Cable & Protection

Circuit schedule

The table lists populated distro outputs and takes each circuit's design current from Load & Demand. Equipment cannot be edited here.

Select All distros or filter the table to one distro. The floating horizontal scrollbar remains available while moving down a wide table.

Selecting cable data

Select a compatible cable from the shared standard library or the current project's cable library. Standard records are centrally maintained and read-only, while project records are created from the Cable Library subtab.

Only ratings included for the current project appear for new selections. An excluded rating remains visible on a circuit already using it, and the selected reference values are saved as an immutable snapshot within the project.

Choose Custom cable data where the required cable is not in the library. Enter a clear cable name, current capacity and voltage-drop value in mV/A/m. Custom values apply only to the current project.

Installation inputs

Length is the cable section length in metres. Parallel runs is the number of equivalent cables sharing the circuit current. Derating is a factor between 0.01 and 1.00 applied to the combined cable capacity.

Adjusted capacity equals library capacity multiplied by parallel runs and the derating factor. Utilisation is design current divided by adjusted capacity, expressed as a percentage.

Voltage-drop results

Section drop is calculated from the cable's mV/A/m value, circuit design current and section length, divided across parallel runs. Cumulative drop includes the calculated drop from upstream feeder sections.

End voltage is nominal voltage minus cumulative voltage drop. Choose Lighting 3%, Other 5% or enter a custom voltage-drop limit appropriate to the design basis.

• Section drop describes the current cable section only.
• Cumulative drop follows the source and downstream distro hierarchy.
• The selected limit is assessed against cumulative—not merely section—voltage drop.

Pass, Review and Fail

Pass means the cable length is complete, design current does not exceed adjusted capacity, cumulative voltage drop is within the selected limit, and the current cable data and assumptions have been designer verified.

Review means the cable length is incomplete or the current data and assumptions have not been verified. Hover over the status to see the recorded reasons.

Fail means design current exceeds adjusted cable capacity or cumulative voltage drop exceeds the selected limit. Change the design inputs or upstream arrangement and reassess; verification alone cannot turn a failed calculation into a Pass.

Designer verification

Select Verify only after checking the cable data and installation assumptions. The planner records the authenticated designer identity, time and a fingerprint of the calculation inputs.

Changing the cable, length, parallel runs, derating, voltage-drop limit or design current invalidates the verification automatically. Review the revised calculation and select Verify again. Select Verified to remove an existing verification manually.

Resolving a result

Work through the circuit inputs in order, correcting any failed boundary before completing designer verification.

1. Select the correct library cable or enter complete custom cable data.
2. Enter the cable length, parallel runs and a justified derating factor.
3. Choose the applicable voltage-drop limit.
4. For Fail, increase suitable capacity, revise the circuit arrangement, reduce justified design demand, shorten the route or otherwise correct the design.
5. For Review, complete the missing length and check every cable and installation assumption.
6. Select Verify after the competent review. Confirm that the result changes to Pass and that no upstream failure remains.