Talk:Bushing (electrical)

Content that may need to be merged

A page was created with the title Anti-Short Bushing. As it is identical in concept to the topic of this page, I redirected here. The following is the content from the page. It needs clean up but it could be used as a basis for a history section. --Daniel J. Leivick (talk) 09:05, 12 December 2007 (UTC)

In the late 1940's there were many fires that were attributed to electrical sources, particularly to the use of armored cable. Harry Freeman, the Manager of the Wire and Cable Division at CSA was given the task to investigate the problem. Bert Barraclough, Vice-President of Manufacturing, Triangle Conduit and Cable Canada was brought into the investigation and for some two years the two responded to every fire call in Toronto.

The findings of the investigation were that the conductor insulation in the armored cable was being cut by the very sharp edges of the cut armor when terminations were being made.

The two investigators found that the insertion of a hard, waxed fiber bushing between the armor and the insulated conductors would prevent damage to the insulation and the anti-short bushing was born. There were many attempts to make the bushing of other materials since the bushing that was put into use was quite expensive and no suitable alternative product was found until 1960. The idea of producing a molded plastic bushing that was stronger and could be designed for efficient insertion into the cable, came about.

This was the origin of the anti-short plastic bushing that became the standard for the industry. There have been many refinements to the bushing and many attempts to copy the product but the plastic anti-short bushing has continued to be the industry standard to this day due to the continued quality assurance and technology improvements by the manufacturer working with the UL & CSA. There are now 19 different sizes available and they are manufactured in 90°C, 105°C, and 150°C material. They can be supplied with or without 3 indicator* tabs for easy identification by the electrical inspectors and to comply with CSA and UL requirements.

External References

[1] NEMA Engineering Department Bulletin No. 90, titled Use of Anti-Short Bushings for Terminating Type MC Cable [2] Patent on the anti-short bushing [3] The National Electric Manufacturers Association (NEMA)

(Link fixed). It's a bit hard to see the notability and importance of this material: it's extremely narrow in its scope. It's not the history of the electrical bushing itself, but of an investigation into a type fault of a particular design. I'm a transmission engineer myself, and I have never heard of this bushing, nor its type fault, nor of the individuals named. It's not mentioned in any of the three HV transmission textbooks I have to hand. — BillC ^talk 18:03, 12 December 2007 (UTC)

Sure, I don't know anything about this topic. If the material is not needed then we can forget about it. Thanks for your help. --Daniel J. Leivick (talk) 18:59, 12 December 2007 (UTC)

Merge into Insulator (electrical)?

There is a lot that bushings have in common with other high voltage insulators; materials, dielectric strength, creep length, flashover, puncture voltage, sheds, breakdown mechanisms, grading, etc. These are all covered in Insulator (electrical). Although this article has a lot of unique material, I think it could be more useful for the reader by being integrated into Insulator. Comments? --Chetvorno^TALK 09:50, 28 October 2008 (UTC)

Photo

Can we add a photo at the top right of the article of a typical bushing? (We have some pictures at the bottom and I'd move one to the top but I'm not sure any of them are the 'typical' bushing.) RJFJR (talk) 14:37, 21 November 2012 (UTC)

Article needs rewriting

This is a terribly written article. A bushing allows the safe passage of electrical energy through an "earth field"? I think it should be "earthed barrier". "Voltage...can be attracted toward the earthed material..."? I think he means "charge" or "leakage currents". If the "energy of the leakage path" overcomes the dielectric it may puncture the insulation? It must be capable of enduring "high voltage moments"? Even without these bad word choices, the explanation is so pompously written that nontechnical readers are not going to get much of an idea of what a bushing is. --Chetvorno^TALK 21:02, 24 November 2012 (UTC)

Meaning of "bushing"

Can the subject of this article be referred to as "bush"? Please comment at Talk:Bush#Bushing. – Uanfala (talk) 22:02, 21 June 2021 (UTC)

Bushing is not an insulator but rather an electrical assembly made of several component one of which is the insulator (either porcelain or silicone rubber). Bushing is almost always misconstrued as insulator because the insulator is the biggest and most visible component of the whole assembly. 112.198.162.140 (talk) 10:53, 17 March 2022 (UTC)