Um..no.
That's just asking for trouble.
If used properly it is not a problem. We have used this method in New Zealand for decades without problems. Not having them would cause more problems such as having to run two leads for the same
circuit. When you have a decent
patch panel and you want two lights, 1 SR and 1 SL, on the same
circuit the piggy backs are really handy. It means you don't have to run a short extension lead along bar which just gets in the way. Also people tend to stretch further putting leads on to the bar if they are working from a ladder.
I work in an amatuer
venue that has quite a good patch
system and only run extensions when I run out of patch leads to use on a bar. It also makes it easier to fault find. If you only have one lead to two lights and they go out you are not sure which one caused the problem if a
fuse has blown. Separate leads are great you just test them individually before even having to get the ladder out. It all saves time.
I prefer a good piggy back
plug to your two-fers because the two-fers look cheap and nasty. Do your
dimmer packs have room for you to put a
two-fer straight into a
dimmer chanell or do you have to use one lead then put the
two-fer up on the lighting bar?
But like anything a piggy back
plug can be abused by overloading.
See the old Donald
Duck cartoon on
safety in the home about this.
In the
theatre fusing is not normaly a problem because every
dimmer channel has it's own
fuse. It only might become a problem if you have unsafe lights and someone hangs on to both at the same time and there are faults on the earth wiring.
Here in NZ the lights and patch leads extension leads are meant to be checked by an electrician each year.
Later
Cutlunch