Many meter manufacturers and others ask why use a Magnelab standard, pre-burdened voltage output current transformer (CT) for monitoring power instead of the traditional 5 amp output current transformer (CT) that's been used for decades. There are several similarities and differences between the two CT types--the similarities are that both CT's operate under the same principles of magnetic theory, they both provide isolation between the primary and secondary conductors, and both generally use a single turn primary winding. Because the differences are more complex, I'll expand on the characteristics of each.
