royta,
Stackers are for allowing multiple cables to be stacked, so they take up less space.
search "3m stackers"
The two residential EC's I worked for just stacked up to two 14-2 or 12-2, or combination of both, and used a regular staple. I don't recall if they did the same with 14-3. Perhaps a 14-2 and a 14-3 together. Definitely not more than a single 12-3 though. Was I taught an incorrect way? The 3M website mentions, "putting an end to...the potential heating that could occur when cables are held together tightly under a single fastener." I see the value of using one, but there is no code violation if you don't use one, is there?
[This message has been edited by royta (edited 09-11-2004).]
