Technical resources for engineers and specifiers.
Standards interpretation, specification guides, and sizing tools — written for electrical engineers, MEP consultants, and procurement teams.
Browse technical documentation.
Each guide is written from a practical engineering perspective — focused on specification decisions, not marketing language.
When to specify each insulation family. Explains the chemical differences and the test limits each type meets under IS 694:2010 and IS 17048:2018.
Read guide →Both IS 694:2010 PVC wires. FR-LSH adds two combustion limits — halogen acid gas ≤ 20% and smoke density rating ≤ 60% — that plain FR does not have.
Read guide →Different standards and insulation chemistry. FR has no smoke or halogen limit; LSZH/HFFR (IS 17048:2018) is limited to 0.5% halogen acid gas.
Read guide →Halogen acid gas 20% vs 0.5% — a 40-fold difference in the permitted limit. Separate standards, separate BIS licences, not interchangeable.
Read guide →What National Building Code 2016 Parts 4 and 8 say about flame retardant, FR-LSH, and circuit integrity cables, with clause references.
Read guide →Plain-English definitions for terms used in datasheets, tender documents, and test reports — from conductor classes and oxygen index to IACS and Uo/U voltage grades.
Browse glossary →Demystifies Class 1, 2, 5, and flexible conductor classifications. Covers strand count, flexibility requirements, and which class is appropriate for fixed versus flexible wiring.
Read guide →Enter load, run length, and installation method. Get conductor size with voltage drop calculation, de-rating factors, and the matching National Cables product. Covers IS 694:2010, IS 3961 (Part 2):2017, and IEC 60364.