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#173705 - 01/16/08 02:20 PM Botl in or stab in?
rj Offline

Registered: 01/23/03
Posts: 23
Loc: Skidmore, Missouri, USA
I am in need of some information about bolt in breakers compared to stabe ins. I know that you are suppost to have a better connection with a bolt in, but what about maintenace in the long run. Myself I would rahter work and maintain the stabe in. Any others with that feeling or that bolt in is the best way to go?
Thanks for any input on this.

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#173706 - 01/16/08 02:27 PM Re: Botl in or stab in? [Re: rj]
wire_twister Offline

Registered: 07/25/07
Posts: 265
Loc: Georgia USA
I like the bolt in for areas with high load or vibration. I worked in manufacturing plants for about 16 years, most of the equipment was either Westinghouse or Square D bolt in type, all of it gave vary little trouble. As far as maint. goes we would shut down the panels once every other year and check the screws for tightness, I do not remember ever tightning one more than about 1/16 of a turn, of course all this was wired with copper wire, as it should be in an industrial setting.

Life is tough, Life is tougher when you are stupid

#173708 - 01/16/08 05:58 PM Re: Botl in or stab in? [Re: wire_twister]
leland Offline

Registered: 08/20/07
Posts: 856
Loc: Lowell area, Ma. USA
Industrial: bolt in every time. reliability.

Resi: stab ins are fine, very low demand.

#173725 - 01/17/08 03:59 AM Re: Botl in or stab in? [Re: leland]
SteveFehr Offline

Registered: 03/19/05
Posts: 1192
Loc: Chesapeake, VA
Anywhere with potentially high fault current requires bolt-on, because the electromagnetic forces in a full-blown short-circuit fault can be enough to tear cables right out of set screws, and breakers right off the panel.

If you're just fed from a small transformer (ala residential size) or otherwise have low availible fault current, then it's less of an issue.

#173726 - 01/17/08 06:12 AM Re: Botl in or stab in? [Re: SteveFehr]
electure Offline


Registered: 12/24/00
Posts: 4226
Loc: Fullerton, CA USA
I agree with the rest of the guys that in most cases I prefer a bolted connection.

That said:
The Square D "I-Line" breaker, their premium offering, is a plug in.

The lowly ITE-Bulldog Pushmatic is a bolt on breaker.



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