Submain

Submain in Australian records

Submain is a cable route term used in Australian records. It often describes a supply run feeding another board or installation section, so the route name needs to stay close to the board, load and cable data being reviewed.

Use submain wording in voltage-drop pages, cable-sizing guides and switchboard load records. The term helps identify the route; it does not by itself decide the cable size, protection setting or voltage-drop allowance.

Where downstream feeders appear

Submain wording appears in submain voltage-drop calculators, switchboard load schedule fields and guides that compare consumer mains, submains and final circuits. It should be used only where the route really is the route under review.

Submain vs consumer mains or final subcircuit

Submain is distinct from consumer mains and final circuit wording. The record should show which route is being reviewed before any voltage-drop result is interpreted.

The term is also not a substitute for current requirements, design documentation or manufacturer data. It only gives the route label that other checks can refer to.

Using submain context in calculations

Use submain voltage drop for entered route values. Use switchboard load schedule fields when submain context sits beside board load records. Keep the route name, phase arrangement and entered values together.