Why is there continuity between my neutral and earth when nothing is plugged in?

Question

Accepted Answer

Continuity between neutral and earth with nothing plugged in is normal in most UK installations. At the main distribution board, the neutral and earth conductors are bonded together at a single point called the main earthing terminal. This is required by BS 7671. If you are measuring low resistance rather than a dead short, this is almost certainly that intentional connection. However, if readings appear on a socket circuit with the board isolated, investigate further or call a qualified electrician. If you have tested between the neutral and earth pins of a socket and found continuity, your first reaction might be that something is wrong. In most cases, it is completely normal and here is why.

In every UK home, the electricity supplier bonds the neutral and earth conductors together at the origin of the installation, usually at your main consumer unit or fuse board. This is called the neutral-earth bond or PEN conductor link. Because of this connection, any test you carry out between neutral and earth at any socket in the house will show continuity. Your meter is simply detecting that joined connection at the board, tracing back through the wiring.

What you might safely check yourself:

1. Make sure nothing is actually plugged in when you test, because appliances can create a false reading between neutral and earth through their own internal wiring.
2. Note whether the reading is a very low resistance, a few ohms or less, which points to the normal neutral-earth bond at the board.
3. Check whether the reading only appears on one circuit or every circuit, as a fault isolated to one circuit is more concerning than a reading across the whole installation.

When you should be concerned:

If continuity appears only on one specific circuit and not others, or if you can isolate the consumer unit and the reading disappears on some circuits but not all, there may be a neutral-earth fault somewhere in the wiring, such as a pinched cable, a loose terminal creating a bridge, or an incorrectly wired accessory.

You should also be concerned if you notice flickering lights, RCD tripping for no obvious reason, or any tingling sensation from appliances. These symptoms alongside a neutral-earth reading suggest a real wiring fault.

When to call an electrician:

If you are at all unsure, call a Part P registered electrician. They can carry out proper insulation resistance tests and loop impedance tests to confirm whether your installation is safe. Do not carry out any work inside your consumer unit yourself.