|
|
|
Creating A Bath Paradise
How To Turn Your Bath Into A Spa
The public bath played a very important social role in Ancient Rome. Women weren't permitted to use these public baths. It was a place were men often met in the afternoon. The public bath served more that a...
Finishing your Basement Can be Very Rewarding
Transforming your home's basement into a finished space can prove to be very rewarding. Frequently the additional living space is used for a variety of entertainment functions including: Recreation Rooms, Bars, Gyms, Billiard Rooms, Home Theatres...
Selecting the Right Air Compressor for Your Air Tool
An air compressor is used to power air tools such as spray guns, air sanders, air wrenches, air hammers, and much more. While not as widely used, air tools are more powerful than traditional electric power tools. Air tools offer more torque and...
Top Pool Heater Maintenance Tips
There is nothing like a round of swimming in a warm-water pool in chilly winters. A warm water swim/ bath is a perfect exercise for your whole body and mind. In fact it is extensively used for therapeutic purposes all round the world. So...
When Fire Strikes: Get Out! Stay Out!
(ARA) - It’s late at night and you and your family are sound asleep. Suddenly, you are awakened by the piercing signal of the smoke alarm and you realize there is a fire in your home. Do you know what to do to survive?
According to the...
|
|
| |
|
|
|
|
Electrical Industry's Protection - Destruction for Good
Destruction! Blow Up! Eliminate! These are not pleasant words!
Unfortunately, when it comes to safety we have no other choices.
In the electrical industry, fuses are destroyed in order to
protect lives or property.
Whenever there is a big fault in the power lines, possibly caused
by short-circuiting, fuses are very helpful to stop the flow of
current.
Unlike circuit breakers, fuses have no mechanical moving parts
that can fail to operate. A fuse is just an electrical link in
the circuit that can melt very quickly whenever a certain
temperature is reached.
Fuses have 4 things to do in a circuit:
1. They must sense faults
2. They must open quickly when a short-circuit occurs
3. They must also sense the normal overloaded conditions, but
must open if the overload becomes excessive or prolonged.
4. They must not change or alter the characteristic of the current
during normal operation.
Early types of fuses use lead wires, selected based on their
diameters, connected to terminals. These types have some
disadvantages. Whenever a fuse blows, the molten metal spatters
over the equipment and could cause injury to people or cause fires,
especially when the arc was not confined.
Later, cartridge fuses replaced the old lead wire fuses. These
consist of non-conducting cylinders which contain soft metal fuse
strips. The strips are connected to the ends of the cylinders by
/>
metal caps or ferrules. The entire cartridge fuse is mounted onto a
matching fuse block.
Even these cartridge fuses have 2 types - those with renewable fuse
links and those one-time non-renewable types. The only advantage of
the renewable type - they are more economical because the cartridge
can be reused. However, more precautions are needed with regards to
the cleanliness of the contacts, the securing of the cap bolts, and
the choice of the current rating of the link.
Whenever a fuse blows, it means there is already a big fault in the
circuit. Electricians must be especially careful during this time
and take the necessary precautions. The fuses blow up for safety.
Don't cause another blow up!
Until next time...
Are You Stumped by Complicated Electrical Calculations?
Learn Electro-Technology Calculations for 1st Class Marine
Engineers Competency License Exams at Electro-Technology
Questions & Answers e-book. Applicable for all electrical
installations both on ships and at shore.
Many years of working experience in Marine, Facilities,
Construction has given the author material for writing e-books
and articles related to engineering, and management. Subscribe
to facworld ezine
More information at Life on Ships and
Mechanical Engineer
|
|
|
|
|
|