The horizontal distance between the 6-32 screw holes for mounting the device is a standard.
No matter who makes the ganged or gang able box the same measurement has to be met.
If they did not follow the standard the device plates would not fit on.
Some speed controls and some dimmers really do not do well and may be required to be derated when ganged in one box.
If you have to break off the removable heat sinks on the sides to fit them in a ganged box you must not use them at the full value.
Bob
[This message has been edited by iwire (edited 05-28-2004).]
