18. Electrical equipment

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18. ELECTRICAL EQUIPMENT 18. Electrical equipment Incorrect use of electrical equipment or defects in the equipment may cause overheating and start a fire. At shipyards, the most typical reasons for fires caused by electrical equipment are mentioned in the following list: equipment incorrectly earthed faulty cables fuses that have the wrong capacity hot arc and sparks placing the welding handle during the break in such a way that wire feeding starts unintentionally leading to overheating of wire an electrode left in the holder during the break with the power switched on loose cable connections An electric shock is always dangerous. The severity of the electric shock to someone depends on the amount of current flowing through the body, or body part, and its pathway through the body. The electric shock can cause: Injuries to the body (e.g. burns, muscle injury) Disorders in the vital function of the body (heart) Indirect accidents, such as falls resulting from being frightened by an electric shock or arc. There is always risk of electrical accidents if defective equipment is being used. Check the condition of the equipment and its suitability for the work. Safety Extra Low Voltage (Protective Extra Low Voltage) When the voltage is low enough, even dry skin can deter its flow through the body in case of contact. Therefore, for safety reasons a low voltage (less than 50 V AC or les than 120 DC) is often used. This voltage is called protective extra low voltage (PELV) or safety extra low voltage (SELV). In confined conductive spaces it is necessary to use electrical equipment with PELV. Protective insulation Protective insulations impede any direct contact of current with the exposed parts of the equipment, even when the actual operational insulation fails. 87


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