Will the standard Zig-Zag connection shown in the Acme General Catalog serve as an I-Trap™?

No. The I-Trap™ is specifically designed to reduce high neutral currents.

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To eliminate the problem of overheated neutral conductors, why not increase the size of the neutral?

First, increasing the neutral size does not eliminate the harmonic problem – they are still present in the system and may cause transformer overheating and possibly failure.

Second, installation of a new neutral conductor in long runs may be difficult and cost prohibitive when compared to the cost of installing an I-Trap™ unit.