What's inside
1
IEC 60909 voltage factor c by voltage level (max/min)
IEC 60909:2016 Table 1
2
Transformer correction K_T formula and typical value (0.95)
IEC 60909:2016 §3.3.3
3
IEEE 80 touch and step voltage limits — 50kg/70kg, varied ρs and clearing time
IEEE 80:2013 §8.3
4
XLPE cable derating factors — grouping, temperature, thermal insulation
IEC 60364-5-52
Related calculators
The cheatsheet is the table. These tools run the full calculation.