тАЛVLтАЛтАЛтЙИ231┬аV.
Nominal voltage in India is 230 V, though historical references sometimes mention 220 V/240 V.
The standard supply frequency is 50 Hz (cycles per second).
Adherence to these standards is essential for the safety and longevity of electrical appliances.
Voltage tolerance typically ranges between +6% and -10%.
Uniformity in appliance manufacturing
Efficient power transmission and distribution
Potential for damage to appliances if voltage fluctuates outside defined limits
Requires constant monitoring by utility providers
Residential lighting and power sockets
Small-scale domestic appliances
Commercial office equipment
Prior to the adoption of 230 V as the formal national standard, 220 V and 240 V were commonly used in different regions. IS 12360 normalized this to 230 V to align with international IEC standards.
The '220 V' option is often considered historically correct but is technically superseded by the current 230 V standard.
B is correct тАФ The standard nominal domestic supply voltage in India is 230 V RMS at 50 Hz.
Always remember that in India, the frequency is 50 Hz; if you see 60 Hz in an MCQ, it is typically referring to systems like those in the USA.