Voltage drop
Voltage drop meaning in Australian cable records, with calculators, tables, charts and guides linked.
Voltage drop in Australian records
Voltage drop is the reduction in voltage along a cable run. AUWiring records it as volts and percent from entered project values, with the voltage basis, current, length, conductor material and route context kept visible.
The term often appears beside Australian 230/400 V a.c. supply notes, metric cable sizes and cable-sizing guides. It is a calculation check tied to assumptions, not a final cable selection by itself.
Where voltage-drop assumptions appear
Voltage drop wording appears in cable voltage-drop calculators, submain worksheets, formula charts and cable-sizing guides. It becomes useful only when the route and entered values are specific enough for the result to be interpreted.
| Record context | Keep visible | Why it matters |
|---|---|---|
| Final circuit or submain route | length, current, phase and voltage basis | Shows which cable run the result belongs to |
| Formula chart | voltage-drop relationship and units | Keeps the relationship separate from a project answer |
| Cable selection note | voltage drop and current-carrying capacity as separate checks | Prevents one cable check from being treated as the whole selection |
Voltage drop vs supply voltage
Voltage drop is not the same as current-carrying capacity, short-circuit rating or final cable selection. It is one cable check that must stay tied to its assumptions.
This glossary page does not reproduce controlled table values or approve a cable size. Use the calculator and guide with current project data, licensed tables and the relevant project requirements.
Using voltage-drop results
Use the voltage-drop calculator for entered project values. Use the formula chart to understand the relationship behind the result, and use the cable guide when the result needs to sit beside other cable checks.
Source and review
Check the terminology source, review timing and Australian application before carrying this term into a project record.
| Item | Value |
|---|---|
| Source | AUWiring voltage-drop calculator wording, voltage-drop formula chart and cable sizing guide content. |
| Source type | Australian terminology |
| Derivation basis | AUWiring Australian glossary term; no controlled AS/NZS 3008 table values are reproduced. |
| Last checked | 2026-07-13 |
| Review interval | Annual terminology review or sooner if voltage-drop calculator or chart wording changes. |
| Review trigger | Update when voltage-drop formulas, cable calculators or cable guides change. |
| Version used | T15-2026-07-13 |
| Australian application | Australia; Australian English cable calculation terminology. |