AmpLookUp 1.0

The calculation of underground duct banks, much like voltage drop assessments, is not mandated by the NEC; however, local authorities may impose such requirements. Neher-McGrath calculations play a vital role, particularly in scenarios where conductors are expected to operate at full load capacity. An illustrative example of this is in data center design, where precise load considerations are critical.

Multiple specialized software tools are available to facilitate these calculations, though their use may be necessary to accommodate specific installation parameters. The NEC offers guidance on this topic, but applying its provisions thoroughly can be a complex and time-consuming process.

In this context, the referenced application provides a convenient lookup for relevant NEC data. Anyone familiar with Annex B knows the challenge of navigating its double charts—this tool simplifies that process by automating certain calculations and referencing pertinent textual guidance, such as requirements for two-cell duct banks.

We welcome and encourage user feedback to improve the utility and accuracy of this application.