![]() In the lower right corner panel of Subassembly Composer on the Input/Output Parameters tab, create the parameters needed to code the center of the conduits for the purpose of quantifying total length of conduit and connecting the centers of the conduit in each cross-section.Ĩ. Next, we’ll create conduits within the duct bank.ħ. *The green button to the right of the Links field allows you to pick inside of the rectangle of links in the Preview panel thus automatically selecting the links needed. From the Tool Box panel, drag in a Shape and configure the Properties panel as follows: ![]() In the Properties panel, configure the new flowchart contents as follows:Ħ. Drag in a Link which will close the shape of the duct bank encasement.ĥ. These will automatically be configured to create links which will represent the segments forming the outer edges of the duct bank in section. From the Tool Box panel, drag in 4 more points. Consider this the attachment point i.e., the point on the subassembly that will be attached to the assembly base line which ultimately attaches to the alignment/profile.Ĥ. From the Tool Box panel, drag and drop a Point onto the Flowchart panel. Create the CONC parameter for the eventual quantification of concrete volumes.ģ. In the lower right corner panel of Subassembly Composer on the Input/Output Parameters tab, create the custom parameters necessary to connect the 4 corners to any duct bank section that will follow in the corridor. Remember that no spaces are allowed in the subassembly name.Ģ. In the lower right corner panel of Subassembly Composer on the Packet Settings tab, name the subassembly. To create a custom subassembly in subassembly composer:ġ. ![]() Let’s start out by creating the outline of a simple concrete-encased duct bank. The shape of the conduit can be coded so that average end areas and ultimately volumes for concrete can be quantified.Īssemblies with duct bank subassemblies also look very nice in cross-sections.The coding of each conduit center also allows the conduits to connect up when transitioning to another duct bank assembly.The center of each conduit in section can be coded so that conduit lengths can be quantified:.Subassemblies for duct banks can be coded so that quantities can be extracted. Subassemblies for duct banks can be coded to ensure like geometry transitions properly to a change in cross-section. That’s why corridors are great features for modeling duct banks.ĭuct bank corridors can be easily modified vertically with its corresponding profile. One duct bank can change its cross-section several times along an alignment. In my experience, Subassembly Composer has come in very handy when working with concrete-encased duct banks. We do this when we have a need for a subassembly that Civil 3D does not provide. In Subassembly Composer, we are building subassemblies of course. TekFlow for Government and Public Facilities: Better Access to Data.TekFlow for Construction: Increase Efficiency and Productivity.Autodesk Vehicle Tracking Online Courses.Facility Control Systems with Bluebeam Revu.Government & Public Facilities Services.BIM Services for Architecture and Engineering.Bluebeam Tool Chest Customization Services.Practical Use of Autodesk Construction Cloud.We sometimes put two duct banks in a common trench to increase separation, but this is not required by the NEC, AFAIK. It's good practice to keep the 12 kV ducts segregated in one portion of the duct bank. The other option is to provide a barrier of some type within the manhole to isolate the 12 kV from the lower voltages. Then if you use 600 V insulation for all low-voltage cables, they can occupy the same space in a manhole/handhole. We generally split out separate manholes/handholes for the 15 kV (or any medium-voltage) cables. The problem come when you enter a manhole or handhole, since the high voltage must be isolated from the lower voltages. It is permissible to run a 12 kV circuit in one conduit, a 480 V circuit in another conduit and a 24 V dc circuit in a third conduit within a common duct bank. It does not apply to running different voltage system in different conduits within the same duct bank. That NEC article refers to running different voltage systems within the same conduit or cable.
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