How Do You Set Up a Grounding Sheet?

Put the conductive sheet on top of the mattress with nothing between it and you, plug its cord into an earthed outlet, and confirm the connection with a tester. The one rule that governs every other decision is simple: the conductive surface has to touch skin. Anything insulating that sits between the two — a mattress protector, a thick cotton sheet, pyjamas over the whole contact area — works against the connection.

Does the grounding sheet go over or under the fitted sheet?

Over. A fitted grounding sheet goes directly onto the mattress and you sleep on it, the same way you would any fitted sheet. A grounding flat sheet or half sheet lies on top of your ordinary fitted sheet. In both cases the conductive fabric is the layer your skin meets.

If you prefer a normal sheet next to you for comfort, a half sheet is usually the better answer than layering: it covers the torso area, leaving the rest of the bed as it was.

What comes in the box?

A fitted grounding sheet ships as a kit: 1 × fitted sheet, 1 × 4.6 m (15 ft) cord and 1 × earth adapter. The cord carries the built-in ≈91 kΩ ±1% current-limiting safety resistor. The plug supplied is EU (Type F); Type G, Type A/B and Type I plugs are sold separately, so check which one your outlets take before you start.

What can sit between you and the sheet?

The connection is made through contact, so the question for any layer is simply whether it conducts. Cotton and linen hold some moisture and conduct weakly, so a thin natural-fibre layer reduces the contact rather than removing it. Polyester, acrylic and most waterproof backings are insulators and effectively break it. A thick layer of anything, natural or not, does the same.

That is why the order matters more than the materials: protectors and toppers go under the conductive fabric, and the fabric goes against skin.

Can I use it with a mattress protector or topper?

Yes, underneath it. A protector or topper goes on the mattress first, then the grounding sheet on top of it. What does not work is the reverse — a waterproof or quilted protector laid over the conductive fabric puts an insulating layer exactly where the contact needs to happen.

A memory-foam or latex topper makes no difference to the connection as long as it is below the grounding sheet, because the path runs through your skin and the cord, not through the mattress.

Where does the cord go?

1. Attach the cord's press-stud to the sheet's connector tab.
2. Run the cord off the side of the bed nearest the outlet you plan to use, tucking it under the mattress edge so it is not walked on.
3. Plug the other end into the earth contact of a wall outlet, using the adapter for your plug type.
4. Leave enough slack that the cord is not pulled taut when you move in the night.

Our cords carry a built-in ≈91 kΩ ±1% current-limiting safety resistor. The connection is made to the earth contact only — not to live or neutral.

How do I know the outlet is actually earthed?

Test it. An outlet with an earth pin is not necessarily connected to earth, and the grounding connection depends entirely on that. See how to test that a wall socket is earthed, or go straight to the socket testers.

If no outlet in the room has a working earth, a ground rod outside with the cord run in through a window is the alternative.

How do I check the sheet itself is connected?

Use the Grounding Tester Pen. It reads whether the fabric conducts between the two copper pins in its tip, which answers a different question from the socket tester: not "is the outlet earthed" but "does the fabric still conduct where I touch it". Press both pins of the pen flat against the conductive surface and read the indicator.

Still have a question? Read the FAQ