What AndyUK said about larger transformers tending to pop breakers and blow fuses due to high inrush current is right. The less is said about the time I was working on a DIY boost converter for my electronics course, and blew out the power to an entire wing of the YMCA I was living in, the better. That was back in mid 86 so they might have forgiven me now lol.

That was down to high inrush current as well.

But the good news is inrush current can be reduced pretty easily. See here...

http://www.ti.com/lit/an/slva670a/slva670a.pdf