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The sliding bolt, when extended, mechanically prevents operation of a switch, valve, gate, or other device. Many variations exist, with different shapes of interlock bolt and multiple lock cylinders on an interlock. A significant feature of the interlock is that the key is held or trapped in one position of the lock.
Trapped key interlock switchgear door. An interlock is a feature that makes the state of two mechanisms or functions mutually dependent. It may consist of any electrical or mechanical devices, or systems. In most applications, an interlock is used to help prevent any damage to the machine or to the operator handling the machine.
An SIS performs a safety instrumented function (SIF). The SIS is credited with a certain measure of reliability depending on its safety integrity level (SIL). The required SIL is determined from a quantitative process hazard analysis (PHA), such as a Layers of Protection Analysis (LOPA). The SIL requirements are verified during the design ...
The organization was founded in 1933 as the Industrial Safety Equipment Association. It adopted its current name in 2000. [ 1 ] Since 2002 it has had a Web site accessible to the public and member organizations. [ 2 ]
Motorized gates – In case of power outage the gate can be pushed open by hand with no crank or key required. However, as this would allow virtually anyone to go through the gate, a fail-secure design is used: In a power outage, the gate can only be opened by a hand crank that is usually kept in a safe area or under lock and key. When such a ...
Global Industrial was established in 1949 by Michael and Paul Leeds in Queens, New York as a material handling equipment supplier. [4] In 1985 the company began to deal with computer products. Through acquisitions of other computer-supply companies, the company expanded across the U.S. and into parts of Europe, with a revenue of nearly $180 ...
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