What is the effective value of a standard 2400 volt line?

The effective value of a standard 2400 volt line is 2400 volts because this figure represents the root mean square (RMS) voltage of the alternating current (AC) line. In AC systems, the RMS voltage is used to express the effective voltage value because it provides a measure of the voltage that would produce the same power dissipation in a resistive load as a direct current (DC) of the same value.

In the case of a 2400 volt line, this is the nominal voltage designation indicating that the line operates at this voltage level when measured in RMS terms. Therefore, the statement that the effective voltage of the line is 2400 volts aligns with how AC voltage is typically quantified and employed in electrical systems, making this answer accurate.

The other values do not represent the effective voltage of a 2400 volt line based on the definitions and standards typically used in electrical engineering and utility practices.