Safe installation: Power and installation cables

⚠️ Important

  • 230 V is dangerous. A qualified electrician must install, join and connect cables in fixed wiring.
  • A cable’s permissible current depends on conductor cross-section, installation method, temperature and neighbouring cables.
  • Do not use cables with damaged insulation or unreadable markings. Select the circuit breaker to protect the cable; an RCD does not replace overload protection.

What to know before buying

List equipment power in W, rated current in A, route length and installation conditions: wall, conduit, thermal insulation, outdoors or underground. Motors and power supplies may draw starting currents above their operating current. The electrician selects conductor cross-section in mm² considering load, voltage drop and protective operation. Identical cross-sections do not have identical current capacities under different conditions.

Check conductor count, material and construction: solid or fine-stranded conductors, copper or aluminium require suitable terminals. Establish whether neutral N and protective conductor PE are needed; they are not interchangeable. The sheath must suit moisture, UV exposure and the installation method. Indoor cable is not automatically suitable for direct burial. Buildings also require consideration of cable reaction-to-fire classification. LBN 261-15 «Ēku iekšējā elektroinstalācija» provides general guidance.

What the electrician does

  1. Disconnects the circuit supply, prevents accidental reconnection and verifies absence of voltage with a suitable tester.
  2. Calculates load and voltage drop; selects cable, circuit breaker and necessary residual-current protection.
  3. Plans routing, accessible connections, mechanical protection and separation from data cables.
  4. Installs and secures the cable within the manufacturer’s bend-radius and pulling limits, without damaging its sheath.
  5. Makes connections in suitable enclosures using compatible terminals and ferrules where needed; follows tightening requirements.
  6. Checks PE continuity, insulation and protective operation; then energises, labels the circuit and provides measurement results.

What you can do yourself

Collect equipment specifications, photograph accessible markings and agree the route. Keep route photographs before finishing work. Cables have no app or network settings. After the electrician’s checks, use connected equipment and check normal operation without opening connection boxes or the distribution board.

Common mistakes

  • Selecting cross-section by equipment power alone, ignoring route length.
  • Ignoring reduced cooling in thermal insulation or tightly grouped cables.
  • Using an unsuitable sheath outdoors or underground.
  • Joining copper and aluminium with incompatible terminals.
  • Fitting a larger breaker to stop repeated trips without checking the cable.

When to disconnect power immediately

If you notice burning smells, melting, sparks or smoke, avoid touching damaged areas. Disconnect the affected circuit at the board if safe. Do not reconnect it, including after repeated protective trips; call an electrician. In a fire, move to safety and call 112.

See the manufacturer’s instructions for the exact wiring diagram (link on the product page). You can order installation from us.

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