knocking out knockouts

[Mr. Wizard]

Anyone have a good trick or technique on how to easily knockout concentric or eccentric KO's without taking more rings out than you want? I usually will bend one of the outer rings and have to bend it back, but is there an easier way?

 

[480sparky]

Take out the smallest one, and use a KO set to surgically remove the set you want.

 

[ActionDave]

I use my 3/8 unibit. Drill the solid KO with near the tab that holds it in place. Stop when the bit scrapes off the tab, twist with your favorite pliers.

 

[Kdog76]

Take your time & look at the configuration of knockout openings. Usually the tool & die setup from the factory are not set that deep to make it that easy. I know meter sockets esp. are hard to do.
I've found a screwdriver & lineman's combo still work the best. Some need to be knocked out from the inside of the enclosure instead of the outside. The center opening is usually the easiest to pry off & you can work out from there, prying a little w/ a screwdriver one side at a time.
After you get to the outermost ring that you need & open it up a little, you can see the tabs on each side that are holding it in place to the next size up. Lineman's plies & screwdriver with work piece on a stable position, you can knock the remaining steel holding the ring in place. A few good thumps (watch your fingers) on each one & should give way.
PITA, you bet, but be smart & be safe.

 

[yired29]

I like to drill out the small weld spots for the concentric I would like removed. Use a 1/8 inch drill bit. When done correctly a soft whack will knock it out without disturbing the remaining ko's. I'm sure the previous methods work just as good.

 

[Buck Parrish]

I carry reducing washers. From 2.5" to .5"

 

[B4T]

I take a sharp pair of dikes and cut the ring into sections and bend it in and out

 

[chris kennedy]

I like to drill out the small weld spots for the concentric I would like removed. Use a 1/8 inch drill bit. When done correctly a soft whack will knock it out without disturbing the remaining ko's.

My preferred method also.

 

[ceb58]

I like to drill out the small weld spots for the concentric I would like removed. Use a 1/8 inch drill bit. When done correctly a soft whack will knock it out without disturbing the remaining ko's. I'm sure the previous methods work just as good.

I have done that with a metal cutting bit for my cordless roto zip. Cut the weld spots and pop it out.

 

[Pierre C Belarge]

I carry reducing washers. From 2.5" to .5"

When you use the reducing washers with panels/enclosures that are painted, do you remove the paint from the area the washers are placed?
or
do you bond around the Reducing washers?


I know you are not using reducing washers with PVC, as they are not permitted to be used with PVC.

 

[jeremysterling]

Step One:

Take your time & look at the configuration of knockout openings... I've found a screwdriver & lineman's combo still work the best...

Step Two:

I take a sharp pair of dikes and cut the ring into sections and bend it in and out

Step Three:

I carry reducing washers. From 2.5" to .5"

 

[LarryFine]

I know you are not using reducing washers with PVC, as they are not permitted to be used with PVC.

I did not know that. Reference, please?

 

[LarryFine]

Step One:

Step Two:

Step Three:

Isn't that plagiarism?

 

[Pierre C Belarge]

I did not know that. Reference, please?

Larry, it is up to you to find the reference, what do you think I am....
















UL White Book
Outlet Bushings And Fittings (QCRV)

Go to Grounding
The first paragraph is where you will find the reference I was alluding to.

 

[jxofaltrds]

I did not know that. Reference, please?

If we had every spec for every piece and part I doubt if anything could be built.

I understand specs for safety.

But this is starting to sound like a military inspection. I could fail you all day long on something.

 

[jeremysterling]

Isn't that plagiarism?

Originally Posted by Kdog76


Originally Posted by BLACK4TRUCK


Originally Posted by Buck Parrish


I thought I included citations. These are regarded as well informed sources.

So you are close: it's not plagarism...It is laziness

 

[yired29]

UL White Book
Outlet Bushings And Fittings (QCRV)

Go to Grounding
The first paragraph is where you will find the reference I was alluding to

In the requirements paragraph it states:
The basic standards used to investigate products min this category are............ "Schedule 40 and 80 Rigid PVC Conduit and fittings."

But in the grounding paragraph it states:
"Reducing washers are intended for use with metal enclosures."

So IMO you could use reducing washers on a PVC raceway as long as it was in a metal enclosure??

Correct me if I'm wrong..

 

[infinity]

I take a sharp pair of dikes and cut the ring into sections and bend it in and out

My preferred method also.

Same here. Surgical precision with a good pair of dykes works every time.

 

[jxofaltrds]

In the requirements paragraph it states:

But in the grounding paragraph it states:
"Reducing washers are intended for use with metal enclosures."

QUOTE]

Are they 'rated' for bonding/grounding? I mean when used with metal conduit will they make a continuous path for faults?

 

[infinity]

Are they 'rated' for bonding/grounding? I mean when used with metal conduit will they make a continuous path for faults?

Yes they're listed for bonding metal raceways and enclosures.