Electronics Forum / Electrical Engineering / October 2003

I am upgrading my service panel to 150 amp.  The new panel is a lot longer
than the old panel and as a result some of the hot wires will not be long
enough to reach the breaker.  Am I allowed to splice within the service
panel or must I run a new line from a junction box?

I've heard talk of delta, star, line to line, Square root of 3, etc.
on this NG.
what do these terms really mean and what are their
advantages?

Within the last three days. One in evening and once in morning, The lights
shut down for about 1/4 second. The event in the evening caused my computers
operating system to re-boot, but the clocks were unaffected. The morning
event cause the lights to blink and a ceramic heaters fan ...

We are interfacing a motor control panel to an existing motor controller in
a bucket for a conveyer that carries coal.  My question is: is there any
standard that requires that the on and run lights be controlled from the
control panel or can they remain part of motor controller?

I would not have thought so, like say water loss in the water system.

Hi - I am about to replace my old power shower and discovered the following:
9.0kW (240V) shower, 6mm² wiring (run length less than 10m), 30A rewirable
fuse in consumer unit.
To my mind this should not be possible and should really require 10mm²

Is it feasable to fit a standard consumer unit without an RCD section (i.e.
not split load) and still get approval from the niceic?
The regulations seem to state that an rcd must be used for hazardous
conditions - therefore is an rcd socket acceptable for outside works such as

I have a 240 volt hot tub with a 50 amp circuit going to it and would like
to use the same wire run to power a 240 volt single phase air compressor.
I want to make sure, obviously, that I don't damage either unit, so I want
to get this right.

Can anybody tell me what is frequency measurment for on digital
multimeters?  Does that apply to AC power frequency, like 50 Hz or 60Hz or
is this something completly different?

The following is driving me nuts!
A few weeks ago our bathroom light started turning itself off after a random
amount of time (e.g. 30 seconds or so). When this happened turning the light
off and on again would make the light come on again for another period of

Jurisdiction:  USA
We had an electrical outlet installed at a dock
behind the house about 3 years ago.  The outlet
was several feet above mean high tide.  Naturally,

Boeing seeks FIPB nod for R&D arm
Partha Ghosh in New Delhi | September 20, 2003 11:19 IST
Boeing, the world's biggest aerospace company and aircraft
manufacturer, has decided to develop India as a research and

I know the basics on residential wiring, and have done various indoor wiring
projects, but I have a question for you regarding an outdoor project.  I
want to install a 30 amp 110V receptacle for an RV.  I purchased a
receptacle that is already mounted inside of a metal box.  I am ...

I was searching for some Tesla coil data when I stumbled onto this page.
http://205.243.100.155/frames/longarc.htm
Down towards the middle is an mpeg of an arcing substation with the
transformer finally exploding.

I had a little accident with the auger on the tractor. I tore into a 1
1/4" pvc conduit carrying the 220V 100A service from the main service
panel to the garage. I would think that there would be a product
designed to clamp around the undamaged ends of the conduit (watertight