Cable Assembly Testing Explained: Continuity, Short Circuits and Pull Force

“Tested” is not a complete acceptance specification. A wiring check, a terminal pull test and a check of the installed cable restraint answer different questions. A purchasing team needs to know which property was checked, against which drawing and limits, and on every assembly or on selected samples.

Zeakka's confirmed scope is continuity and short-circuit testing on every cable assembly, with pull-force testing sampled and defined for the project. The method, limits and requested records must be agreed for the actual build. This guide explains how to define that scope without treating a simple pass result as proof of every electrical or mechanical property.

What each result actually tells you

The last two rows describe separate requirements that a project may need to evaluate. They are not a statement that these checks are included in every Zeakka order. Specify an additional requirement explicitly so its feasibility and scope can be reviewed.

Continuity needs a map and a limit

Continuity testing must use the approved electrical connection map, including branches, joined circuits and intentionally unused positions. A result can agree with the loaded test program while the program itself represents the wrong drawing revision. Review the relationship between the drawing, fixture connections and test definition before approving production.

An audible beep is not a universal acceptance criterion. The selected resistance limit must suit the actual cable and test setup. Cirris explains that a tester distinguishes intended and unintended connections using resistance thresholds and that nominal wire resistance matters when choosing settings. Its published example settings are guidance for those test systems, not automatic limits for a Zeakka project. Cirris resistance-threshold guidance

Identify the part number and revision covered by the result, the required connections, the applicable limit and whether a pass/fail record or measured values are requested. A bare “PASS” without that context is difficult to compare between suppliers or production changes.

For numbering and viewing conventions, use the cable pinout and polarity guide. The test specification should reference that approved map rather than create a second, potentially conflicting pinout.

A short-circuit check is not a high-voltage test

A short check concerns connections that should not exist in the specified circuit. Define intentional common connections, shields and any embedded components before establishing the test program. Otherwise, a legitimate connection may be classified incorrectly or an unwanted connection may be omitted from the intended coverage.

Do not interpret a short-circuit pass as an insulation-resistance or dielectric-withstand result at a particular voltage. Cirris distinguishes low-voltage resistance checks from higher-voltage insulation testing. If an application requires insulation resistance, dielectric withstand, signal testing or testing of embedded components, state that requirement separately for feasibility review; those capabilities are not established by the standard continuity-and-short scope. Cirris test-threshold distinctions

Likewise, a cable that passes its wiring test has not thereby demonstrated that the connected equipment has the correct polarity, power sequencing or function. Those depend on the equipment requirements and any separately agreed system validation.

Define which part of the assembly is being pulled

For a terminal-to-wire crimp test, identify the exact terminal, wire construction and tooling specification. The method must define specimen preparation, what is held, the direction and rate of loading, and the acceptance criterion. Molex directs users to the applicable Application Tooling Specification for crimp height, pull force and strip length. A force copied from a similar-looking terminal is not a substitute. Molex application tooling guidance

Terminal retention asks whether the contact is secured inside its housing. That retention mechanism is distinct from the conductor crimp; secondary retention features also depend on the connector design. An assembly strain-relief test instead examines the defined cable restraint and how the load reaches it. These tests cannot be renamed interchangeably just because all involve pulling. Molex contact-retention explanation

Agree whether the test is destructive or a specified proof-load procedure and how tested samples will be handled. Do not assume a pulled sample remains suitable for shipment. If failure occurs, record what moved or failed; the peak force alone may not identify the weak interface.

Separate inspection frequency from acceptance criteria

“Every assembly” describes coverage. It does not define the test limits, prove a test program is correct or guarantee detection of a fault outside that test's conditions. A stationary wiring check also should not be described as a repeated-flex or vibration qualification.

For sampled mechanical checks, agree the sample selection, timing, quantity and response to a failure. A sample result applies to the stated test and sampling plan; it does not mean that every finished assembly was mechanically tested. Avoid adding an arbitrary sample rate or load to the drawing merely because another supplier used it.

For custom cable assemblies, send the drawing revision and connection map together with the required test scope. Mark which checks are required on every unit, which are sampled and which additional requirements need review. Specify any requested record format before the quotation is finalized.

Zeakka coordinates these requirements with the selected supplier as a trading and sourcing partner. Use the RFQ checklist to organize the remaining project inputs, then contact Zeakka with the acceptance requirements. The useful outcome is an agreed test plan for your assembly, not an unspecified promise that a cable is “fully tested.”