Industrial Control Panel Main Disconnects
Industrial Control Panel Main Disconnects
(OP)
Industrial Disconnects
The JIC (Joint Industrial Council) used to have a standard stating that the door on a disconnect had to be latched, if door was in closed position, before turning on disconnect. Where can I find information on when and why this is no longer a requirement? In most panels this meant a 3 point latch, but it depended on size of door to panel.
The JIC (Joint Industrial Council) used to have a standard stating that the door on a disconnect had to be latched, if door was in closed position, before turning on disconnect. Where can I find information on when and why this is no longer a requirement? In most panels this meant a 3 point latch, but it depended on size of door to panel.






RE: Industrial Control Panel Main Disconnects
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David Baird
mrbaird@hotmail.com
Sr Controls Designer
EET degree.
Journeyman Electrician.
RE: Industrial Control Panel Main Disconnects
RE: Industrial Control Panel Main Disconnects
Check out thread242-1929
Having said that, I too could not find his particular issue mentioned. It may be one that slipped through the cracks, maybe intentionally, because I know for a fact that it caused may European manufacturers nothing but headaches since they had no equivalent standards and did not have products that would work.
What the JIC required was bi-directional interlocking: you could not open the door without turning off the disconnect, but also you could not turn on the disconnect without latching the door first.. IEC safety disconnect products are based on the combined function, where as soon as you energize the disconnect, the disconnect mechanism interlocks with the door so that you cannot open it. The subtle difference is that the door is not necessarily "latched" in that you can have the door partially ajar even with the disconnect On. That would not have satisfied the old JIC standard.
I don't know what went on in the back rooms, but I suspect that under pressure from international manufacturers (who now own most of the old NEMA manufacturers), that subtle difference was allowed to quietly drop off the radar.
"Our virtues and our failings are inseparable, like force and matter. When they separate, man is no more." Nikola Tesla
Member, P3
jraef (Electrical)
Just FYI, that old JIC standard was EGP-1-1967, for what it's worth.
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RE: Industrial Control Panel Main Disconnects
This guy said he had a copy of them back in 2003,but who knows if he still does. Might be worth asking.
http://www.control.com/1026164855/index_html