We are from Alberta, and I own an electrical company.
I have been asked by a BC Mechanical P. Eng. to install an emergency STOP button at the man-door to the boiler room. It's intent is to 'halt' the operation of the boilers in the room should there be an emergency. He is demanding that I do this by de-energizing the main primary power feeding the power! Dumping the incoming power kills all the VFD's, and PLC's, and the CPU to the boiler! Why not control the boiler's control circuit??? I find this odd and illogical.
1) Understandably, emergencies happen, however, what emergency is this intended to apply to (gas leak, CO, combustion downdraft, etc...)?
2) Why does the incoming AC power require to be de-energized? Why can't the control circuit that operates (enable, safety stop, etc....) operation of the boiler be interrupted?
3) Is this an AESHRAE code, of a CGA gas code? If so, can I be referred to the code so I can read the article and/or rule/sub-rule?
I am so puzzled by this, I am almost about to contest this with the Mech. P. Eng.
Example: On conveyors, saws, benders, or any automatic machine that can harm someone, we ALWAYS use the control circuit to stop (or halt) the operation of the respective equipment.
Thanks So Much
I have been asked by a BC Mechanical P. Eng. to install an emergency STOP button at the man-door to the boiler room. It's intent is to 'halt' the operation of the boilers in the room should there be an emergency. He is demanding that I do this by de-energizing the main primary power feeding the power! Dumping the incoming power kills all the VFD's, and PLC's, and the CPU to the boiler! Why not control the boiler's control circuit??? I find this odd and illogical.
1) Understandably, emergencies happen, however, what emergency is this intended to apply to (gas leak, CO, combustion downdraft, etc...)?
2) Why does the incoming AC power require to be de-energized? Why can't the control circuit that operates (enable, safety stop, etc....) operation of the boiler be interrupted?
3) Is this an AESHRAE code, of a CGA gas code? If so, can I be referred to the code so I can read the article and/or rule/sub-rule?
I am so puzzled by this, I am almost about to contest this with the Mech. P. Eng.
Example: On conveyors, saws, benders, or any automatic machine that can harm someone, we ALWAYS use the control circuit to stop (or halt) the operation of the respective equipment.
Thanks So Much