How to Install Current Transformers(CT)?

What is a Current Transformer?

A current transformer works in a different way to a voltage transformer. Instead of generating a voltage, it generates an output current in its secondary winding that is proportional to the current being measured in its primary winding.

How to Size a CT for Measuring Load

Before installing a CT, it's important to check that it's the correct size for the load you need to measure. This can be done by comparing its rated current with the maximum load you expect to connect to it.

How to Select the Right CT for Your Application

There are a number of different types of current transformers, and they all work differently in terms of how they can be used. For example, some CTs clamp around a wire and surround it with magnets to create an electric current in proportion to the amount of electricity flowing through it.

How to Connect a CT To an Electricity Meter

Once you've selected the right CT for your application, it's time to connect it to your power meter. Each CT comes with a set of lead wires that indicate which meter wire pair it should be connected to. If the leads are colored, you should use those colors to determine which wire pairs are positive and negative for the meter.

If you're unsure how to connect your CT, you can contact us and we'll be happy to assist you. In addition, we recommend checking the polarity of your current transformer to make sure it's oriented correctly for single and split-phase installations.