Killark Push Buttons
Killark push buttons are manufactured to be used in environments that are filled with industrial hazards. Electrical systems that use these push buttons are in control of things that can cause sparks and fires. With push buttons made by Killark, you can be pretty certain that whatever you need to have controlled will be under control. The push buttons are made from materials that will last through the years.
Killark places a strong emphasis on ease of use and safety when designing their push buttons. The design features clear labeling and ergonomic actuators that can be touched or felt so the user knows that the actuation is completed. Push buttons are among the oldest and simplest of operator control interfaces. The human-machine interface (HMI) is the point at which the operator interacts with the machine tool. Push buttons are the simplest and most reliable way for an operator to deliver a command to a machine.
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Maintaining NEMA 4 Rating When Making Enclosure Penetrations
Cutouts are very common when modifying enclosures for push buttons, indication lights, conduit entries or mounting hardware. Cutting into an enclosure runs the risk of eliminating the protective nature of the NEMA rated attributes. Proper steps must be followed in order to preserve the NEMA rating of an enclosure.
Devices mounted to the enclosure must have the same NEMA rating as the enclosure.
This means that if the devices are installed to the manufacturer's specifications, they will be able to maintain the NEMA rating of the enclosure.
Water tight conduit hubs must be used when running wire through a cutout in an enclosure.
There are many different types of conduit hubs that are used to secure conduit to an enclosure. However, only certain conduit hubs are rated for a watertight seal. By using water tight hubs, the NEMA rating of the enclosure is maintained.
Bonded washers are necessary when mounting hardware to an enclosure.
If standard mounting hardware is used, the NEMA rating of the enclosure will no longer be maintained. Bonded washers have rubber gaskets that make a watertight seal around the drilled hole. It is also important to make sure the material used for the bonded washer matches the material of the enclosure. Stainless steel enclosures require stainless steel bonded washers.