Lamp Holder Voltage When Switched Off....

[matt.leung]

Hi,

Went to a job today and found that there was 78 volts following through the lamp holder when the lights where switched off at the wall..... other than a poorly wired hidden junction box somewhere, is there another explaination for this... and i am assuming this is why bulbs keep on blowing rapidly...

 

[SPECIAL LOCATION]

Lamps are blowing because they are cheap crap manufactured by peasants who are paid peanuts in a factory with no quality control...

The "Voltage" is NOT there!! 

If there was 78v when off all the lamps would be glowing when off..

It is an apparent induced voltage on a conductor that is connected to nothing running in cables parallel with cables that are carrying a voltage....

(Think what you have..

one wire is open circuit at switch and open circuit at lamp = a bit of long wire acting like and aerial)

Do a search this topic has been discussed numerous times...

The fault is due to the person reading the voltage not understanding how the test meter they are using actually works..

or the concept that magnetic fields around conductors can induce current into parallel conductors...

(same principle how transformers work)

:coat

 

[kerching]

My Fluke T 150 has a button to get rid of phantom voltages

Just saying

 

[steptoe]

My Fluke T 150 has a button to get rid of phantom voltages

Just saying

thee is one of them on my probe tester too,

and, there is one on my neon as well,  

 

[binky]

You just can't beat a 

Screen Shot 2014-04-02 at 18.40.02.png

and where do you insert that then????