Bryan,
Darn good point, mate!.
You really have to look behind the reason WHY the said safety systems are being defeated in the first place.
Is it because they are time consuming to operate or don't work correctly, or have they not been installed correctly.
The number of times I've seen an incorrectly installed Limit switch or Proxy switch.
Also, how often are these safety devices tested?.
One question, how prevalent is the Pull-Wire on an Industrial site in the US, where a horizontal wire is stretched from one end of the process to the other, a vertical pull on this wire will shut-down all Electrical and Pneumatics gear?.
