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5,621 Posts
Most PTs I have seen are rated at a "burden" (maximum load without affecting accuracy) of between 25 and 100 watts, not VA, but watts. I have never seen one rated 500VA, but that's just me, I'm not really that deep into the utility side of things. But certainly, someone feeding a "100A panel with a few single phase 15A loads" was overstepping the boundaries of sound practice in my opinion. PTs are NOT made for that.
