To me the most non-compliant circuit I have ever seen, what do you think?
The project is an upgrade of the control system for some industrial existing equipment, basically the existing 1995 control panels were copied and the PLC system dated to a
Control Logix platform. It is my understanding that the system is for equipment safety, all of the CR's pertain to safety, this is a pressure vessel application.
Example "B" (new control panels contain this circuit)
I opposed this circuit for changes for several reasons
1st - a safety system must be done with Safety rated components relay, module, etc. (may have been OK in the 90's but not today)
2nd - the colors are wrong white can not be used as shown, would confuse electricians when troubleshooting
3rd - circuit does not comply with UL508A 45.
4th - I would have to check NFPA70 there has to be something in there, to prevent this.
I proposed at least a color code change of Example A
I was overruled and told these were "Safety Buss" circuits, we have always done it this way!
To me the most non-compliant circuit I have ever seen, what do you think?
The project is an upgrade of the control system for some industrial existing equipment, basically the existing 1995 control panels were copied and the PLC system dated to a
Control Logix platform. It is my understanding that the system is for equipment safety, all of the CR's pertain to safety, this is a pressure vessel application.
Example "B" (new control panels contain this circuit)
I opposed this circuit for changes for several reasons
1st - a safety system must be done with Safety rated components relay, module, etc. (may have been OK in the 90's but not today)
2nd - the colors are wrong white can not be used as shown, would confuse electricians when troubleshooting
3rd - circuit does not comply with UL508A 45.
4th - I would have to check NFPA70 there has to be something in there, to prevent this.
I proposed at least a color code change of Example A
I was overruled and told these were "Safety Buss" circuits, we have always done it this way!
To me the most non-compliant circuit I have ever seen, what do you think?