I find this thread to be very interesting because there are some valid points made by all. iWire's UL references are some I'd not looked at before, about the way UL sees "relocatable power strips".
As for article 400, there is no way that "Uses Permitted" could be all inclusive and I've seen many ways people have safely used these devices. I've also seen them abused by daisy chaining etc.
As for permanently installed, it gets done all the time with UL's blessing by virtue of the fact that most of them come with tabs, ears or slots for mounting. Just to drift for one moment, the code does frown on using cord and cap connection plugged into track lighting. Forgot the article but it's there (I think).
