An engineering reference, not a storefront

What Voltfield is

Voltfield is an independent engineering reference and free tools platform. It isn't a distributor and doesn't warehouse or ship parts itself — the catalog exists so you can look up an exact specification and see indicative price and lead-time reference data for it. Exactly how that reference data is compiled is covered in full on the methodology page.

What's actually on the site

How the guides and calculators are written

The 33 engineering guides and the calculator pages are written by Voltfield's editorial team to one set of rules. The methodology page sets them out in full; in short:

• Answer first. The opening paragraph answers the question the page is named for, and the detail follows.
• Show the working. Where there is a number to calculate, the page works through it with figures you can reproduce from the formulas shown. The calculator pages explain the method each tool uses, not just the result.
• Name the standard. Guides cite the standard that governs the topic (the NEC, NFPA 70E and 855, IEEE 519, IEEE/ANSI C57 and so on), and each ends with a Scope & sources section listing what it rests on.
• Say what it does not cover. Nothing here replaces a licensed engineer's stamped calculation, a protective device coordination study or a code sign-off, and the pages say so where it matters.
• Date it. Each guide shows when it was published and when it was last updated. Those dates come from the site's revision history, not from a date typed in by hand.

Corrections

When something on Voltfield is wrong, it gets fixed. For example, the arc-flash calculator page once said incident energy rises with the square of arcing time. It rises in direct proportion to arcing time, which is what the calculator itself had always computed, and the page now says so. If you find an error or an out-of-date figure, email Help@voltfield.org. New guides, calculators and tools are listed, most recent first, on What's new.

Citing and embedding Voltfield

Every guide ends with a ready-to-paste citation that includes its address and last-updated date. The Lead-Time Index is also published as a JSON feed, with each figure labeled by its basis, and as an embeddable widget. The voltage drop, transformer sizing and power factor calculators can be embedded on another site with a short copy-paste snippet, given on each of those pages.

Independence

Voltfield names manufacturers and product lines because engineers specify against them. It is not affiliated with, sponsored by, or endorsed by any manufacturer it references, and nothing on the site is for sale.

How Voltfield is positioned

This wasn't always the framing. The site originally read like a parts storefront — "sold and fulfilled directly," add-to-cart language, checkout flows. That has been rewritten sitewide. What replaced it is a reference: you can look up a family, see how it is specified, what standards apply, roughly what it costs and roughly how long it takes. There is no request to send and no one to send it to.

Contact

Questions about the tools, the data, or a correction: Help@voltfield.org  ·  +1 (850) 686-1378.