by: Julie Ann V. Tolentino
Jemimah Jireh O. Adorable
6. This excessive current load can be a result of electrical insulation failure ( a short circuit) or human error. A correctly designed electrical system incorporates suitable overload protection devices to prevent damage should such a situation occur. Fuses and circuit breakers are most commonly employed for this purpose.
7. A short circuit- occurs when conductors of opposite polarity are accidentally bridged by a conductive object or bridged to grounded metal. Metal screwdrivers, wrenches, fish tapes, test instruments, etc. have all been found to have made inadvertent contact while persons were working on live equipment. An arcing fault may be established that is limited only by the total impedance of the circuit. The arcing will continue until circuit breaker, fuse, or equipment ground fault protection device on the line side of the fault opens the circuit. Even if the short circuit protective device opens the circuit without any intentional delay, portions of the conductors and other metallic materials in the path of the arc may explode violently, showering the area with hot molten metal that can cause severe burns or death. The flash associated with the arc can also cause permanent eye damage. Finally, a short circuit may expel shrapnel toward the workman, penetrating clothing or the body.
Overload- leading to excessive heating of the wires and a possibility of fire. This excessive current load can be a result of electrical insulation failure ( a short circuit) or human error.
Sunday, December 9, 2007
by:JuLie ann V. Tolentino
Jemimah Jireh O. Adorable
1. short circuit- allows a charge to flow along a different path from the one intended.In electrical devices, unintentional short circuits are usually caused when a wire's insulation breaks down, or when another conducting material is introduced, allowing charge to flow along a different path than the one intended.
2. fuse- an electrical device with low melting temperature used to protect electrical appliances from the effect of excessive current when we blow the fuse:The maximum currernt which a fuse can carry without "blowing off" is indicated in the fuse.A blown-off fuse must be changed when the switch is open.In case of emergency,the line can be completed by bridging the gap with ordinary wire,but this wire must be replaced as soon as possible by the proper-sized fuse.
3. circuit breakers- is an absolutely essential device in the modern world, and one of the most important safety mechanisms in your home. Whenever electrical wiring in a building has too much current flowing through it, these simple machines cut the power until somebody can fix the problem.
4. there is an overload in the circuit if:
Electrical overload is a situation where the wiring to or within a machine or system is subjected to a greater electric current load than it was designed to carry, leading to excessive heating of the wires and a possibility of fire. This excessive current load can be a result of electrical insulation failure ( a short circuit) or human error. A correctly designed electrical system incorporates suitable overload protection devices to prevent damage should such a situation occur. Fuses and circuit breakers are most commonly employed for this purpose.
Jemimah Jireh O. Adorable
1. short circuit- allows a charge to flow along a different path from the one intended.In electrical devices, unintentional short circuits are usually caused when a wire's insulation breaks down, or when another conducting material is introduced, allowing charge to flow along a different path than the one intended.
2. fuse- an electrical device with low melting temperature used to protect electrical appliances from the effect of excessive current when we blow the fuse:The maximum currernt which a fuse can carry without "blowing off" is indicated in the fuse.A blown-off fuse must be changed when the switch is open.In case of emergency,the line can be completed by bridging the gap with ordinary wire,but this wire must be replaced as soon as possible by the proper-sized fuse.
3. circuit breakers- is an absolutely essential device in the modern world, and one of the most important safety mechanisms in your home. Whenever electrical wiring in a building has too much current flowing through it, these simple machines cut the power until somebody can fix the problem.
4. there is an overload in the circuit if:
Electrical overload is a situation where the wiring to or within a machine or system is subjected to a greater electric current load than it was designed to carry, leading to excessive heating of the wires and a possibility of fire. This excessive current load can be a result of electrical insulation failure ( a short circuit) or human error. A correctly designed electrical system incorporates suitable overload protection devices to prevent damage should such a situation occur. Fuses and circuit breakers are most commonly employed for this purpose.
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