James is correct, the primary reason should be that they are not listed for the purpose of landscape lighting. In Canada at least, that is a big deal for our electrical authorities.
Why they are not and cannot be listed as landscape lighting transformers, is because there is no electrical isolation between the primary and secondary windings...they use a continuous winding. Landscape lighting transformers have to be electrically isolated. And in order to be used for water features, must also have a ground shield (Faraday shield) between the primary and secondary coils.
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