Facilities Electrical Systems 1 PE3120Due _______________Test #2 _____________ ASSIGNMENT #81....

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Facilities Electrical Systems 1    PE3120Due _______________Test #2 _____________ ASSIGNMENT #81. Define the following:a) Overcuent b) overload  c)short circuit d)dead (bolted) short (fault) e) arcing fault   f) circuit eaker g)fuse h) inverse time characteristics i) instantaneous time characteristics j) trip free k)solid material power fuse 2. What are functions of overcuent protection?3. What are the overcuent protection ratings?4. Describe the basic operation of a fuse?5. What is a cuent limiting fuse and its purpose?6. What is a duel element fuse and it’s purpose?7. What is a renewable fuse and how does it work?8. What is a fusible switch, the purpose and ratings?9. What is meant by coordinating fuses?10. Draw an inverse time fuse characteristic curve and label (describe).11. With reference to arcing, describe inteupting action of eakers? Include reducing arcing, etc.12.  Describe three types of low voltage circuit eakers.13. What has made possible cuent limiting eakers?14. What is the I2t value of a fuse?15. What is the standard fuse rating and cartridge size for a circuit that has a maximum ampacity of 72A? What is the clearing times at 133% and 200% rating?16. What is the purpose of using arcing contacts on circuit eakers? How do they accomplish this purpose?17. Draw a time cuent characteristic for a molded circuit eaker and label.18. What is the molded case circuit eaker frame size for 600V, 280A rating? What is the inteupting ratings for STD and HIC?

Kshitij · Accepted Answer

Ans1.
Overcurrent-
Overcurrent or excess current may be a scenario wherever a bigger than meant electrical phenomenon exists through a conductor, resulting in excessive generation of warmth, and also the risk of fireside or damage to instruments.
Overload-
An electrical overload happens once an excessive amount of current passes through electric wires. The wires heat and might soften, with the chance of beginning a fireplace.
short circuit-
A short circuit is solely a low resistance connections between the 2 conductors supply power to any circuit. This leads to excessive current flow within the power supply through the 'short,' and will even cause the ability supply to be destroyed.
Dead short-
A dead short occurs when electric circuit has zero resistance. this could result from the "hot" electrical feed coming back in-tuned with a metal object, sort of a metal receptacle or with the bottom or neutral wire. Your initial sign that you simply might have a dead short are going to be a tripped breaker.
Arcing fault-
An arcing fault is that the flow of current through the air between section conductors or section conductors and neutral or ground.
Circuit Breaker
A circuit breaker is a device that  senses interrupts the abnormalities or fault current. it's a machine that disturbs the flow of high magnitude (fault) current and in additions it  performance is like a switch.
Fuse-
Fuse is an electrical device works when its senses overload in circuit, it can stop current from flowing.
Trip free
Free to trip on the incidence of any condition (as an overload) that provision is created although the traditional operational lever or the control-switch closing contact is control within the closed position a trip-free breaker.
Solid material fuse
The solid-material power fuses  are required when the limits of the fused cutouts and fuse links have been exceeded due to higher fault currents or higher loads
2.

Facilities Electrical Systems 1 PE3120 Due ___ Test #2 _ ASSIGNMENT #8 1. Define the following: a) Overcurrent b) overload c)short circuit d)dead (bolted) short (fault) e)...

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Facilities Electrical Systems 1 PE3120 Due _______________ Test #2 _____________ ASSIGNMENT #8 1. Define the following: a) Overcurrent b) overload c)short circuit d)dead (bolted) short (fault) e)...

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Facilities Electrical Systems 1 PE3120 Due ___ Test #2 _ ASSIGNMENT #8 1. Define the following: a) Overcurrent b) overload c)short circuit d)dead (bolted) short (fault) e)...