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The voltage between any two phases of a 400 V, 3 phase, 3 wire system is
220 V
110 V
400 V
250 V
400 V
In a 3-phase system, the stated voltage (e.g., 400 V) refers to the line-to-line voltage (VLтАЛ), which is the potential difference between any two phases. A 3-wire system configuration transmits this line voltage to the load without a neutral conductor.
In a 3-phase system, the stated voltage (e.g., 400 V) refers to the line-to-line voltage (VLтАЛ), which is the potential difference between any two phases. A 3-wire system configuration transmits this line voltage to the load without a neutral conductor.
VLтАЛ=3тАЛVphтАЛ тАФ Relationship in Star Connection
VLтАЛ=VphтАЛ тАФ Relationship in Delta Connection
In a star or delta connected 3-phase system, the voltage measured across any two lines is the line voltage. For a balanced system, the line voltage is constant across all three pairs of phases (VRYтАЛ=VYBтАЛ=VBRтАЛ=400V). This is the standard voltage level used for industrial power distribution in India.
The 400 V rating in a 3-phase, 3-wire system is the nominal line voltage.
A 3-wire system typically consists of R, Y, and B phases without a neutral wire.
Line voltage is the voltage between any two phases of a supply system.
Efficient power transmission with reduced conductor material.
Constant power delivery for industrial motors and equipment.
Requires balancing of loads to prevent neutral current (if a neutral existed).
High potential difference increases insulation requirements.
Industrial motor drives
High-power heating elements
Secondary distribution substations
In India, the standard low-voltage 3-phase supply is 415 V line-to-line, but 400 V is frequently cited in theoretical contexts.
Option A (220 V) usually refers to the phase voltage (VphтАЛ=VLтАЛ/3тАЛ) in a star system.
C is correct тАФ In any 3-phase system, the specified system voltage of 400 V represents the line-to-line voltage measured between any two phase conductors.
Always verify if the question asks for line voltage or phase voltage; remember that for Star connections, VLтАЛ=3тАЛVphтАЛ.