The UL White Book lists these gizmos as "Relocatable Power Taps (XBYS)"

They are intended to plug "directly into a permanently installed branch circuit receptacle"
They are "not intended to be series connected (daisy chained) to other relocatable power taps or extension cords."
Additionally, the aren't to be permanently attached to anything (workbench, desk, etc), and can't be used on construction sites (although I sure see lots of them used on sites for battery chargers, big dumb radios, and the like).

Thanks to Joe, and ECN, we've all got easy access to this kind of info. I never would have dreamed of finding something like this in the past. Pay attention, it pays...S

[This message has been edited by electure (edited 01-18-2004).]