Installing a current transformer on a conductor that is too large for the window means that the CT will not be able to close properly, producing incorrect readings. In additional to current rating, a CTs physical size is important to consider. At lower than 5A, the CT will not be as accurate and at higher than 120A, the CT may begin to saturate which will, again, product inaccurate readings. This means that if the rated current for a CT is 100A, it can be used on services from 5A to 120A. In most cases, a CT remains at its specified accuracy from 5% to 120% of its rated current. The rated current indicates the amperage that can be measured by a particular CT. There are two key factors in sizing a CT: the rated current and the physical size.

Project parameters are constantly evolving, so before current transformer installation, it’s important to verify the CTs on hand are still a good choice for your application and that they are correctly sized for the load you wish to measure.

Keep in mind that current transformer and meter installation should always be completed by a trained, qualified professional and follow all local electrical codes. Even if your project doesn’t rely on revenue grade accuracy to be successful, there are simple steps that you can take to ensure that current transformer installation goes smoothly and that you are maximizing performance. Next, it’s time to consider the current transformer installation process. You’ve thoroughly researched submeters, current transformers, and communications options to determine the perfect equipment for your project. How to Install Current Transformers? Tips for Properly Installing Current Transformers to Maximize Results

Transformer color code wire