History of this Electrical Panel Schedule App
This Electrical Panel Schedule package has been in use for over 20 years. After encouragement from several people in the industry, the decision was made to release this Electrical Panel Schedule package to the Electrical Design community at large.
Through the years, each new version of the Electrical Panel Schedule has introduced more capabilities and more time saving tools. Today, the Electrical Panel Schedule is a comprehensive design tool leveraging years of use and experience into an easy to use Design Tool that takes the “tedious” out of Load Calculations, Short Circuit Calculations, Voltage Drop Calculations, and Schedule Creation.
We have seen labor savings averaging between 50 – 80 man-hours annually for each designer/engineer depending on the designer/engineer and the project types over the less automatic system of creating schedules and running calculations used in the past. These applications also provide the peace of mind that all calculations are consistent and accurate independent of the designer/engineer running the calculations.
One of the unexpected benefits discovered early after we implemented the first edition of this application was dealing with the last minute changes that are inevitable on many projects. This Application automatically updates all load calculations, short circuit calculations, and voltage drop calculations for the entire project when the active bus is exited. When these schedules and calculation tables are live-linked into the drawings, the information in the drawings is updated when the drawing is opened. The time and frustration issues associated with last minute changes from other disciplines have been significantly reduced.
Technical Specifications
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These Excel® Document Level Customizations are designed to run on the most recent version of Microsoft Excel®, 64 bit version.
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This application will accommodate up to 512 buses which far exceeds the largest project requirements used to date.
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The Load Calculations included in this Electrical Panel Schedule include all diversities permitted by the respective edition of NFPA® 70, the National Electrical Code®.
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All calculations are vector based (VA @ assigned pf). The assigned power factor is shown for each load type in all load calculation tables for reference.
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Short Circuit calculations use the procedures described in the IEEE Standard 141 (IEEE Red Book) chapter 4.
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Voltage Drop calculations use the procedures described in the IEEE Standard 141 (IEEE Red Book) chapter 3.
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Conductor impedances use data from IEEE Standard 141 (IEEE Red Book) chapter 4, Annex 4A.
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Bus duct impedances use data from the Eaton® line of bus duct products.
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Transformer impedances use data from the Eaton® line of dry-type transformers.
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When Open Transition Transfer Switches are included in a project, the available fault current from each source is calculated and the largest value is used for each bus.
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When Closed Transition Transfer Switches are included in a project, the available fault current from all sources on both sides of the transfer switch is included in the calculation.
The size of a fresh Excel® Electrical Panel Schedule file is less than 5 MB. The size of this file will grow as more buses are added to the project.