how do you get rid of concentric knockouts

Best way to remove concentric knockouts

• 1. Pry first ring in the direction that it is punched with screwdriver midway between ties, using pliers flat against box under screwdriver (Fig. 2).
• 2. Bend first ring section In the direction that it is punched, with pliers, then back and forth to break ties (Fig.3).
• 3. Remove successive rings in the direction that they are punched by

Full Answer

How do you get rid of a knockout?

0:542:39Removing Knock-Outs from QO™ & Homeline Load Centers - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo the first one find the spot well I go the opposite. I knock it out then you'll take your pliersMoreSo the first one find the spot well I go the opposite. I knock it out then you'll take your pliers on the underside. And you'll twist it out.

What are concentric knockouts?

Concentric or eccentric knockouts • that are part of a cabinet, cutout box, junction box, or pull box, installed on an electrical system that has a voltage over 250 volts have not been investi- gated for grounding and bonding, and would therefore require a bonding jumper to be installed.

How do you remove plastic knockouts?

How to remove electrical knockouts on a plastic enclosure:Place a flat-head screwdriver into the slot of the electrical box knockout that is to be removed. ... Hit or tap the end of the screwdriver to remove the knockout and dislodge the rest of the knockout by hand if needed.

How do you remove knockout from inside box?

0:030:59Electrician Quick Tip #2 - Removing KO From an Existing Box - YouTubeYouTubeStart of suggested clipEnd of suggested clipGuys what you're going to need is an impact driver a right angle attachment a tech screw and a pairMoreGuys what you're going to need is an impact driver a right angle attachment a tech screw and a pair of diagonal cutters.

What are concentric and eccentric knockouts?

Concentric knockouts look like bulls-eyes... one circle indside of another with the inside and outside lines spaced equal distances apart. Each "ring" must be completely removed, all the way around the circle. Eccentric knockouts look like crescent moons, staggered around the outside of a circle.

What does concentric mean in electrical?

concentric cable means a composite cable comprising an inner conductor which is insulated and one or more outer conductors which are insulated from one another and are disposed over the insulation of, and more or less around, the inner conductor; Sample 1Sample 2Sample 3.

How do you use knockout seals?

0:050:45Snap-in Style Knockout Seals... SNAP Series - YouTubeYouTubeStart of suggested clipEnd of suggested clipSimply place the knockout seal. Inside the hole and then you give it a little tap with a screwdriverMoreSimply place the knockout seal. Inside the hole and then you give it a little tap with a screwdriver or a hammer. You.

How would you seal unused knockouts in panels and boxes?

0:291:271/2" Knockout Seal for Electrical Junction Box or Panel KOS-50-VTYouTubeStart of suggested clipEnd of suggested clipYou simply slide the product inside the open knock a hole. And allow the backer bar to catch insideMoreYou simply slide the product inside the open knock a hole. And allow the backer bar to catch inside the box as. You can see the closed cell gasket. Will create an airtight seal.

How do you use the knockout punch kit?

0:021:15Klein Tools Knock-Out Punch Set - YouTubeYouTubeStart of suggested clipEnd of suggested clipWith your die insert that in the hole that you just made on the opposite side of the material takeMoreWith your die insert that in the hole that you just made on the opposite side of the material take your punch. And thread that out threat. Until it's tight on the material.

Are open knockouts on outlet boxes permitted by OSHA?

The knockouts in cabinets, boxes, and fittings should be removed only if conductors are to be run through them. However, if a knockout is missing or if there is another hole in the box, the hole or opening must be closed.

What is a knockout in an electrical panel?

Knockouts are the places where an electrical box has been punched through to allow for wiring, so connections for outlets, light fixtures or additional wiring can be made within the box, which is rated to resist fire if anything overheats.

How do you remove a nut from a junction box?

A locknut should surround the wires where they come into the box. Try to twist the locknuts counterclockwise with your fingers. If you can't loosen the locknut with your fingers, place a flat-head screwdriver against one of the notches on the locknut and push against the screwdriver to turn the nut counterclockwise.

How do you remove an outdoor electrical box?

1:463:09Removing an exterior electrical outlet box - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo I could feel exactly where that nail is I'm just gonna grab this and use it like a little handsawMoreSo I could feel exactly where that nail is I'm just gonna grab this and use it like a little handsaw. Back and forth just little short strokes. I'm going to cut that nail. Off.

What is a knockout box?

Knockout boxes for electrical applications provide the flexibility of onsite setup of cables, wiring, or conduit. Made from durable polycarbonate plastic, the enclosures are molded with metric knockouts that can simply be removed with a screwdriver.

How do you use plastic electrical boxes?

0:314:39How to Choose an Electrical Box | Ask This Old House - YouTubeYouTubeStart of suggested clipEnd of suggested clipExactly and you've got enough room to bang that in and so they go they set themselves a little tabMoreExactly and you've got enough room to bang that in and so they go they set themselves a little tab to set the spacing. And look what you get and that's the finish. And they're usually always plastic.

Are open knockouts on outlet boxes permitted by OSHA?

The knockouts in cabinets, boxes, and fittings should be removed only if conductors are to be run through them. However, if a knockout is missing or if there is another hole in the box, the hole or opening must be closed.

What size bushings do I need for Cutler Hammer 200 amp disconnects?

Me too, brother. Some brands are worse than others. The Cutler Hammer outdoor 200 amp disconnects have up to a 2-1/2" knockout, and I only need the 2" knockout most of the time. That last concentric ring is only a little sliver, and it seems to want to come out anyhow. I always have a 2-1/2 x 2" reducing bushing handy for these, just in case. I prefer to use reducing bushings with a locknut on each side rather than a pair of reducing washers. Just seems so much sturdier, even if a couple bucks more in cost.

Can you remove a KO with a chisel?

KO's come in two categories: Those that can be removed with just fingers, and those that won't come out without a cold chisel and 3 lb hammer. There doesn't appear to be middle ground.

Do you need to use the snip method to punch out a die?

Some are not punched out enough and you need to use the snip method. Depends on when they last put a new die in the punch.

What is a concentric knockout?

A concentric ring knockout is defined by a concentric score or weakened line which extends in two almost semi-circular but unjoined arcs around the disc, adjacent ends of each concentric are being connected to the inner circle where the latter terminates at the nonweakened connecting portion. Thus the ring knockout does not interfere with a connecting bridge now defined between the box side and the disc and is itself connected to the box side at a non-weakenecl point diametrically opposed from the disc connecting bridge. By selectively removing either the disc alone or the disc and concentric ring it is possible to obtain an aperture having either of two predetermined diameters which, by appropriate selection of sizes, will accommodate most commercial wire sizes.

How to remove a ring knockout?

These knockouts are customarily removed by a complicated procedure which requires placing a screwdriver or similar blunt instrument on the disc knockout and striking it with a hammer until the disc is sufficiently fractured from the box side and from the ring knockout to permit the disc to be manually bent back and forth until it is completely fractured. The tip of the screwdriver is then placed under the ring knockout at a point 90 from the point of non-weakened connection between the ring and the box side and, by using the opposite side of the ring knockout as a fulcrum, the screwdriver is forced downwardly so that the first mentioned side of the ring is broken from the box side and bent upwardly as much as ,possiblleThis procedure is repeated with the screwdriver tip under the opposite side of the ring, using the opposite side of the aperture as a fulcrum. A pliers is now used to press the two up wardly bent halves ofthe ring knockout together and to bend them back and forth until the points of nonweakened connection is broken to permit complete removal of the ring. This procedure is awkward, time consuming and requires the use of several tools.

Why is the prior tool opposed gripping?

In addition, by virtue of the fact that the prior tool has opposed gripping means which simultaneously engage opposite portions of the ring knockout in order to effect the oscillatory fracturing movement of the ring knockout, the tool was particularly designed for use with a predetermined size of ring knockout and therefore was not practically or efficiently suitable for use with ring knockouts of other than the predetermined size.

What is knockout operation?

SUMMARY OF THE INVENTION knockout operation that the tool be of any particularly design which requires special shaping of parts other than those which can be performed by a simple punching operation and further that it is not necessary that both opposite portions be simultaneously gripped during the fracturing operation, thereby eliminating the necessity for relatively movable parts as required in the prior tool and facilitating the use of a single tool for removing knockouts of several different sizes. It has been discovered that a tool having stationary oppositely disposed gripping means can be utilized to remove ring knockouts of several different sizes by continuing a backward and forward motion of the tool with the oscillatory movement of the prior tool in a manner fully described hereinbelow.

How to eliminate tension on wires?

In order to eliminate any tension or pull on the terminal connections of wire within the box, the wires are secured to the side of the box where they pass through an aperture. This is usually accomplished by providing a socket which is secured within the aperture in the side of the box, the socket itself having screws or other suitable means for tightly gripping the outer covering or sheathof the wires.

What is a H05K13/0007?

H05K13/0007—Apparatus or processes specially adapted for manufacturing or adjusting assemblages of electric components using handtools

What is a H05K?

H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

Why bond jumper for concentric knockouts?

If the integrity of the concentric or eccentric knockouts has been compromised during installation , a bonding jumper should be provided to ensure compliance with all of the requirements of the NEC.

What voltage is a knockout?

Concentric or eccentric knockouts that are part of a cabinet, cutout box, junction box, or pull box, installed on an electrical system that has a voltage over 250 volt s have not been investigated for grounding and bonding, and would therefore require a bonding jumper to be installed.

Is arcing and burning during a current test acceptable?

As a result of the application of the current, the outer knockout is required to remain in place, and continuity is required to be maintained between the box and the conduit. Arcing and burning during the test are common and are acceptable.

Can a concentric knockout be used without a jumper?

For bonding circuits over 250 volts, NEC Section 250.97 is applicable, and by exception, allows concentric and eccentric knockouts to be used without bonding jumpers, provided the box or enclosure with concentric or eccentric knockouts is listed to provide a reliable bonding connection. For the UL product category for Metallic Outlet Boxes (QCIT), the UL Guide Information indicates “All boxes with concentric or eccentric knockouts have been investigated for bonding and are suitable for bonding without any additional bonding means around concentric (or eccentric) knockouts where used in circuits above or below 250 V, and may be marked as such.” Please refer to UL Product iQ TM and enter “ QCIT ” into the search box.

Overview

Bonding at Services

Bonding For Over 250 Volts

• For bonding circuits over 250 volts, NEC Section 250.97 is applicable, and by exception, allows concentric and eccentric knockouts to be used without bonding jumpers, provided the box or enclosure with concentric or eccentric knockouts is listed to provide a reliable bonding connection. For the UL product category for Metallic Outlet Boxes (QCIT), ...

See more on code-authorities.ul.com

Electrical Testing of Metallic Outlet Boxes

Other Types of Metallic Enclosures

Additional Code Considerations