A knockout punch set, also known as a knockout punch kit or conduit punch set, is a specialized tool used in electrical work and construction to create holes in metal electrical boxes, panels, and enclosures for the installation of conduits, cables, and connectors. It is an essential tool for electricians and other professionals working with electrical systems. 




Here's some information about knockout punch sets and their use in electrical work:

Components of a Knockout Punch Set:

Punches and Dies: The heart of a knockout punch set consists of punches and dies. The punch is the cutting tool that creates the hole, while the die provides support for the material being punched. Punches come in various sizes to match the diameter of the conduit or connector being installed.


Draw Stud: The draw stud is a threaded rod that connects the punch and die. It is used to tighten and secure the punch and die assembly into the knockout hole.


Ratchet or Hydraulic Driver: To apply the necessary force to punch holes through metal, a ratchet or hydraulic driver is used. Manual ratcheting drivers require physical effort to operate, while hydraulic drivers use hydraulic pressure to punch holes with less effort and are faster.


How to Use a Knockout Punch Set:

Marking the Location: First, the electrician marks the location where the hole needs to be created on the metal surface of the electrical box or panel.


Selecting the Appropriate Size: The electrician selects the punch and die of the appropriate size to match the conduit or connector that will pass through the hole.


Aligning the Punch and Die: The punch and die are aligned over the marked spot on the metal surface, ensuring they are centered and secure.


Inserting the Draw Stud: The draw stud is inserted through the die and punch, and it is threaded into the knockout hole from the inside of the electrical box or panel.


Tightening and Punching: The electrician uses a ratchet or hydraulic driver to tighten the draw stud, which forces the punch through the metal, creating a clean and precise hole. The excess metal is removed as a slug.


Removing the Slug: After punching the hole, the draw stud is loosened, and the slug (the piece of metal removed) is removed from the punch and die assembly.


Finishing: The knockout hole is now ready for the installation of conduit, connectors, or cables.


Common Uses in Electrical Work:

Installing electrical conduit through metal enclosures and panels.

Creating holes for cable connectors, cable glands, or cable entry points.

Making openings for switches, receptacles, and other electrical devices in junction boxes.

Preparing enclosures for conduit entries in industrial control panels.

Knockout punch sets are crucial for maintaining the integrity of electrical enclosures and ensuring a neat and professional installation. They offer a cleaner and more precise method of creating holes compared to using drills or other cutting tools. Electricians must use the correct size punch and die set for the job to avoid damaging equipment or compromising electrical safety.