An electrician tests an installed charger with three families of tools: installation testers that prove the circuit, an EVSE test adapter that plays the part of the car, and load and thermal observation while a session runs. Our guide on how to test an EV charger lists the tools; this article is about the visit itself — the order the tests run in, what each one proves, and the verdict you are paying for.
Key Takeaways
- A service visit runs in order: prove the circuit, simulate the car, observe under load.
- Installation testers measure what behaviour cannot — insulation, earth path, protective response, voltage under load.
- The EVSE test adapter removes the car from the suspect list and repeats the failing state exactly.
- The visit ends in one of four verdicts, and each verdict names who acts next.
Stage One: Prove the Circuit Before Blaming the Charger
The visit starts on the installation side, because a charger fed by a faulty circuit misbehaves in ways that look exactly like charger faults. The circuit tests run as families:
| Test family | What it proves | If it fails |
|---|---|---|
| Insulation resistance | Cable insulation is intact, no leak path developing | An installation fault — the wiring, not the charger |
| Earth continuity and loop testing | The earth path is complete and can clear a fault | An installation fault, and a safety one |
| Protective-device trip test | The breaker or RCD side responds as designed | The protective device or its circuit — electrician’s repair |
| Voltage under load | The supply holds up while real current flows | A weak connection somewhere in the run, exposed only under load |
Behaviour can hint at these faults; it cannot measure them — a car charging normally says nothing about the earth path it never needed.
Stage Two: The Box That Plays the Car
With the circuit proven, the electrician plugs an EVSE test adapter into the charger’s connector. The adapter presents the states a vehicle presents — connected, ready, requesting power, finished — reads the current the charger advertises, and can present a fault stimulus so the protective response can be watched safely. The charger can be tested with no car present, removing the car from the suspect list by design. And the state that fails at home can be repeated identically, as often as the diagnosis needs — something no real car will ever do. Factories use deeper bench simulators at production scale; the adapter is the visit version.
Stage Three: Watch It Work, Warm
The last stage is observation under a real session: connections and terminals are checked for abnormal heating while the unit works. Some faults exist only warm — a connection sound when cold and resistive when hot passes every earlier stage and fails this one.
The Four Verdicts a Visit Can Give
| Verdict | What it means | Where it goes next |
|---|---|---|
| Circuit fault | The installation fails a measured test | The electrician repairs the installation |
| Charger fault | The circuit proves out; the charger fails the adapter or the load stage | The manufacturer, under warranty where it applies |
| Car side | The charger behaves correctly for the adapter in every state | The car goes to its dealer with that result in hand |
| No fault found | Everything passes under test conditions | The record is the product: conditions noted, logging continues |
Have the failure pattern ready before the visit: when it happens, what the charger showed, what else was running.
EVDANCE Units and the Service Route
The same visit logic scales. On a site, a dual-connector station such as the EV-AC03201T — two Type 2 connectors sharing up to 43 kW, with OCPP 1.6J and RFID — is where instrument testing earns its keep, separating a station fault from a supply fault when two connectors share one feed. A wallbox such as the EV-ACT3204E gets the same three stages. If a visit convicts an EVDANCE unit inside its 3-year standard warranty, contact us with the verdict recorded.
Frequently Asked Questions
Why can’t the electrician just watch my car charge?
Because a car is one uncontrolled partner: it changes its own behaviour as the battery fills, and it cannot present a fault on demand. The adapter repeats the same state exactly, including faults no owner should reproduce with a real vehicle.
Will the electrician open the charger?
The visit tests from outside — the circuit and the connector. The inside of a sealed charger is the manufacturer’s territory, and the measurements above are designed to reach a verdict without opening it.
My charger passed every test but still fails some nights. What then?
That is the “no fault found” verdict, and it is still useful: it clears circuit and charger under test conditions, so the hunt moves to conditions — time, load, temperature — with your pattern log as evidence. Intermittent faults are chased by records, not resets.
Related Reading
- How to Test an EV Charger
- Are Home EV Chargers Safe?
- Why Does My EV Charger Keep Tripping the Breaker?
- Why Is My Electric Car Charger Not Working? A Driver’s Checklist
