I2t k-value record fields
Record fields for I2t and k-value cable withstand worksheets in Australian protection reviews.
I2t and k-value evidence for withstand checks
Show which source fields should travel with I2t and k-value checks without certifying cable withstand.
| Field | Purpose | Typical source | Boundary |
|---|---|---|---|
| Fault current | Current used in the withstand comparison. | Fault study, calculator or project data | Source and fault location must be recorded. |
| Clearing time | Time value paired with the protective device. | Device curve or manufacturer data | Do not guess clearing time from device label alone. |
| k value source | Source for conductor material and insulation withstand constant. | Governing source document or product data | This table does not publish k values. |
| Conductor context | Material, insulation and size tied to the check. | Cable schedule or product data | Changing cable context invalidates the value. |
| Reviewer and date | Shows who checked the source set and when. | Project record | Stale source values should be rechecked. |
- Use this table to make I2t source values traceable.
- A calculator estimate is not a device coordination study or formal certification.
Before withstand results are compared
Record the protective-device energy and cable k-value context so the withstand calculation can be reviewed against the actual source data.
| Item | Value |
|---|---|
| Purpose | Show which source fields should travel with I2t and k-value checks without certifying cable withstand. |
| How to use the source | Field table only; adiabatic withstand arithmetic lives on the I2t cable withstand calculator. |
| Standards and project context | AS/NZS 3000 and AS/NZS 3008 context noted for project review; verify current source documents and manufacturer data. |
| Where judgement is still needed | Use this table for lookup, labelling or worksheet context; do not treat it as a project-specific calculation result. |
| Before relying on it | Confirm current standards, local authority requirements, DNSP conditions, project documents and manufacturer data before relying on a decision. |
Standards basis for withstand evidence
Keep the standards context, source date and project cable assumptions visible beside each withstand field.
| Item | Value |
|---|---|
| Source | AUWiring I2t cable-withstand calculator field model and Australian protection-review source practice. |
| Source type | AUWiring field model with standards context |
| Derivation basis | AUWiring field table for source-record completeness; controlled k-value, device-curve and standards table values are not reproduced. |
| Last checked | 2026-07-13 |
| Review interval | Annual or when I2t calculator fields, cable-source context, device data practice or standards context changes. |
| Review trigger | Calculator field change, standards update, manufacturer data change or project feedback. |
| Version used | R18-2026-07-13 |
| Australian application | Australia; product data, cable construction, protective-device data and competent review govern formal withstand decisions. |