A
We have a problem with operators using the emergency stop circuits to power down a line rather than doing the "right thing" and going through the sequence of pressing the individual stop PB's (not that it's hard since they're on
the same control desk). Now....
CSA Z432-94, section 7.3 states:
"It is essential that release or resetting of the emergency stopping device does not cause the machine to operate."
Basically this means that any latched control circuits must be broken by the hard-wired e-stop and that the control circuits go through an alternate means to be re-latched.
Ontario Health and Safety Act Reg 851, s.27 states:
"An emergency stop control.... be conspicuously identified..."
Basically this means it has to be visible and obvious.
However, it has been suggested to me that there is also a regulation "somewhere" stating that the e-stop circuit cannot be used as a system general stop. That is, start/stop controls must be separate from the e-stop circuit.
Although this makes good design sense, and would enhance compliance the Reg 851 s.27, I can't find anything that specifically says this must be so!!!!! Help!!!!
Anthony Kerstens P.Eng.
A.G. Simpson Co. Limited
the same control desk). Now....
CSA Z432-94, section 7.3 states:
"It is essential that release or resetting of the emergency stopping device does not cause the machine to operate."
Basically this means that any latched control circuits must be broken by the hard-wired e-stop and that the control circuits go through an alternate means to be re-latched.
Ontario Health and Safety Act Reg 851, s.27 states:
"An emergency stop control.... be conspicuously identified..."
Basically this means it has to be visible and obvious.
However, it has been suggested to me that there is also a regulation "somewhere" stating that the e-stop circuit cannot be used as a system general stop. That is, start/stop controls must be separate from the e-stop circuit.
Although this makes good design sense, and would enhance compliance the Reg 851 s.27, I can't find anything that specifically says this must be so!!!!! Help!!!!
Anthony Kerstens P.Eng.
A.G. Simpson Co. Limited