Week #8: (10/21) Electrical Protection devices.

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rjagodowski
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Joined: Fri Sep 04, 2015 6:59 pm

Week #8: (10/21) Electrical Protection devices.

Post by rjagodowski »

For part of today's lecture, we will revisit the topic of GFCI's for electrical protection. There were a few links posted in Week #7. We'll add a few more.

Ground Fault Circuit Interrupters:


GFCI's can be found on pages 37, 450 & 451 in Chapter 23 in the text.


How GFCI's Work from ECMWeb.com. Here it is in pdf, a printout of which will be provided for you on Monday, 10/21.
How GFCIs Work_from ECMWeb.pdf
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Ground Fault Circuit Interrupters from SafeElectricity.org. There is a video on this link from a family who lost their daughter to an electrical accident which could've been prevented with a properly functioning GFCI. Safety, and in this case Electrical Safety, is NOT just something which should be practiced in the workplace, but in every day living as well.


Fuses & Circuit Breakers:


Content on Fuses and Circuit Breakers can be found in the text on pages 447-451. Answer Review Questions 13-17 on Page 460.

Here's a quick video on How a Fuse Works (00:40)

Surger Protectors & Fuses

Attached below is a Trip Time graph for a common series of GE Circuit Breakers. Note how the graphs are "normalized" so they apply to the entire family of breakers regardless of their trip value (15A, 20A, etc.). Also notice that this graph is a "Full Log" plot. That is, BOTH the vertical and horizontal scales are logarithmic. For these plots, that means that an equal distance corresponds to a factor of 10. A "linear" scale is one in which an equal distance corresponds to a factor of 1. Log scales are used to present a wide range of values over a concisely presentable graph.
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