This book is not written for the first
year apprentice. This is an excellent book for the final year
apprentice, contractor, designer and inspector. when this book is used
for classroom instructions, the instructor must first teach the
formulas and variable
from this book.
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Perhaps electrical design is not why you got into this
business, but it has been said that 70% of all electrical designing is
done by the electrician.
While the electrical designers are busy
designing the large buildings, the electrician is called upon to wire
the new piece of equipment just purchased, correct Code violations, or
to give a bid for an add-on, or install a larger service to an existing
building, etc. |
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Remember, conductors are not intelligent. They don't know where they
are going to be installed (in the basement, attic, soil, free air).
They do not know the environment where they have been placed (wet, dry,
hot, cold). They do not know how crowded it will be in the conduit or
how many conductors beside them will be carrying current. They do not
know how far they will be run or how long and hard they will have to
work. They do not know if they will be properly protected and
insulated from heat and moisture. Conductors aren't very smart.
Designing motor circuits are rather complicated so first we need to
understand how a motor functions. A motor doesn't have any
intelligence, it will actually work itself to death if we don't protect
it. A properly protected motor will last many years.
One must
first apply the variables
to the load to properly install the conductors.
This book contains Chapters: •The Electrical Conductor, •Resistance,
•Insulation, •Temperature Rating of Devices, •Type of Load, •Motors,
•Article 300 Wiring Methods.
Except for mechanical abuse, the greatest hazard that conductors must
endure is heat.
Conductor insulation can be damaged by excessive heat in various ways,
depending on the type of insualtion and the degree of overheating.
24 Exams - Over 300 Questions
with detailed answers from these chapters.