"Hot" wire...

[cschmid]

laszlo tell us what happened and did you play with his mind even more..I know we used to put resistors on the neutrals of plc cards and other control equipment to help drain off the voltage..the induced voltage was high enough to cause small electrical items not to work properly..but never did I receive a shock..

 

[LarryFine]

Here is a prime example of induction.....take a fresh roll of 14/3 ....connect ONLY the black and white conductors....like so:

Now do the same test with a solenoid tester.

 

[celtic]

Now do the same test with a solenoid tester.

Here is the link to a previous thread that lead to this "experiment":
Scientific Test

Since you missed the link to the thread...Not a problem...here it is :

Here are some pic.s from a very scientific test I performed a short time ago.

Testers used:
Ideal Circuit Tracer (Just the one piece)
Ideal Vol-Con (about 21 years old)
Fluke T2
Fluke 87
AWS Snap 8
GreenLee GT-11

....shown also is one partial roll of 14/3 NM

I stripped back both ends of the NM and jammed the black and white wires into a working outlet ~ the red and EGC are not connected to anything...using the Ideal Tracer to show that the recept is HOT:

Next...
We did NOT detect any voltage with the Vol-Con:

Next....
We sensed a voltage using the Fluke T2:

Next....
We sensed a voltage using the Fluke 87:

Next...
We did NOT detect any voltage with the Snap 8:

Finally....
We sensed a voltage on the red wire...on the end of the NM that was inserted into the recept. using the GreenLee GT-11:

 

[kspifldorf]

I think some people call it Ghost Voltage. I've read up to 70 volts on a good meter Fluke in a huge control cuircit on it's spares.:roll:

 

[ELA]

...and the winner is!

Induction or capacitive coupling?
I would think that both must be considered.
The test shown here where the roll of romex is used is interesting. I would call that capacitive coupling since there is no current flowing in the conductors, thus no magnetic field to cause induction.

It would be interesting to perform this test with various load currents flowing through only the black or white wire (so magnetic fields do not cancel) and with one end of the red wire grounded (forming a single turn transformer). This would help distinquish between "induced" voltages and capacitively coupled ones.

Capacitance between the conductors will produce this "ghost" voltage that a wiggy will load down and make "disappear".

Capacitively coupled voltage can and will shock you. If the cable length is long enough and you are grounded this could be very hazardous. We have heard of GFCIs tripping when the cable length is too long (due to capacitive leakage).

 

[celtic]

Induction or capacitive coupling?
I would think that both must be considered.
The test shown here where the roll of romex is used is interesting.

That Scientific Test is a smaller study that was conducted in reference to a larger "problem" ~~> NM and induced voltage ....which was part of this problem ~~> Kidde i2060 and KN-COSM-IB

 

[cschmid]

not the cowboys go Vikes!!!!!

 

[celtic]

.... go Vikes!!!!!

Who?:-?


LOL


Here's an explanation of what's next: #22

 

[cschmid]

mn plays dallas on sunday and of course we are vikings fans here..

 

[Dennis Alwon]

mn plays dallas on sunday and of course we are vikings fans here..

Is that mn cable or what?

 

[cschmid]

I wish it was MN live but five hrs to the twin cities means it is satellite on flat screen and cool refreshing beverages and good food..So I guess it is 90degree rated cable..

 

[celtic]

mn plays dallas on sunday and of course we are vikings fans here..

Dallas - 5/1
Vikings - 2/3

Where shall I send the mass card after the slaughter?

 

[cschmid]

LOL I know sometimes the practice squad wins..I believe it will be a tough game as Dallas wont be able to run the ball and I doubt they can stop us from running the ball, so it all amounts to whether we stop the pass..
all of our losses have been less than one score and with a rookie QB sooner or later we shall break it out and win some.. :smile:
I would think the hot wire should be purple and Gold....

 

[celtic]

This is a CHEERLEADER - not a RUNNING BACK
You might want to pass this along to the coaches.


LOL

 

[cschmid]

Now these are like capacitors used to excite the fields of fans.

Man I must learn how to put photo right on post..

 

[cschmid]

not slaughtered by no offense...

 

[celtic]

not slaughtered by no offense...

dead is dead :wink:...Dallas 24, Minnesota 14

 

[ZZZ]

We used to have a building with a 480 ungrounded delta and I would stick my finger in it occasionally to surprise my helpers. One day I tried that and found one leg had gone to ground through worn insulation. I am much smarter now:wink:

 

[celtic]

We used to have a building with a 480 ungrounded delta and I would stick my finger in it occasionally to surprise my helpers. One day I tried that and found one leg had gone to ground through worn insulation. I am much smarter now:wink:

I heard that story about you too there "Lefty"