Electronics Forum / Electrical Engineering / March 2008

I have a 3 section 3 phase MCB rated at 25A.
Is this 25A total or 25A on each phase?
TIA.

how many watts of conditioner power are needed to dissipate the heat of
1 watt of electrical equipment, keeping the conditioned room 8 degrees
celsius (46 Fahrenheit) below the temperature of the external environment?
Suppose small room and thermically insulated.

Please excuse the elementary question, but with
a 5 foot fluorescent light the LPF and HPF types,
(with and without a fitted power correction capacitor).
On a conventional domestic supply meter, which would

why we are connecting fuses to phases alone and why we are not
connecting for neutral?

I NEED 2 KNOW WHETHER THE RESISTANCE IN AC AND DC, ARE SAME R
DIFFERENT....IN AC V R DEALIN WID PHASE ANGLE N SAYIN TAT BOTH WERE IN
PHASE(CURRENT N VOLTAGE)....COULD ANYONE SUGGEST THE REASON BEHIND
THIS? IN DC V R SAYIN TAT BOTH WERE HAVIN LINEAR RELATIONSHIP ! SO

I've got a question and I hope I explain it right.  Lets say you measure the
voltage between two points, and you have a value, which is the difference
between the two points.  Lets say this value is 100 volts ac.
Does this tell you anything about the ability of those two points to ...

what will be the overloading capacity of a 800kva transformer if it is
connected to an induction motor of 635kw ? how to ascertain the
sustainability of the same ?

I bought a PAR (parabolic reflector) compact fluorescent lamp (CFL) that
is supposed to producer light equivalent to that of a 100W incandescent
lamp. It is easy to see the coiled nature of the tube itself insed the
envelope.

This might seem like a somewhat frivolous question, but I am trying to
find the authoritative way of drawing a battery "cell" in a circuit
diagram.
I found references suggesting that the version with two lines (one

Wondering if somenoe can point me to the right direction.
I am doing a renovating project for a few Scandinavian houses. Some of
these houses do not have any current protection fuse boxes.
So the bathroom furnitures that I use during renovation, must have its

I am attempting to layout a PCB based off an existing "reference
design".  I have a "Bill of Materials", physical copy of the board,
and a few design documents etc..
I'm stumpped on one section:

please give information

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We have this old (60's?) Doerr AC motor 115V, (Model 60455/E 801)
1/3 HP, single phase and we would like to buy a controller for it.
But the seller wants to know, if it's split capacitor or split phase AC
motor.

we have a server room in a place that is backed up by a diesel generator
but does not have an UPS, so that the electricity can go down for about
1 minute before the generator can be fully working.
We a lot of new servers now which can draw up to 12KW, tri-phase (but it