Electronics Forum / Electrical Engineering / November 2005

I live in small rented flat. Recently I found that each time there is a
thunderstorm, a bolt of static discharges through one of the sockets in
my bedroom. I've checked the building's earthing but it appears to be
ok. This problem persists. Does someone have ideas on what could be ...

Hi ive just got part p ,one question  when you change over to a new fusebox
and fill in the domestic installer cert, what circuits do you fill in  on
page 3 is it just the mains or do you have to test all the circuits and fill
it in even if you havent installed them, thanks

For years I have used the watt-hour meter at the service entrance to
measure the rate of power consumption.  I'd switch off all circuits
except a known load, such as incandescent bulbs or a water heater, then
time the on the meter disk to determine the constant in the relationship

I want to know that the fuse Characteristic is general standard(e.g.
IEC or IEEE) or each company can define a trip curve .

In a residence I recently inspected I used a circuit tester designed to
verify both GFCI and AFCI circuits. For the circuits that had switched
split wired receptacles, when the circuit is energized, the tester
indicated wiring was correct and on the AFCI protected circuits, the

I have a question, let's assume an idea op-amp with the non-inverting
grounded and a 100nA current source into the inverting input.
On the output, you have a 10k resistor, a 10k pot, and a 3k resistor to
ground all in series.

CON Edison - CONNING US with HIGH VOLTAGE!
Shocking (literally) how this greedy utility monopoly and others like it get
away with their screw-the-public practices. I've noticed that my light bulbs
burn out faster than they should. I am an electronics engineer and have test

Hello experts.. I am not an electrician or well versed in electrical
problems, I can do easy wiring jobs. We tend to be self-sufficient in most
home renovations. I have an old home that was rewired about 25 years ago.
The service panel in the basement was replaced about 8 years ...

What is the average length of a branch of an AC high voltage line?

I have a BM10 megger and it doesn't work, at least one component inside
has mechanical damage and the markings on it cannot be read. I believe a
proper service manual will have a full schematic (the manual for the BM7
does). Help.

I'm a 3rd year EEE undergrad and am conducting a project into the sources /
victims of RFI as well as possible solutions to the problem, can anyone
suggest any particularly good standards to read?
So far I've looked at BSI:

Can't find supplier for 6x25mm 10A/250V fast blow ceramic fuse.  Anyone know
where these may be purchased?

I have a cabinet shop,the two motors in question are 3hp 230v 1ph
17fla.Ive read
the posts about 30A bkr on a 12AWG THHN.
Does that apply also if my branch circuit is

A few months ago I picked up some of those "new" poke in connectors that are
supposed to be as good as wirenuts.
I finally had an application where I needed it when I installed two J boxes
in my attic.

Does anyone one knows if Siemens type Q breakers are rated for 50Hz? I want
to know if I can buy a load center and breakers from the  US to be used in
Africa, where the Voltage is 220-240V and 50Hz frequency.
Thanks.