Transcription of Topic 8 electrical safety - lntebg.com
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Topic 8 electrical safety - lntebg.com
electrical SAFETYSAFE & SUREL&T SWITCHGEARE lectricity is good servant but bad master. It can prove to be very dangerous if circuits are not properly protected. The major fault that appears in electrical network or equipment is termed as short circuit. In short circuit, the supply phase and neutral or earth is short circuited accidentally due to foreign metallic substance coming in contact with phase & neutral or earth or due to overload thereby damaging the insulation resulting in short circuit directly connected resulting in heavy current flow called "short circuit current".This high current heats up the terminations, switches, plugs & cable due to which temperature rises to such a high degree that it is sufficient to generate sparking which further leads to OF CIRCUITS :In order to restrict the short circuit currents and also off or isolate the faulty circuit from electric supply so that high short circuit current is interrupted before fire starts, appropriate protective devices need to be used as given below :Rewirable Fuses : It is strongly r
1. All voltages shall be considered dangerous even though voltage may not be high enough to produce severe shock (80V onwards). 2. All electrical circuits are to be treated as live and no work i.e. maintenance
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