AS/NZS 3008.1.2:2017

Table 52, 53, 54, 55

Short-circuit K values and temperature limits

The fault rating tool reads the k factor for the conductor start temperature and the short-circuit temperature limit. The limit comes from the insulation class and the conductor size band, or from the joint in the run when the joint is the lower of the two.

Verified: read against the printed standard, pages 121–123 (PDF 125–127), with Table 1 on page 13. Checked 26 Sept 2026.

Units: K A*s^0.5/mm2, Initial temp C degC, Final temp C degC, Max size mm 2 mm2

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

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43 rows

Table 52, 53, 54, 55, Short-circuit K values and temperature limits
Kind	Material	Initial temp C (degC)	Final temp C (degC)	K (A*s^0.5/mm2)	Insulation class	Max size mm 2 (mm2)	Joint
k	Cu	110	140	65.3
k	Cu	110	150	74.9
k	Cu	110	160	83.2
k	Cu	110	220	119
k	Cu	110	250	132
k	Cu	110	350	164
k	Cu	90	140	85.6
k	Cu	90	150	93.1
k	Cu	90	160	99.9
k	Cu	90	220	131
k	Cu	90	250	143
k	Cu	90	350	173
k	Cu	75	140	98.7
k	Cu	75	150	105
k	Cu	75	160	111
k	Cu	75	220	140
k	Cu	75	250	151
k	Cu	75	350	180
k	Al	110	140	43.2
k	Al	110	150	49.5
k	Al	110	160	55
k	Al	110	250	87.1
k	Al	90	140	56.6
k	Al	90	150	61.5
k	Al	90	160	66
k	Al	90	250	94.5
k	Al	75	140	65.2
k	Al	75	150	69.6
k	Al	75	160	73.6
k	Al	75	250	99.9
insulation		75	160		thermoplastic-75	300
insulation		75	140		thermoplastic-75
insulation		90	250		cross-linked-90
insulation		110	250		cross-linked-110
joint			250				exothermic-welded
joint			160				soldered
joint			250				compression
sheath	thermoplastic		200
sheath	polyethylene		150
sheath	high-density-polyethylene		180
sheath	polychloroprene-or-csp		200
sheath	lead		170
sheath	lead-alloy		200

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Fire

Regulatory

Table 52, 53, 54, 55

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