topic Re: Conduit OD Not Modeled Correctly in Revit MEP Forum

Conduit OD Not Modeled Correctly

djforemandesign — Fri, 09 Apr 2021 14:16:40 GMT

The OD for conduit is defined in the electrical settings. I would think that these measurements are what are used when the conduit is actually modeled.

But looking at the OOTB EMT the dimensions for the OD don't match what the modeled OD is.

See the screenshot below for a visual of the differences:

For the sizes 1/2" to 2" the actual model is off by a small amount.

Interesting though looking at the 3/4" conduit the OD provided by Wheatland is 0.922" which is closer to what is modeled than what is in the electrical settings.

My question: Is there anyway that this can be accurate?

Re: Conduit OD Not Modeled Correctly

timlove — Fri, 09 Apr 2021 14:20:32 GMT

Revit reports conduit OD in the electrical settings rounded to the 1/32". The actual dimensions are entered to the 1/256"

Re: Conduit OD Not Modeled Correctly

djforemandesign — Fri, 09 Apr 2021 14:31:28 GMT

Out of curiosity. Is the actual dimension being used accessible somewhere?

In a file or through the api?

Or is it hard coded to a certain dimension?

Autodesk should really update the electrical settings to be able to enter dimensions to 1/256" accuracy.

Re: Conduit OD Not Modeled Correctly

fabiosato — Mon, 12 Apr 2021 22:56:35 GMT

Hello,

To have a proper control of the size, delete the existing one and recreate with the desired rounding.

Re: Conduit OD Not Modeled Correctly

Mahmoud.Ziedan — Mon, 12 Apr 2021 23:47:26 GMT

@djforemandesign

I believe this is a good question to figure out the discrepancy ...But I also believe that this difference won't result in a big problem in the coordination or the drawings. Also the tagged information will be the conduit size and not the OD. No offense to your question 🙂

Re: Conduit OD Not Modeled Correctly

djforemandesign — Tue, 13 Apr 2021 00:15:03 GMT

@fabiosato

The issue is in electrical settings the rounding doesn't allow the precision of 1/256" like the rest of Revit. It only goes to 1/32".

@Mahmoud.Ziedan

I understand that the difference is very minimal and it won't really affect the drawings or coordination.

Though depending on the number of conduit it could affect prefabrication of the racks if you are trying to avoid something through coordination, but that's probably not too common.

The real reason I was trying to figure this out was because I'm working on creating conduit using Dynamo. Currently I'm creating the conduit based on the center line, but I would like to create it based on the top or bottom elevation as well.

So I was trying to figure out a way to get the actual OD of the conduit so I could plug that into a formula for the creation of the conduit. Using the electrical settings the conduit would be created just short of the desired elevation.

Just wanted to see if anyone knew of a way to get the OD Revit is actually using to create the conduit.

Since the value is close I might look into possibly rounding the formula up/down to get the desired results.

Re: Conduit OD Not Modeled Correctly

Mahmoud.Ziedan — Tue, 13 Apr 2021 00:24:47 GMT

@djforemandesign

Okay I got your point, yes I think rounding will solve this issue otherwise you shall use the physical dimension of the conduit in dynamo and not relying on the OD parameter and I think this gonna be very complicated so the best solution is rounding.

Re: Conduit OD Not Modeled Correctly

djforemandesign — Tue, 13 Apr 2021 00:32:44 GMT

@Mahmoud.Ziedan

Yeah I have it working for the center line, but realized that the bottom elevation is not an even height so wanted to try to figure out how to get the bottom/top at the elevation I want instead of the center.

The only problem is the way I'm going about it right now is I'm creating lines in Dynamo to represent the conduit then once I have all the lines created I use them to create the conduit. So the line has to be at the correct elevation and I won't have the physical conduit until after the lines are made.

I know that after the conduit is made I could use Dynamo to change the elevation of the conduit, but that is just going back through what I already did.

Maybe that's what I'll have to do if the rounding doesn't work. I'll figure it out....eventually. Just was hoping for an easy solution.

I appreciate your help though. Wish Autodesk didn't force the rounding in the electrical settings for some reason.

Re: Conduit OD Not Modeled Correctly

timlove — Tue, 13 Apr 2021 01:17:16 GMT

The conduit setting only report rounded to the 1/32". You can still enter in to at least the 1/256", maybe even to the 1/512" I'm not certain if it goes more accurate or not. The conduit is modeled in to at least the 1/256" accuracy.
as for the issue of dynamo, I am not sure if you can set the vertical justification of the conduit using it or if you would have to set that first in your conduit placement tools. Once you start the conduit tool the ribbon has the justification button that you can use to set the vertical and horizontal justifications.

I know with Revit 2019 Dynamo you can get the bottom elevation of conduit, and change the values once it is placed.

Re: Conduit OD Not Modeled Correctly

djforemandesign — Tue, 13 Apr 2021 12:32:21 GMT

So OOTB at least for Revit 2020 (I assume for all years) the electrical settings for a 3/4" EMT is the OD is set to 15/16".

When modeled this is actually modeled at 59/64". This is closer to the actual size of the conduit.

If you go in and edit this OD to something else no surprise Revit rounds to 1/32", but when you actually model the conduit the OD matches what it rounds to.

So you can't get the conduit OD back to 59/64" once you edit the OOTB settings.

Again not sure why Autodesk is rounding these settings when the rest of Revit is 1/256" accuracy.

For the conduit creation you can edit the elevation once the conduit is created, but I was trying to do it when the conduit was created.

I'll have to look into the options with conduit creation to see if there is an option to set elevation.