A lost neutral is a break in the neutral conductor of your supply, at the service connection or inside your installation.
Key Takeaways
- A lost neutral unbalances the supply: some circuits get too little voltage, others get too much — the high side damages electronics.
- Uneven lights, devices failing together and a charger refusing to run are the signs.
- It is a supply fault, not a charger fault: stop charging, report it to the supplier, and have your side tested by an electrician.
- Do not resume charging until the supply and the charger have both been checked.
With the neutral gone, the voltage stops being shared evenly between your circuits: some receive too little, others receive too much — and it is the “too much” that damages electronics, chargers included. It is a supply fault, not a charger fault. Stop charging, and have the supply itself checked by your electricity supplier and a licensed electrician before anything is plugged back in.
How the Voltages Go Wrong
Most homes are fed by a supply whose two halves share one neutral, which holds both sides at their proper voltage. Break the neutral — a corroded service connection, a failed joint, storm damage — and the two sides are left connected to each other instead. The voltage then divides between them according to whatever happens to be switched on: the lightly loaded side’s voltage climbs, the heavily loaded side’s falls, and switching on a kettle shifts the balance again. Nothing inside the house caused it, and nothing inside the house can correct it.
The Signs Around the Home
- Lights behaving oddly — some rooms unusually bright, others dim, changing when big appliances start or stop.
- Several devices failing together — electronics are the first casualties of the high side.
- A charger that refuses to start, or stops with a fault — many chargers watch the supply and shut down outside its limits: protection working, not a broken charger.
- Any burning smell at the panel or meter — stop, switch off at the main switch if you can do so safely, and treat it as urgent.
Do not confuse this with a brownout, where the grid delivers low voltage to a whole area. A lost neutral is local to your service, and its danger runs the other way:
| Brownout | Lost neutral | |
|---|---|---|
| Where it sits | The grid, affecting a neighbourhood | Your service connection or installation |
| What voltages do | Everything runs low together | Some circuits low, others dangerously high |
| Who fixes it | The supplier, when the grid recovers | The supplier on their side, your electrician on yours |
What to Do, and What Not to Do
- Stop charging and unplug sensitive electronics on the affected circuits.
- Report it as a supply fault — your supplier’s fault line first; a break on their side of the meter is theirs to repair.
- Have your side tested too — a licensed electrician checks the installation, including the charger’s circuit.
- Do not open the panel or touch service wiring. Diagnosing a neutral fault is test-equipment work for the supplier and the electrician.
Where an EV Charger Fits In
A charger is one of the largest loads in the home, and it runs for hours: EV charging is treated as a continuous load, which is why a 48 A charger belongs on a 60 A breaker. Two consequences follow. A marginal neutral connection that survived years of small loads can finally fail under a charger’s long, heavy draw — the charger is the trigger, not the cause. And the charger is expensive electronics on that circuit, so the post-fault inspection should include it. Correct protection still matters on healthy days — our guides to RCD protection and GFCI protection cover that layer. Once the supply is tested and cleared, a listed unit such as the EVDANCE EV-ACT5006T 48A Level 2 wall charger (ETL, FCC and CE listed) goes back to work.
Frequently Asked Questions
Can a lost neutral damage my EV or its charger?
The risk is to whatever is connected while the voltages are wrong, and the charger — plugged in for hours — is the most exposed item in the house. Have the charger and its circuit inspected after the repair, and let the car’s maker or a dealer check the car if it was charging at the time.
My charger stopped and showed a fault. Is the charger broken?
Not necessarily — stopping is what a charger should do when the supply leaves its limits. Note the fault, check for the other signs above, and have the supply tested before replacing the unit.
Who pays for the repair?
It follows the fault: a failed connection on the supplier’s side of the meter is the supplier’s repair; a failure inside your own installation is yours, through your electrician. Report first and let the testing place the break.
Related Reading
- RCD Protection for EV Chargers: Type A, Type B and 6 mA DC Detection Explained
- Does an EV Charger Need GFCI Protection?
- What Size EV Charger Can I Have at Home? Panel Capacity Explained
- Are Home EV Chargers Safe?
