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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