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TNB your safety guide

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									Your Safety
Safety Do's and Don'ts
       Use high quality electrical appliances and certified with SIRIM
       Make sure that all sources of power main switch is turned off when leaving home for a long period
        of time
       If an Earth Leakage Circuit Breaker (ELCB) trips when you try to switch it back on, there is a
        possibility of equipment or installation damage at your home. Appoint a registered contractor for
        further inspection
       Do not use obsolete or broken electrical appliances
       Do not use electrical appliances that have been exposed to water
       Do not touch any live wire
       Do not expose wiring to heat, vapor and pressure
       Avoid installing sockets near water source
       Do not fix extra wiring yourselves. Instead, hire a qualified contractor to do so
       Do not overburden an extension cord with too many types of electrical equipment
       Do not connect too many appliances from one power source. Avoid using a socket connector that is
        not approved
       Stay away from fallen electrical poles or power lines




ELCB


Types of Earth Leakage Circuit Breaker (ELCB)




Installation of ELCB

Image below depicts the installation of a typical ELCB on your main switchboard
    1.   Plastic board
    2.   Main switch
    3.   Circuit breaker
    4.   Miniature Current Circuit Breaker (MCCB)




Your home electricity supply is cut off if the ELCBindicator trips from 1 to 0



Causes for Circuit Breaker Trip

    1.   Lighting
    2.   Broken electrical appliances
    3.   Faulty wiring


How to Handle ELCB


                                  1. ELCB trip and indicate 0




                                  2. Off main switch




                                  3. Off all home switches and remove the socket plug




                                  4. Turn on ELCB from 0 to 1




                                  5. Switch on main switch
                                  6. Switch on your home switches one by one. If ELCB trips again, your
                                  wiring could be faulty. Appoint a registered contractor for further
                                  inspection




Caution:


       Make sure your hands are dry when handling ELCB
       Cover your feet with shoes or rubber slippers




Electric & Magnetic Fields (EMF)




What is EMF?

Electric and magnetic fields (EMF) are present everywhere in our environment but are invisible to the human
eye.
Earth is a natural source of EMF; lightning is a product of electric field build-up during thunderstorm,
compass           needle         is         oriented        by         earth        magnetic            field.
Electricity, microwaves and radiofrequency fields are man-made sources of EMFs that form a major part of
our modern life. Power frequency (50Hz in Malaysia) EMF is associated with electrical apparatus including
power lines, underground cables and home appliances.




How do these fields behave?

Electric Fields

Electric fields are created by voltage. The higher the voltage, the stronger the electric fields. You will find an
electric field near any electrical appliance that is plugged in, even if it is not operating. Electric fields are
strongest closest to their source.


Magnetic Fields

Magnetic fields are created by current or electricity flowing through a wire. Magnetic field strength increases
with current, so you will find a stronger magnetic field near an appliance when it runs on “high” than when it
runs on “low.” An appliance must be plugged in and operating to create a magnetic field. Magnetic fields are
also                strongest                close                to               their                source.

The following table provides comparison between electric and magnetic fields.
Electric Fields                          Magnetic Fields

Produced by voltage (pressure            Produced by current flow (when
which forces electricity along wires).   the apparatus is switched on)

Measured in volts per meter (V/m)        Measured in gauss (G) or Tesla
or in kilovolts per meter (kV/m).        (T).

Easily shielded (weakened) by
                                         Not easily shielded (weakened)
conducting objects such as trees
                                         by most material.
and building.

                                         Strength decreases rapidly with
Strength decreases rapidly with
                                         increasing distance from the
increasing distance from the source.
                                         source.


How are we exposed to power frequency EMF?

Everyday, we are exposed to the magnetic field at home, office or in an industrial environment. This is
because of our close contact with the electrical appliances and machinery around us. And since these
machinery draw a large amount of current when they operate, they do produce some level of magnetic field.


Does this affect us?

Studies and researches conducted internationally by expert and recognized agencies over the years have
shown no firm evidence of a link between EMF from power lines or other power supply installations and any
acute or long-term effect on human health.


What is TNB doing to further reduce EMF emission?

We     are      taking       all         necessary     measures       to   reduce    EMF       emission.
Amongst the steps taken are:

    1.   Designing and configuring power lines and substations that minimize EMF emission.
    2.   Providing extra precautionary measure by maintaining wider clearance than the statutory
         requirement.
    3.   Complying with EMF regulations, guidelines or best practices recognized by international bodies.
    4.   Prohibit development directly beneath TNB lines and within their right-of-way to ensure safety
         clearances.
    5.   Review and update scientific findings on EMF across the world and continue to reassess any
         implications for the way in which we operate.
Electrical Safety Guidelines During Flooding
Tenaga Nasional Berhad (TNB) urges the public to observe the following safety guidelines in the event of
flooding.


Electrical Equipment




                                Be careful when using electrical appliances when the water level is rising in
your home.

If you are instructed to move to a temporary evacuation center, make sure the main switch is off.


        Do not touch any electrical appliances or switches with wet hands
        Make sure appliances which are submerged in flood water are inspected and tested by certified
         electrical contractors before reuse


TNB Installation

Always keep an eye on your children to not come close to a fallen power lines or broken electrical wires.




                               If there is any broken electric wire or fallen power lines, do not try to repair
the damage yourself. Instead, contact the nearest TNB Office or immediately call our TNB Careline at 15454.

In order to avoid possible electric shock, stay away from areas where water levels rise and might reach TNB
wires. Report the matter to any TNB offices at once.




Do not come close to any electric wires

When there is heavy rain or flooding, electrical wires and poles will be exposed to hazards such as fallen




trees. If this occurs:


        Do not approach broken electric wires on the ground because the wire might still have electricity
        Do not try to remove broken electrical wires by hand or any other electric conductor
        Do not come near any potholes which might have live broken wires as water can conduct electricity
Our Action




                                       TNB will continuously monitor the flood situation from time to time.

If the water reaches a dangerous level, TNB will temporarily shut down the electricity supply to nearby
substations in order to ensure public safety.

Electricity supply will be restored once the flooding has subsided.

								
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