Electronics Forum / Electrical Engineering / February 2007

I have a problem with a circuit in my apartment that continues to go
off and the maintenance hasa looked at the circuit and can not figure
out why it keeps going off. The circuit breaker doesn't trip off, th
ecircuit to the bedroom and bathroom will go off and within minutes,

I have replaced all stator coils of the 500 kW 3.3 kV motor. The
winding phase resistances are exactely equal to the designed one, also
the insulation is tested (HV Test & Tan Delta- Capacitance test) and
is OK. But during No Load trial of the motor, the no load current has

Hello, I'm working on a mains powered design and am having
difficulties finding a wall plugin 'shell' to use for my design.  I
would like to place a custom PCB inside the wall plugin (picture a
cell phone charger, and cut the cord) and have my circuit mains

Have wired up a domestic house in Spain using 2.5mm, Brown live, Blue
neutral and Yellow/Green earth. I have been told this is wrong and that the
live conductor should be Black, anyone have any input on this? This is the
power circuit not the lighting.TIA.

Tony
Nottingham
England
26 February 2007

After removing the cover to investage lines down my laptop lcd screen i have
found some strips (thin plastic strips looking like FILM out of a camera)
when i move my finger nail along one of these strips the screen checks
perfect, although when i remove my finger from that ...

I have obtained a device which reads Volts,Watts,Amps,and kWH which enables
me to find out what a particular device uses in the way of electric power.
My main use is in finding out how much my water pump uses which pumps water
from a near source to my house. The pump is controlled ...

I would like to convert a normal 15 amp circuit to a 30 amp circuit.
I also need ot convert the wall plug over.  If this is iin a
commercial building that is over 30 years old will I need to do
anything else besides swap out the breaker and install a new plug?

Can anyone point me in the right direction ?
We're a plant in the UK which operates a large number of plastic extrusion
lines.
TIA,

I need to take the overcurrents off a motor starter in an MCC. The
problem I have is that the motor starter is racked into a live 600
Volt bus. I want to know if I can rack out the motor starter without
isolating the whole MCC (there is only 1 bus in the MCC). Is this

Why do we ground the metalic sheath of the cable??

SETUP:  200 AMP Main Panel connected to a 100 AMP sub-panel via metallic
 nipple. A 75 AMP breaker in the main panel feeds the sub via #4
conductor.  The Neutral is isolated from the ground in the sub.  Bare
grounding conductors are attached to the subpanel through an equipment

I think transmitting high-speed signals is very easy when you have a
360-degree ground reference, round conductors,
and no other nearby signals like in coaxial cables. My aim is to design PCB
tracks as much like a coaxial cable as

Came across a 90's vintage IR controller for printing industry (drives Q-H
lamps for drying ink in the paper path) that uses a single-digit 7-segment
display that looks like a nixie tube (more like a white-hot wire segment)
display. The 16-pin DIP socket is marked IEE-Atlas, and ...

I need to mount a 4" octagonal (or circular) box within an exterior wall
for a porch light. Since this would be considered an "Old Work"
application, does anyone have a suggestion on how to hang the box.
Try as I might, I've been unable to find an old work box of this type.