Resources

Engineering references

Reference tables and formula sheets you can rely on, each with its source.

Conductor resistance tablesNEC Chapter 9 Table 8 and IEC 60228 conductor resistances, copper and aluminium.Electrical formula sheetThe core power, Ohm’s law, transformer and voltage-drop formulas in one place.DownloadsData tables in CSV format for your own spreadsheets.

Standards hub

Plain-language summaries are in preparation for IEC 61850 (parts 6, 7-4, 8-1, 9-2), IEEE 1815 (DNP3), IEEE C37.2 device numbers, IEEE C37.112 and C37.110, NERC CIP and PRC standards, NEC and CSA C22.1. We summarize and cite clause numbers; the standards themselves are available from their publishers.