Old ungrounded outlets from the 1960s and 70s are still found in hundreds of thousands of Swedish homes. With more and more home electronics — computers, chargers, media receivers — the risks increase rapidly. Here is everything you need to know about grounding ungrounded outlets.
What is an ungrounded outlet and why is it dangerous?
A grounded outlet (Schuko) has three contacts: phase, neutral, and protective ground (the round opening in the middle). The protective ground leads dangerous fault currents directly to ground if something goes wrong inside an appliance.
An ungrounded outlet (the old "child-friendly" outlet with two holes) completely lacks this third conductor.
What happens during an electrical fault without a ground? If the insulation fails inside a vacuum cleaner, toaster, or computer and the outlet is ungrounded, the appliance's entire metal casing can become live. You won't notice anything — until you touch the appliance and "close the circuit" through your body.
With a grounded outlet + residual-current device (RCD): the current is carried away and the RCD trips within 30 milliseconds. No harm done.
Risks with Ungrounded Outlets in 2026
| Risk | Ungrounded outlet | Grounded outlet + RCD |
|---|---|---|
| Electric shock upon cable break | ⚠️ Dangerous — no safety switches | ✅ RCD trips |
| Damage to electronics | ⚠️ Static discharges damage sensitive electronics | ✅ Static electricity is led to ground |
| Fire risk | ⚠️ Leakage current can cause overheating | ✅ Fault current is safely led away |
| Modern appliances | ⚠️ Peripherals cannot be connected correctly | ✅ Works correctly |
The Electrical Safety Board's Rules: When MUST you ground?
Existing ungrounded outlets in an unchanged installation are not an immediate regulatory requirement to fix — so you are not forced to ground the whole house if you do nothing. But you must ground when:
- Renovating rooms with water (kitchen, bathroom, laundry room) — always a requirement
- Changing to tiles or other conductive surface coatings
- Installing underfloor heating, EV chargers, or similar
- If you have confirmed an electrical fault or the RCD trips due to leakage current
Important: You may not mix grounded and ungrounded outlets in the same room. Either the whole room is grounded, or none of it.
What does it cost to ground outlets?
The cost depends on whether the existing empty conduit can be used to fish in the new yellow-green protective conductor, or if new cable trays must be routed.
| Action | Price (gross) | With ROT (-30%) |
|---|---|---|
| Ground 1 room with existing conduit (3–4 outlets) | 4,000–7,000 SEK | 3,000–5,300 SEK |
| Ground 1 room without conduit (new cable tray) | 7,000–12,000 SEK | 5,300–9,000 SEK |
| The whole villa (6–8 rooms) rewiring | 35,000–75,000 SEK | 26,000–57,000 SEK |
| Per outlet (included in the group above) | 800–1,500 SEK | 600–1,100 SEK |
The ROT deduction gives a 30% discount on the electrical installer's labor cost.
Step-by-Step: This is how grounding is done
- Inspection — The electrician checks the existing conduits with fish tape or an endoscope
- Cable fishing — The yellow-green protective conductor is fished into the pipes from the electrical panel
- Boxes are opened — All outlets and lamp junction boxes in the room are opened
- Protective conductor connected — The ground screw in each box is connected to the new conductor
- Grounded outlet mounted — Old oval outlets are replaced with modern Schuko outlets
- Control measurement — Continuity and insulation resistance are measured and documented
Frequently Asked Questions about Grounding Outlets
Can I just change the outlet to a grounded one without running a new cable? No. You cannot "create" ground by changing the plastic cover. Without the protective conductor in the box, a grounded outlet without a ground cable is directly dangerous — the appliance is still unprotected, and you get a false sense of security.
What is a "false ground" (3-pin adapter)? An adapter that turns a 2-pin plug into a 3-pin without an actual ground connection is life-threatening. It is sometimes used with plug adapters. Never use these.
Is an RCD sufficient instead of grounding? A residual-current device (RCD) protects against dangerous leakage currents, but does not replace the protective ground in the outlets. They complement each other and should be present together in a modern installation.
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We inspect the conduits, fish in the protective conductor, and install modern Schuko outlets throughout the home — with a warranty and ROT deduction. Contact us for a free price quote.
