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This question needs some more information. The obvious answer would be that there is no load, thus no work being done which equals no current. There is also the possibility that the clamp meter is across all three phases simultaneously (i.e. a multiconductor cable) which under the correct conditions might not show a cummulative current of zero (each current phase is 120 degrees out of phase. using vector math concludes a cummulative current of 0), or the conductor is shielded not allowing the measurement of the electrical fields. This assuming the clamp meter is measuring a self generated interference signal to measure the fluctuations in the electrical field of the conductor.
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What will happen if we use current transformer of different rating for each phase in three phase supply?
A current transformer has to have the same ratio as the meter that it drives. Full scale deflection on the meter is 5 amps which equals the maximum allowed current on the phase that it is reading. A different ratio on the CT to meter would show an erroneous reading on the meter depending on the ratio of the connected CT. To keep costs down the meter is common to all three phases and is read by connecting the meter to the phase CT through a three position switch.
What is it that shows whether or not a current flows?
An amp meter connected in series with the load will show whether or not a current is flowing in a circuit.
What is wrong with your single phase electricity meter if it does not show any numbers in the meter reading panel?
One of the conditions that would cause this is that there is no supply voltage to the top of the meter. Another problem could be, the neutral tickler wire has become disconnected.
What is the ohmmeter reading for open circuit?
The capacitor has no resistance which your direct current ohm meter can show.
Show you a diagram fo a delta connection?
Show digram 3 phase motor 110 and 220
