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thanks guys, all make sense now.

google just like other friends, they can betray u sometimes.... so basically, piggyback transformer is 2 transformers connecting in paralel and one of them (T2) is an isolating transformer (unity) as described in the quote above? And the reasong behind this is instead of using 1 transformer...

i have no idea. I've tried to search google and all i can get is this If I may ask a dumb question, what's an isolating transformer?

Hi guys, I came across the term "piggyback" transformer while doing a site inspection. I asked the site electrician what it is and he's got no idea. Can someone please tell me what exactly "piggyback" transformer is and what does it do? thx in advance