Imperial cable size converter

The tool reads AS/NZS 3000:2018 Table I1. Pick the imperial size, the insulation and the installation method. AmpSize then reports the largest circuit-breaker the table prints for that conductor. It also reports the largest existing fuse or existing plug-in circuit-breaker. Appendix I gives the scope.

No. AmpSize treats the second column of Table I1 as an existing device only. Clause 2.5.2 governs that point, and Note 2 under the table points at it. Use that rating where a rewireable fuse or a plug-in circuit-breaker is already in place on an alteration or a repair.

AmpSize calculates the conductor area from the wire count and the wire diameter, then reports the nearest standard metric size. That area is arithmetic, not a value read from the standard. AmpSize does not encode Table I2, the table for cables connected in parallel. Read it in the standard for that case.

No. Note 1 under Table I1 sets the conditions the ratings hold under. Read it on the page. Then check the route, the grouping and the voltage drop before you rely on a value.