AS/NZS 3008.1.1:2025

Table 5.1

Values of constant K for determination of permissible short-circuit currents

This table gives one K per material and insulation. The cable size and fault rating tools read K from the short-circuit limits data instead.

Verified: read against the printed standard, pages 152. Checked 27 Sept 2026.

Units: K A·s^0.5/mm2

These are the values AmpSize encodes. No text of the standard is reproduced. Verify against the current standard.

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Table 5.1, Values of constant K for determination of permissible short-circuit currents
Material	Insulation	Initial temp C	Final temp C	K (A·s^0.5/mm2)
Cu	PVC	75	160	111.2
Cu	XLPE	90	250	142.9
Al	PVC	75	160	73.7
Al	XLPE	90	250	94.6

Tools that read it (4)