AS/NZS 3008.1.2:2017

The cable size tool names this clause on a group of circuits in underground enclosures. The clause names Tables 26(1) and 26(2), which the tool reads for one cable per duct. For a duct that holds the whole circuit, Table 3(4) sends circuits that share one enclosure to Table 22. There the tool takes the lower of the Table 26(2) and Table 22 factors and names the table it read.

The cable size tool reads this clause once you enter a third harmonic percentage on a three-phase circuit. It prints the neutral current the harmonic produces, applies the Table 2 reduction factor, and names the clause beside the step so you can check the sizing basis the clause sets. The correction factors tool does the same.

The voltage drop and voltage rise tools use this method. Resistance and reactance are combined at the power factor to give millivolts per amp metre. That figure is then multiplied by the current and the route length.

The voltage drop tool switches to Equation 4.6 of this clause once you enter a neutral current on a three-phase circuit. It then works on a single-conductor basis and prints the neutral drop as its own step, each conductor over its own length.

The fault rating tool works to this clause. It compares the energy let through by the protective device with the energy the conductor can take. The check uses the fault current, the clearing time and the k factor.

The fault rating tool names this clause when the clearing time you enter is longer than the 5 s the clause covers. The result still prints, with a warning that the cited basis stops at 5 s.

The correction factors tool reads the reduction factor for third harmonic current in a four-core or five-core cable. Above 33 %, it sizes on the neutral current.

Verified: read against the printed standard, pages 27–28. Checked 24 Sept 2026.

The cable size tool reads the printed rating here for single-core thermoplastic cable on a single-phase circuit, in copper or aluminium, for each installation method.

Verified: read against the printed standard, pages 35–37. Checked 24 Sept 2026.

The cable size tool reads the printed rating here for single-core cross-linked cable on a single-phase circuit, in copper or aluminium, for each installation method.

Verified: read against the printed standard, pages 38–40. Checked 24 Sept 2026.

The cable size tool reads the printed rating here for single-core thermoplastic cable on a three-phase circuit, in copper or aluminium, for each installation method.

Verified: read against the printed standard, pages 44–46. Checked 24 Sept 2026.

The cable size tool reads the printed rating here for single-core cross-linked cable on a three-phase circuit, in copper or aluminium, for each installation method.

Verified: read against the printed standard, pages 47–49. Checked 24 Sept 2026.

The cable size tool reads the printed rating here for a thermoplastic multicore cable, in copper or aluminium, for each installation method. That figure is the starting point, before any derating.

Verified: read against the printed standard, pages 62–64. Checked 24 Sept 2026.

The cable size tool reads the printed rating here for a cross-linked multicore cable, in copper or aluminium, for each installation method.

Verified: read against the printed standard, pages 65–67. Checked 24 Sept 2026.

The cable size and correction factors tools read the factor for circuits that share a route. More circuits together means a lower factor and a larger cable.

Verified: read against the printed standard, pages 79, 84–87. Checked 24 Sept 2026.

The cable size and correction factors tools read the factor for single-core circuits on a tray, a ladder, a rack or cleats. The factor depends on the support, the tiers, and whether the circuits touch.

Verified: read against the printed standard, pages 80. Checked 26 Sept 2026.

The cable size and correction factors tools read the factor for multicore cables on a tray, a ladder, a rack or cleats. The factor depends on the support, the tiers, and whether the cables touch.

Verified: read against the printed standard, pages 82. Checked 26 Sept 2026.

The cable size and correction factors tools read the factor for the air or ground temperature on the route. A hot route lowers the current the cable can carry.

Verified: read against the printed standard, pages 88. Checked 24 Sept 2026.

The cable size and correction factors tools read the factor for how deep the cable is buried. It applies only to buried cables.

Verified: read against the printed standard, pages 89. Checked 24 Sept 2026.

The cable size and correction factors tools read the factor for the thermal resistivity of the soil. It applies only to buried cables.

Verified: read against the printed standard, pages 90. Checked 24 Sept 2026.

The voltage drop, voltage rise, loop impedance and cable size tools read conductor resistance and reactance at the operating temperature from this data. The loop power budget reads the conductor resistance.

Verified: read against the printed standard, pages 98, 102–103. Checked 24 Sept 2026.

This table gives one flat k factor per material and insulation. The cable size and fault rating tools read Table 52 from the short-circuit limits table instead. There, the k factor depends on the temperature limits Tables 53 and 55 set.

Verified: read against the printed standard, pages 121–122. Checked 19 Sept 2026.

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.