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—Wiring and circuits

After drilling into a hidden cable

Hitting a cable while drilling or fixing something to a wall happens. What matters is what happens next.

Cables run in walls, often vertically above and below sockets and switches and horizontally near ceilings, though older or altered homes may not follow any pattern. Drilling or nailing into one can cause a flash, a trip, or nothing visible at all — a partly damaged cable may continue working and overheat later.

Wiring guides explain how circuits are put together and changed, so a quotation or a recommendation is easier to follow.

If you suspect you have hit a cable, stop, leave the drill or nail where it is if it is safe to do so, and switch off the circuit at the board — or the main switch if unsure. Do not tape over the damage or plaster over it. The cable needs a proper repair or replacement and the circuit tested before use.

01In short

The points that matter most

  • Switch off first

    Before removing anything.

  • No tape repairs

    Damaged cable needs proper repair.

  • Test before use

    Hidden damage can cause later faults.

02Detail

How it is repaired

  • Locating the damage

    Opening the wall around the hit.

  • Repair or replace

    Using suitable connectors or replacing the section.

  • Testing

    Insulation and continuity tests before reconnection.

03Checklist

To avoid it next time

  • Avoid zones near sockets

    Cables often run above and below them.

  • Use a detector

    Helpful but not infallible.

  • Ask before drilling

    Especially in altered homes.

04Questions

Questions people ask

Nothing happened. Is it fine?
Not necessarily; partial damage can overheat later. Have it checked.
Can I repair it with a connector myself?
Cable repairs should be made by a qualified person and tested.
Will the wall need opening?
Usually a small opening to reach the damaged section.

05Related

Related guides

This guide sits under electrical wiring. All topics are on the guides page.

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Hit a cable?

With the circuit off, tell us where it happened. We will arrange repair and testing.

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