On exceptional occasions, the power supply may be affected by unforeseen cuts. Supply interruptions are caused by incidents arising anywhere along the supply chain: at power stations, along the transport or distribution network or in the customer’s own installation.

To resolve any supply interruption as quickly as possible, we need to establish whether the fault has occurred in the customer’s or distributor’s installation.

  • Identify the components

    Power Control Switch (PCS)

    This is located next to the General Control Panel and Protective Box. It controls and limits the contracted power. If the sum of the power connected simultaneously exceeds the contracted amount this device will respond by leaving the particular installation without power.

    General Automatic Switch (GAS)

    This protects the house’s entire installation from overloads and short-circuits. It is a switch that has been added recently.

    Differential Switch (DS)

    This quickly protects and disconnects the electric installation where there is an earth fault, keeping people safe from harm.

    Small Automatic Switches (SASs)

    These protect against incidents caused by short-circuits and overloads in each of the internal circuits (lighting, heating, household appliances, etc.). The number of SCBs will depend on the extent of electrification or complexity of the electrical installation of the house or premises. 

  • Initial checks


    Once the components have been identified, any switch on the panel found down must be switched up.

    If no devices trip again, the problem is resolved.

    If, on the other hand, a device goes down again, continue with the checks.



    Disconnect and switch off all the switches: the General Switch (GAS), the Differential Switch (DS) and the SASs.

    Then, you must turn on the power control switch (PCS). If it still trips when everything is switched off, call 900 333 999.

    If the PCS does not trip, you must turn on the General Automatic Switch (GAS). If this trips it means there is a fault in some part of the installation, so you must call an authorised electrician.

    If the GAS does not trip, turn on the Differential Switch (DS). If this trips it means there is a fault in some part of the installation, so you must call an authorised electrician.

    If the DS does not trip, switch the Small Circuit-Breakers (SCBs) on, one by one. If one of the SAS trips it means there is a fault in the corresponding circuit, so you will need to call an authorised electrician.

    If none of the SAS trip, you can connect the receivers (light, electrical appliances, boiler, etc.) one by one until you locate the fault. If the SAS turns off when you connect the receiver appliance, this means the appliance is faulty and should be repaired.


    listaIf you are still unable to locate the fault, you must contact a private installer.

    Generally, when everything in the house is connected and the CPS trips, this is because the power demanded by the electrical appliances is greater than the amount of contracted power.

    One temporary solution to this problem is to disconnect some appliances to reduce the amount of power required, to prevent the PCS from tripping. In order to connect all appliances simultaneously, you must ask a supplier to increase the amount of contracted power you have.

  • How to respond

    A network supply interruption must be reported by calling 900 333 999, as soon as the following are detected:

    listaAn area without service.

    listaA building which is partially or totally without service.

    listaIncidents in electrical installations or any other hazardous situation.

    Whenever a fault is detected (through the company’s own systems or a customer communication), we take measures to restore the service as quickly as possible.

    Once the maintenance team reaches the site of the fault, they evaluate the problem and estimate the amount of time it will take to resolve. In fact, where the network’s configuration so allows, the service will be re-established via other substations, lines or transformer stations that are unaffected by the fault before the repair work gets under way, so customers will have a power supply once that work starts.

    In emergency situations caused by atmospheric conditions, our company works in co-ordination with the emergency services who put the appropriate protocols in place for each situation.

  • Tips

    If there is a blackout, it is recommended that you follow the tips below:

    listaIt is useful to have torches and replacement batteries to hand, to avoid having to use candles, thus reducing the risk of fire.

    listaDo not open the fridge or freezer, to conserve the cold and preserve the food.

    listaTo prevent appliances from being damaged when the service is resumed, it is useful to unplug them until the power comes back on.

    listaFor safety reasons, do not touch the electricity panel or operate any of its mechanisms with wet or damp hands.