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).]
I often run into a prediciment when doing business license inspections. People will have extension cords all over the place and I turn them down. Usually I come back and see (1) power strip installed to resolve the issue. I'm happy.
The problem is when they do what is pictured above. When the alternative is to supply additional receptacles at a cost that may not be an option to the small business owner, is this really that big of a problem?
Always a bit sad to see something like this. The things people will do to avoid coughing up the dollars for those extra outlets. I suppose on the plus side at least some of them now have over current or thermal trips built into them.....
It seems to be wide spread with the worst I've seen being under a computer room floor where two were daisy chained into a third, this third one daisey chained with a forth one into a fifth which finally went into the wall.
Lastly, the wiring and the standard they are built to are for small amperage loads connected to each receptacle. Daisy chaining them concentrates the loading to one receptacle which is not designed for the concentrated load. The device as a whole is often protected against over current; but each receptacle is not, being considered a tap.
We have had reports of fires with these of the surge protector type when daisy chained, though I do not know the details.
the wiring and the standard they are built to are for small amperage loads connected to each receptacle. Daisy chaining them concentrates the loading to one receptacle which is not designed for the concentrated load. The device as a whole is often protected against over current; but each receptacle is not, being considered a tap.
Suppose someone plugs in a kilowatt space heater in one of the outlets, and nothing in the others. Its circuit breaker would allow the current, but would the individual outlet be overloaded? Essentially the strip closest to the power source in a daisy chain would see a similar effect, lots of cuurrent in one outlet, light loading on the others. I would avoid daisy chaining because of all the voltage drop losses incurred from all those outlet/plug connections. Similar to those office cubicle wiring systems with all the jumpers and sockets. We had one burn badly out years ago. The company had an electrician replace all that with a new conduit system attached to the cubicle walls.