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Handle Supply Interruptions

When supply interruption occurs, identifying the situation and finding the right handling method can help restore the supply with shorter time. Here we will go through three common conditions of supply interruption and their handling methods:

Whole Building has lost supply

First, check if supply is available to the rest of your building.

If the whole building has lost supply, please call our Customer Emergency Services Centre at 2555 4000.

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If only your floor or part of your building has lost supply

The interruption may be caused by the problem of the building's communal electrical installation.

You can call your management office for investigation.

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If only your flat has lost supply

Check the miniature circuit breaker (MCB) and/or the residual current device (RCD) in the electrical distribution board.

If it has tripped, the interruption may have been caused by the defective appliances, defective wiring or overloading.

Identify and isolate the defective appliance or circuit that caused tripping.

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Then try to reset the MCB or RCD to "ON" position to restore supply.

If the MCB or RCD cannot be reset to "ON" position, call a registered electrical worker to check and repair.

Do not attempt to repair faulty equipment or carry out any work on the wiring by yourself.

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Click this link to view the sign language video about "Handle Supply Interruptions".

In addition, below are some smart tips for Management Offices, Incorporated Owners and customers in preparing planned power suspensions:

Smart Tips for Handling Planned Power Suspensions

Planned power suspensions are sometimes required to facilitate routine maintenance or upgrading of existing fixed electrical installations, it is advisable to make suitable preparation for the planned power suspensions to avoid the possible undesirable outcomes below:

  • People being trapped in lifts/tripped on escalators
  • Vehicles being trapped in car park buildings
  • Suspension of essential electrical / medical equipment or related building services systems
  • Running out of fuel for standby generators or other backup supply units
  • Data loss in computer systems
  • Unexpected production loss / business interruptions
  • Loss of refrigeration to perishable food in refrigerator
  • Loss of air supply to fish in tanks
  • Mal-operation of security and / or fire protection systems
  • Breakdown of electrical appliances sensitive to voltage surges

Below are some general tips to Management Offices, Incorporated Owners and customers in preparing planned power suspensions:

1. General Tips for Management Offices / Incorporated Owners

  • Confirm the areas / services that will be affected by the planned shutdown with your own Registered Electrical Worker (REW) / Registered Electrical Contractor (REC) and notify the affected tenants in advance accordingly.
  • Contact service providers for lifts / escalators, telecommunication system, security system and fire protection system for necessary precautions for their systems during and after power suspensions.
  • Review/prepare the necessary contingency plans and procedures in case of emergency during power suspensions.
  • Arrange an alternative power supply, e.g. a standby generator, with sufficient capacity, ensure it is in order and equipped with sufficient fuel for supplying essential loads during the shutdown period.
  • Deploy an REW on-site to operate the electrical system/equipment before power suspensions and after restoration of supply if necessary.

2. General Tips for Non-Residential Customers

  • Contact service providers for lifts / escalators, telecommunication system, security system and fire protection system for necessary precautions for their systems during and after power suspensions.
  • Prepare a checklist of equipment required to be switched off before power suspensions and reset after restoration of supply respectively.
  • Check the capacity of Uninterruptible Power Supply (UPS) system, if equipped, and ensure the UPS is able to supply the connected loads for the whole power suspension period. Carry out maintenance or functional check of UPS system to make sure it is operational before the planned shutdown.
  • Back up important computer data to prevent data loss before the planned shutdown.
  • Deploy an REW on-site to operate the electrical system / equipment before power suspension and after restoration of supply if necessary.
  • If supply to refrigerators is affected, avoid opening the refrigerator doors frequently so as to minimize temperature changes inside the refrigerators. If possible, transfer the contents of the refrigerator, in particular perishable food, to unaffected refrigerators.
  • For critical equipment in restaurants and pet shops, such as air pumps, arrange a UPS system or battery-operated equipment as appropriate, to ensure normal operation of these equipment items during the shutdown period.

3. General Tips for Residential Customers

  • Switch off electrical appliances / equipment especially those sensitive to voltage surges before the planned power suspension. Make reference to equipment user guide / manual for proper shutdown and startup procedures.
  • Keep the doors of refrigerators/freezers closed as far as practicable to minimize temperature changes inside refrigerators. Transfer perishable items to other unaffected refrigerators if possible or procure necessary freezing agent(s), such as dry ice, to maintain the temperature of the refrigerator during the suspension period.
  • Transfer patients who have to rely on life-supporting equipment to hospital as appropriate before the power suspension.
  • Make a torch readily available and avoid using candles for temporary lighting.

Disclaimer

The contents are general guidelines only. In case of doubt, you should seek advice from the appropriate equipment manufacturers or a professional engineer. The Hongkong Electric Co., Ltd. shall not be liable for any losses or damages suffered by any persons howsoever arising from or in reliance upon the whole or part of the contents of this website.

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