Electronics Forum / Electrical Engineering / April 2005

Is there any code, standard, reference, or documentation that states
how many times a circuit breaker can be cycled safely after it has
tripped? Also, are there a set number of times a circuit breaker can
trip before its overcurrent properties begin to degrade?

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Hi Roy...
can you fill me in on who controls the work done in most of
NYC's hotels and office buildings.. in the 3 to 10 or 20 story

I am interested in transmitting video through a chip, but am not sure
which chip to use and am new to RF (still reading all i can about it.)
Do i need to add a modulation stage, or will most RF chips provide
this stage? I was thinking a 2.4GHz chip such as a ICS V385 8-bit LVDS

Looking at using schottky diodes as battery diodes for use in split
charging systems.  Are these bits of kit the sort of thing to use??
http://uk.farnell.com/jsp/endecaSearch/partDetail.jsp?SKU=481361&N=401
and

Call for Papers
The new international academic journal "Nature and Science" is inviting
you to publish your papers. Please visit
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A regular light bulb lasts 2000 hours at 60W.
An energy saving bulb lasts 6000 hrs at 11W instead of 60W.
If the electricy price is 1 dollar per Kwh, would it be correct to assume
that the regular bulb costs $1/1000 x 60W x 2000 hrs = $120?

Moved into a 30 yr old house with a forced gas hot air heating system.
Saw something near the furnace wiring which I'm not familiar with.
Seems like they have a regular 4 inch square type gang box
mounted in very close proximity to the furnace with what looks

Just checking to see if I understand joules.
1 Joule = 1 Watt * 1 sec, or J = 1Ws
If 1.5M Ws is the energy dissapated by a resistor (with a value 2
Ohms), does this mean that there is 866 Amps every second thru the

What happens to cause an electric motor to burn up or short out?
I'm currently taking a physics class and this question was posed to
the class by the professor.  In the movie "The Grinch Who Stole
Christmas" the Grinch has a large toy monkey that crashes two symbols

My sister-in-law has an old "Pushmatic" breaker panel in her house, and the  
2-pole 30A breaker (P230) that her clothes dryer is on has started tripping
randomly. From what I've read this is a fairly common problem with
Pushmatic breakers. The dryer is fairly new and the wiring ...

Consider a 3-pole circuit breaker with the pole sections side by side
so that pole 1 and pole 3 have pole 2 in the middle.  This is a very
typical circuit breaker design for molded case breakers from companies
like Cutler-Hammer and Square-D.  These typically have a voltage rating

I have a slightly unusual project I wonder if someone can help with. I
need to customise a guitar to include 20 4.8v 3A torch batteries. They
will be powered by 2 4.5V Alkaline batteries, the tricky bit is that i
need the lights to flash on and off in groups of 4 or 5. Basically I

Please can somebody tell me the easiest way to control the voltage output of
induction generator.
The generator is three phase 11 kW, excitet by capacitor bank of 240 µF; as
a prime mover a tractor of 30 HP has been used. The speed of the generator

Hi
I am looking for some specific files found on the IEEE server.
The files are unavaileable to me since i am not a IEEE member.
Can somebody who is IEEE member get me these files as follows:

If anyone is familiar with telco construction practices, maybe they can
answer this one.
The local telco was installing a brand new overhead line from the
central office near me a few months ago. I stopped by and asked one of