BUSHINGS

[Alejandro]

Code used to required bushings on any conduit an 1 1/4" and larger, however the code has changed requiring any conduit containing a #_____________ wire or larger to have a bushing. Insert correct wire size:

 

[infinity]

Not sure where the 1.25" raceway comes from but take a look at 300.4(G).

Welcome to the Forum.

 

[augie47]

Back when only the dinosaurs and I worked, the use of a bushing was based on the conduit size. It was changed to wire size.

 

[Dennis Alwon]

I think that is what the question is stating-- the change from conduit to wire size.

 

[Alejandro]

@ infinity

@ infinity

Thanks for the info but i did look at 300.4 (G) and does not help.. that question is just like that in a on line test for a company, but is ok Thanks anyway

 

[infinity]

Back when only the dinosaurs and I worked, the use of a bushing was based on the conduit size. It was changed to wire size.

I've heard that and was taught that in apprentice school but does anyone have a reference from an old code book?

Thanks for the info but i did look at 300.4 (G) and does not help.. that question is just like that in a on line test for a company, but is ok Thanks anyway

Why doesn't 300.4(G) help to answer the question? The wire size is mentioned in that section #4 AWG or larger. :?

300.4(G) Insulated Fittings. Where raceways contain 4 AWG or larger insulated circuit conductors and these conductors enter a cabinet, box, enclosure, or raceway, the conductors shall be protected by a substantial fitting providing a smoothly rounded insulating surface, unless the conductors are separated from the fitting or raceway by substantial insulating material that is securely fastened in place.
Exception: Where threaded hubs or bosses that are an integral part of a cabinet, box, enclosure, or raceway provide a smoothly rounded or flared entry for conductors.
Conduit bushings constructed wholly of insulating material shall not be used to secure a fitting or raceway. The insulating fitting or insulating material shall have a temperature rating not less than the insulation temperature rating of the installed conductors.

 

[jumper]

I've heard that and was taught that in apprentice school but does anyone have a reference from an old code book?




Why doesn't 300.4(G) help to answer the question? The wire size is mentioned in that section #4 AWG or larger. :?

1951 NEC, 318, #4 or larger conductors require bushings. I will look in 1940 later.

 

[infinity]

1951 NEC, 318, #4 or larger conductors require bushings. I will look in 1940 later.

My oldest book, 1987 is based on conductor size like the 2011. Since this requirement has been dead for at least 30 years I wonder why it still comes up on occasion.

 

[tkb]

Why doesn't 300.4(G) help to answer the question? The wire size is mentioned in that section #4 AWG or larger. :?

Because he never looked.
He wants the answers spoon fed to him without doing the work.

 

[Twoskinsoneman]

Not sure where the 1.25" raceway comes from but take a look at 300.4(G).

Welcome to the Forum.

Because he never looked.
He wants the answers spoon fed to him without doing the work.

Infinity all but did! How much effort does it take to turn the page...