What is the largest size of CT?

The largest size of a current transformer (CT) is correctly identified as 1-1/2". This size is pertinent because current transformers are crucial in electrical systems for monitoring and measuring current levels. They provide scaled-down current outputs that can be safely measured by smaller instruments.

The dimensions of current transformers are determined by their application and the capacity they need to handle. A size of 1-1/2" indicates that they are designed for a certain range of current measurements, which makes them appropriate for many general electrical monitoring applications.

Some larger sizes exist, but when referring specifically to typical first-period insulator practices, 1-1/2" is commonly the maximum size used within that context before larger or specialized transformers are considered. Knowing the correct size is vital for ensuring compatibility with both installation and measurement equipment in electrical circuits.