Derating Factor Matrix — 4 Standards Comparison

Derating factors can make or break a cable design — an 80A cable might only be good for 50A after temperature and grouping corrections. This A3 poster presents a combined derating factor matrix covering all four major standards: AS/NZS 3008 (Tables 22/25/27), BS 7671 (Tables 4B1/4C1), IEC 60364 (Tables B.52.14/17), and NEC (Table 310.15(B)(1)). The matrix uses a clear color gradient — green (>0.8), amber (0.6–0.8), and red (<0.6) — so you can instantly spot where aggressive derating applies. A side panel covers soil thermal resistivity correction factors for direct-buried cables. Essential for engineers who frequently cross-reference derating factors across different standards, or for training rooms teaching multi-standard cable sizing methodology.