Voltix Blog
Electrical wiring guides & calculator tutorials
Clear, practical explanations of the calculations electricians run every day - voltage drop, conductor sizing, conduit fill and the differences between NEC, BS 7671 and AS/NZS. Each guide is written for working professionals and pairs with our free online calculators.
10 May 2026 · 8 min read
Voltage Drop: What It Is, How to Calculate It, and NEC/BS 7671 Limits
Voltage drop is one of the most common compliance checks on site. Here is exactly what it is, why it matters, and how to calculate it under both NEC and BS 7671.
Read guide12 May 2026 · 9 min read
NEC Wire Sizing Guide: How to Size Conductors to NEC 310.16
Sizing conductors correctly under the NEC means more than reading one column of a table. Here is how temperature ratings, derating and the 80% rule fit together.
Read guide15 May 2026 · 9 min read
BS 7671 Cable Sizing: A Step-by-Step Guide for UK Electricians
Ib, In, Iz - the three currents at the heart of BS 7671 cable sizing. This guide walks through each correction factor with a worked domestic example.
Read guide18 May 2026 · 7 min read
NEC Conduit Fill: What the 40% Rule Really Means and How to Calculate It
Everyone quotes the '40% rule' but few explain when it applies. Here is what NEC Chapter 9 actually requires and how to calculate fill for mixed wire sizes.
Read guide22 May 2026 · 12 min read
NEC vs BS 7671 vs AS/NZS: How the Three Electrical Standards Compare
Three standards, three philosophies. This comparison maps NEC, BS 7671 and AS/NZS against each other so you can switch between them with confidence.
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