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What does the ``C`` prefix indicate on a transformer catalog numbers such as C30T79H?

The ``C`` prefix indicates a unit that was designed for the Canadian market. The unit is UL certified to conform to Canadian Standard C22.2 No. 47-M90. ``C`` prefix units are no longer offered by Square D because the entire low voltage dry type distribution transformer line is now cULus labeled, which conforms to both UL and CSA standards.


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