Greenfield connected directly to EMT?

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Jon456

Jon456

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Colorado
I need to connect a short length of Greenfield (about 2 or 3 feet) to a run of EMT, and then pull continuous conductors through both sections of conduit (no splices). I'd like to connect the two conduits directly, avoiding a junction box or conduit body. I discovered there is a connector that consists of a compression fitting at one end (for the EMT) and a screw-in connector at the other end (for the flex). Seems like just what I'm looking for! But is what I'm proposing code acceptable?

Deductive reasoning says "Yes" (otherwise, why would such a connector exist?). But I'd like to have more than just my common sense to fall back on. Besides, I don't know if there are any restrictions or special circumstances I need to be aware of for this type of direct join.
 
Thanks for the quick replies!

As for the transformer, I haven't done any transformer hook ups (yet), so I'm not sure why they are different than, say, motors or other devices. (I wouldn't mind learning if anyone cares to explain!)

Anyway, until I found that "changeover" connector, I thought I would have to mount a junction box between the EMT and the Greenfield. Glad to hear that's not the case.
 
Jon456 said:
As for the transformer, I haven't done any transformer hook ups (yet), so I'm not sure why they are different than, say, motors or other devices. (I wouldn't mind learning if anyone cares to explain!)
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Transformers vibrate while in operation, and are typically installed with a short piece of flex connecting the tranformer to the inflexible raceway.
 
This method is also used on industial equipment/machinery's main/sub control panels. From a solid piping to a short liquid/seal tight flex connection.
 
codeunderstanding said:
When you change over like that can the flex still be used as the ECG or would you have to run a seperate ECG conductor?
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maybe, if your installation meets the requirements in 250.118(5).
 
George Stolz said:
Transformers vibrate while in operation, and are typically installed with a short piece of flex connecting the tranformer to the inflexible raceway.
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I noticed over the years that people go through great pains to connect transformer enclosures with flexible connections. I dont see why unless it is in the project specifications or hanging on threaded rod.
The enclosures are usually bolted to the floor and the transformer inside is normally on isolation pads or something similar.
 
jrannis said:
I noticed over the years that people go through great pains to connect transformer enclosures with flexible connections. I dont see why unless it is in the project specifications or hanging on threaded rod.
The enclosures are usually bolted to the floor and the transformer inside is normally on isolation pads or something similar.
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Thats true. It is a misconception that transformer vibrate enough that a flex connection is required. There are many transformers installed today with a "hard" connection, such as raceways or even trough.
 
MF Dagger said:
I always just call em gofroms. Like go from emt to flex. The ones I've used have always been set screw on both ends though
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We called them fromtos, because you went from one raceway to another.:smile:
 
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