red heads, ani-short bushing, size for 3/4" FMC


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Old 05-18-24, 01:40 PM
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red heads, ani-short bushing, size for 3/4" FMC

Can anyone help point be to what size redheads I need for a 3/4" FMC ( I believe 12/3 or maybe 12/4 conductors inside?)
The sizing is so strange. I think redheads that are sized by the conductors. So it will say this will fit a 12/3. But then is gets lost inside the 3/4" FMC. Do I need to size these bushings base on the size of the conductors but also the size of the Flex as well? Thanks for any help
 
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Old 05-18-24, 03:27 PM
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Anti-short bushing are not required for any size of FMC so I think you will have trouble finding them. The only wiring that requires anti-short bushings is AC cable.

Regular bushings that you connect to the connector inside a box are just sized to the trade size of the fitting but are only required for wires #4 or larger.
 
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Old 05-19-24, 02:22 PM
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The anti shorting bushing needs to be sized to fit your flex raceway.
This is to protect your wires from the sharp edges of the cut cable. Although if you are trying to bang through a Job as fast as you can you can skip this and still pass inspection. However, many electricians have encouraged home owners to use these on their small jobs as it take minimal time to use. I do not have vast experience with this, however every electrician I have spoke to has noted, to use them even though they may not use them when doing massive jobs. Many of the electricians doing tutorials online also recommend them to non-professionals like myself.
Not to be confused with a throated connector inside a box.
If you are unfamiliar with redheads, here is a video that helps identify their purpose. However, you will note that there is no specs that identifies what size will fit with a 3/4" Flex metal conduit.
As noted above, anti short bushing seems to be sized by the wire size not the cable size.

Here is a short video to help better understand why you should practice using them.
https://www.youtube.com/watch?v=BiwaHEs4jaI

what they are:
https://www.youtube.com/shorts/lWPaD2pPNF8

Here are bushings that are called 1/2" that fit 12/3
https://www.supplyhouse.com/Arlingto...hing-Box-of-50

Here are bushings labeled 3/4" they fit around 8/4 and much larger awg sizes.
https://www.supplyhouse.com/Arlingto...-Short-Bushing

 

Last edited by dupsta; 05-19-24 at 02:46 PM.
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Old 05-19-24, 03:37 PM
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Tolyn is correct, you don't need redheads. Don't make your project more difficult than it needs to be.
 
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Old 05-19-24, 06:16 PM
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I am very familiar with anti-short bushings have have used thousands of them. Anit-short bushings are only required for AC cables. The manufacturer sometimes provides them with MC cables but the NEC does not require them. Anti-short bushings have never been required for FMC or any other conduit wiring method.
 
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