Concentric and Eccentric Knockouts: Which Need Grounding Bushings?

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[@Calico5string1962]

Excellent info! Thanks.

[@SparkyChannel]

Welcome!

[@Calico5string1962]

@@SparkyChannel Been in the biz for a little over 40 years, primarily industrial & commercial, with lots of system control/PLC work and big motor-control centers. Retired in '20, but still doing lots & LOTS of side work! Seems it's hard to find "good" electricians these days... none like to do good, clean, quality work anymore - they just slap it together and hope for the best.🫤

[@frankdagreat598]

GOOD EXPLANATION!! Good morning from Sylmar CA

[@SparkyChannel]

Thanks Frank!

[@kenbrown2808]

correct answer: yes. a detail I presume is still valid: if the grounding electrode conductor is routed through metallic conduit, it should be bonded to each end of the conduit, because on a high energy fault, the EMF from the fault can interact with the conduit and cause damage to the grounding electrode conductor, if it is not bonded at both ends. where I am, that disconnect and panel would be connected with schedule 40 or 80 PVC, so no bonding bushings needed.

[@SparkyChannel]

Yes, that is true. And yes, I'll be using PVC for the GEC. Much easier and less expensive.

[@BBQPitmaster626]

Thanks 😊 Sparky! You’re awesome!

[@SparkyChannel]

No problem, good question!

[@Eddy63]

Nice explanation as always ... Thx

[@SparkyChannel]

Thanks Eddy!

[@garydudgeon]

Another good explanation Sparky.

[@SparkyChannel]

Thanks Gary!

[@CarlosTorres-je3bt]

Mr. Sparky can you help me? I need to know where can i buy that hand book with exhibit that you’re using in this video

[@SparkyChannel]

www.nfpa.org/codes-and-standards/nfpa-70-standard-development/70?l=97

[@nevrbdwnruby7484]

Hey bill, can you make a video on bending COMPOUND 90's... THink it would be a great video..

[@icevariable9600]

What’s a compound 90?

[@nevrbdwnruby7484]

@@icevariable9600 2x 45 degrees, example run goes from wall to ceiling... there are times it does need it when obstruction is in the way... I already know how to do it already..

[@TheBoyBd1]

So to be clear. From the ground bushing lug...does it go straight to the panel or ground the disconnect first then the panel ?

[@icevariable9600]

Did you find the answer to this question?

[@effthegop]

Concentric if voltage to ground is over 250 volts to ground. What do I win :).

[@bryankrall8302]

BILL!

[@SparkyChannel]

Hi Brian!

[@wim0104]

and it's not just about the knockouts, isn't it? any raceway with #4 or up...

[@alexmurphy8576]

Nobody around me follows that 😂😂😂

[@stevenpersinger6577]

I wish they would get rid of knockouts in majority of equipment. I'd rather drill my own all day long

[@icevariable9600]

What’s the difference in performance when drilling your own vs using a knockout?

[@stevenpersinger6577]

@icevariable9600 I perform better and faster and more efficient and I don't have to worry about bond bushings in eccentric or concentric

[@icevariable9600]

@@stevenpersinger6577 you still don’t need a binding bushing for holes you cut out?