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Cable schedules are documents prepared by instrumentation and control engineers that list the cables and junction boxes required for a project. They include cable numbers, types, sizes, lengths, and termination details. Cable schedules are used as a reference for material procurement and during the construction phase. However, the actual cable lengths may differ in the field, and it is not recommended to cut cables based solely on the length stated in the cable schedule. Cable schedules can be generated using software such as ElectricalOM, which allows users to select specific cables and view detailed termination information. Additionally, tools like Cable Scheduler enable cable core/conductor assignments and automatic generation of wiring diagrams.
| Characteristics | Values |
|---|---|
| What | A cable schedule is a document that lists the cables and junction boxes needed for a project. |
| Who | Cable and junction box schedules are prepared by instrumentation and control engineers. |
| When | Cable schedules are used for material procurement and are referred to during the construction phase. |
| Where | Cable schedules are used to determine the cables and junction boxes required for a project. |
| Why | Cable schedules provide essential information for project planning and procurement, including cable numbers, types, sizes, lengths, and termination details. |
| How | Cable schedules are created using tools like Cable Scheduler, which allow for the assignment of wires to cable cores and the management of connection details in a database. |
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What You'll Learn
- Cable schedules are prepared by instrumentation and control engineers
- Cable schedules list cables and their numbers, types, sizes, lengths and termination details
- Cable schedule lengths are approximate and should be cut in the field
- Cable schedules can be exported to CAD or MS Excel
- Cable Scheduler allows components and connection details to be created in a database
Cable schedules are prepared by instrumentation and control engineers
The process of preparing a cable schedule involves interface engineering and cable routing. Interface engineering focuses on connecting cables between various panels or devices in different locations. This includes assigning wires to cable cores and ensuring that cable names and destination enclosures are known. Cable routing, on the other hand, involves applying a list of cables to a raceway network plant model, resulting in cable lengths, raceway filling, and cross-section reports.
In addition to the cable schedule, engineers also prepare a Junction Box (JB) schedule. The JB schedule details the junction box, which is an enclosure for cables interconnected between field devices and the control room. It includes information on terminal strips for cable termination and the environmental conditions in which the junction box will be installed. Similar to the cable schedule, the JB schedule is referenced during the construction phase, but it is not recommended to rely solely on its location information for JB installation.
Overall, the preparation of cable schedules by instrumentation and control engineers is a critical aspect of project engineering. It involves detailed planning and consideration of various factors to ensure the successful implementation of cable and junction box installations. By following the cable schedule, engineers can make informed decisions during the procurement and construction phases of a project.
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Cable schedules list cables and their numbers, types, sizes, lengths and termination details
Cable schedules are documents prepared by instrumentation and control engineers that list the cables and their details needed for a project. Cable schedules are used as a reference in preparing Material Take-Off of cables for procurement. While cable schedules are referred to during the construction phase, it is not recommended to cut the cables based on the length stated on the schedule. The cable length shown on the document is only approximate, and there should be a contingency for material procurement to allow for unexpected barriers in the field.
Cable schedules list the cable numbers, types, sizes, lengths, and termination details. Cable names and destination enclosures may be known before using a Cable Scheduler. The Cable Scheduler is a tool that allows components and connection details to be created in a database. These details are then included in the standard EDS reports for materials and detailed connection lists.
To use the Cable Scheduler, you should have your project schematics linked to the EDS project. The drawing-based wires should be displayed in the Cable Scheduler interface in the WIRES FOLDER. You will then narrow down the number of wires in your view to a workable set using the FILTER and SORT options in the WIRES list view. After using the Cable Scheduler, your EDS project will be updated to include all of the cable termination details, allowing for automatic wiring diagrams.
Termination details for the cables are generally not available before using a Cable Scheduler. However, the need for connection and the signal names (and/or wire names) are known and are present on a set of schematics. The cable termination details are added after using the Cable Scheduler, allowing for automatic generation of wiring diagrams, terminal strip diagrams, and cable termination lists.
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Cable schedule lengths are approximate and should be cut in the field
Cable schedules are important documents that provide detailed information about the types of instrumentation cables used in a facility. They are used to determine how much cable is needed for a project and to ensure that the correct cables are ordered and installed. While cable schedules are essential references, the cable lengths indicated are only approximate values. Therefore, it is not recommended to cut cables based on the length stated on the cable schedule.
Cable lengths in a cable schedule are approximate because they are meant to serve as guides for material procurement and installation. The actual cable length required for a specific application may vary depending on several factors and unexpected obstacles. For example, during installation, the cable may encounter unexpected barriers or require additional length for service loops or risers. Therefore, it is essential to have a contingency plan and allow for some spare cable during procurement.
Service loops, also known as service slack, refer to the excess cable length added to the planned drop length. They are not intended to account for mistakes during installation but rather to provide flexibility and accommodate uncertainties. Service loops are commonly found at both ends of the permanent link in a structured cabling system. It is important to note that while you can always cut off any excess cable, it is difficult or impossible to add length back if you cut too much.
During the construction phase, the common practice is to pull the cable from its drum and cut it in the field. This allows for adjustments to be made based on the specific requirements and conditions encountered during installation. By cutting the cable in the field, installers can ensure that the cable length is precise and optimized for the given application. Therefore, cable schedule lengths are meant to be approximate and should be fine-tuned during the installation process.
In summary, cable schedule lengths are approximate values that provide a starting point for material procurement and installation. By allowing for some variation and cutting the cables in the field, installers can ensure that the final cable length is accurate and tailored to the specific requirements of the project. This approach helps to mitigate uncertainties and unexpected obstacles that may be encountered during the installation process.
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Cable schedules can be exported to CAD or MS Excel
The Export Excel button will run MS Excel instead of saving the schedule as a file directly, so the user must have MS Excel installed on their system before running this command. The Insert to Schematic button will switch to the Schematic Module's drawing area with Drawing mode enabled, allowing the user to select a location for the cable schedule. Once the left mouse button is clicked, the cable schedule table will be placed in this location on the schematic.
To delete an inserted cable schedule table, Drawing mode must be used. The Replace Existing button is used to replace an existing cable schedule table with a new one after changes have been made to the original.
Cable Scheduler is a Windows app that can be used to parse data from wiring CAD drawings to create cable schedules with a single click. It is an alternative to manually entering data into Excel or other software such as ConnectCAD, VidCAD, D-Tools, and Star Draw.
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Cable Scheduler allows components and connection details to be created in a database
Cable Scheduler is a tool designed primarily for project engineering companies that perform "interface engineering" and "cable routing". Interface engineering involves connecting cables between various panels or devices in different locations. Cable Scheduler allows users to create components and connection details in a database, which can then be included in standard EDS reports for materials and detailed connection lists.
The Cable Scheduler database is used to create cables and their associated details, such as termination information. While the termination details for the cables may not be available before using Cable Scheduler, the need for connection and the signal or wire names are typically known and present on a set of schematics. Cable Scheduler allows for easy cable selection and core allocation for inter-panel engineering.
Cable routing, on the other hand, involves applying a list of cables to a raceway network plant model. This results in the generation of cable lengths, raceway filling, cross-section reports, and pull cards. Cable Scheduler offers auto-routing, semi-auto routing, and manual routing options for this process. Additionally, Cable Scheduler automatically reports cable lengths, drumming, raceway fills, and routes, simplifying the reporting process.
Cable Scheduler also integrates with other software, such as Paneldes, for auto-routing functions. This integration ensures that cable routing results can be easily calculated and reported, reducing the time and expense typically associated with this process. The output from Cable Scheduler is typically report-based, providing actionable information for cable installers.
Overall, Cable Scheduler streamlines the process of creating and managing cables and their associated details in a database. By offering various routing options and automatic reporting, it simplifies the complex task of cable scheduling and improves efficiency for project engineering companies.
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Frequently asked questions
A cable schedule is a document that lists the cables and junction boxes required for a project. It includes cable numbers, types, sizes, lengths, and termination details.
A cable schedule typically includes cable numbers, types, sizes, lengths, and termination details. It may also include a list of instrument JB (junction boxes) with the cable and gland required by each instrument or connection.
Cable schedules can be created using software such as ElectricalOM or Cable Scheduler. These programs allow users to select cables, view cable schedules, and export them to CAD or MS Excel.
Cable schedules are used as a reference for material procurement and during the construction phase of a project. They help determine the cables and junction boxes needed and provide details such as cable numbers, types, sizes, and lengths.
No, the actual cable lengths and box locations may differ in the field. While cable schedules provide approximate cable lengths, it is not recommended to cut cables or install boxes based on this information. Instead, common practice involves pulling the cable from its drum and cutting it in the field.
