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A Look at Retractable Awnings
Awnings are popular for many reasons. They not only add style and elegance to both residential and commercial buildings, but can also greatly increase energy efficiency. The combination of these factors has made awnings one of the favorite...
Condensers - The Liquid Producers
Some people call them capacitors. Others call them condensers. These components store electrical charges. Mechanical systems also have condensers. Condensers are found underneath steam turbines. Air-conditioning systems have condensers too. ...
Electric Radiant Floor Warming: the Affordable Luxury
(ARA) - Mountain climbers have an old saying: "Don't cheat your feet." A homeowner might consider this advice when building or remodeling a bathroom or kitchen floor.
For floors, homeowners know that ceramic, slate or marble tiles are...
Flipping Houses for Profit: Start with the Right House
Many real estate investors enjoy "flipping houses," or buying and selling houses quickly for profit. Not all flips are fixers; however rehabbers make millions turning ugly houses into dollhouses. On the other hand, some inexperienced investors...
Tips for Working on Plaster Walls
If you live in an older house, say 50 or 60 years or older, there is a good likelihood that you have plaster on your walls. Plaster walls were very common, especially in the late 18th century and 19th century. Plaster was fairly readily available,...
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Schreiber, Johansson Build A 'Bridge' To A Classic
Liev Schreiber and Scarlett Johansson are starring in a widely praised revival of Arthur Miller's <em>A View From The Bridge</em>. They tell reporter Jeff Lunden that as in all great tragedies, this one's clashes and catastrophes have something of the inevitable about them.
Stargazing At The Opera
The Hayden Planetarium in New York takes opera to the moon with a new production of <em>Il Mondo Della Luna.</em> Diane Paulus and Philip Bussmann talk about merging cosmos footage with music, how science can enhance the arts and the future of technology and theater.
Obama 'The Musical' Opens In Germany
A new theater production <em>Hope: The Obama Musical Story</em> opened this week in Frankfurt, Germany. It tells the story, in song and dance, of America's first black president. It is likely to be a big success in a country where President Obama is still immensely popular.
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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
It's 'Shatner's World' And He Wants You To See It
he wild range of roles played by William Shatner over the past half-century goes well beyond Captain Kirk. Host Scott Simon speaks with the pop culture icon, who's returning to Broadway for a one-man show, <em>Shatner's World: We Just Live In It</em>.
How to Build a Shed
The easiest way to build a shed in the backyard is to make a trip to the local Lowe's or other hardware shop to purchase a shed-building kit. Never choose one from a picture in a brochure or from the Internet. When viewing in person, you can...
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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...
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More information at Life on Ships and
Mechanical Engineer
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