AC current sensing with a CT

When current flows through a conductor, a magnetic field is created around the conductor. If the current is alternating (AC), a CT (Current Transformer), can be used to safely monitor the current.


The easiest way to measure and monitor AC current with the ezeio is to use a Current Transducer (CT) with a 0-5V DC output. Such transducers are available in sizes from 5A to 800A and for 1/4″ to 3″ diameter cables. Refer to our product pages or contact us for details.


Note that monitoring current in a AC circuit is not sufficient to calculate the actual power or energy – even if the voltage is known.


This is due to phase shifts that occur when the load is either inductive or capacitive. In practical installations very few loads are perfectly resistive, so that will cause the current and voltage to get out of phase.


To measure power/energy with any accuracy, an energy meter is required that monitors both current and voltage continuously. 


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