Verifying the Copper Connection of a CAD Net Tie

A net tie preserves separate net identities while creating an intentional physical copper connection. Its purpose is specific: two or more nets meet at a defined location. Review both the CAD exception and the finished copper geometry so the design does not rely on a label that hides a missing or unintended connection.

Define the intended electrical boundary

KiCad’s PCB Editor documentation describes net-tie groups that permit selected footprint pads to connect. That permission does not replace the copper required to join them. The footprint must represent the intended connection and keep unrelated groups separate.

State why the nets remain distinct in the schematic and where they should meet. Identify current paths, sense connections, or reference boundaries that depend on the location. Avoid choosing a net tie merely to silence a clearance error without understanding the circuit consequence.

Inspect the actual bridge

1. Map each net to its assigned pad in the footprint.
2. Confirm that the permitted group includes only the intended pads.
3. Inspect the connecting copper shape on every affected layer.
4. Check width, clearance, and surrounding zone behavior.
5. Review the exported manufacturing image at the same location.

For example, a schematic connection may be intended to separate a sensitive sense path from a load-current route until they meet at one point. An unintended second copper connection elsewhere defeats that geometry even if the net-tie footprint itself is correct.

Keep checks focused around the exception

Run DRC after zone refill and examine the surrounding copper rather than only the footprint pads. A local exception should not remove scrutiny from nearby clearances or other net groups. When a footprint contains several independent net ties, verify their separation explicitly.

Check that a library update has not changed pad numbering, bridge shape, or group configuration. A footprint that looks similar at normal zoom can carry different connectivity semantics.

Release the reason for the tie, the physical location, and the reviewed footprint revision together. Include an annotated copper view where it helps communicate the intended current path. If the tie’s location moves, reassess the electrical purpose rather than treating the change as ordinary component placement.

The accepted result should show one controlled copper relationship that matches the schematic intent and manufacturing outputs. It should also preserve the ability of normal clearance checks to detect unrelated mistakes elsewhere on the board.

Where current or voltage-drop performance matters, evaluate the bridge’s physical geometry as a conductor; its special CAD status does not provide electrical capacity by itself.