tv outlet shock

[sparktobe]

would anybody know why i would get a shock from the back plate of a tv outlet and the backbox the tv at the time was on. duh? but i didnt think i would recieve a shock as i pulled in a cat5e cable. when i measured the voltage was 108ac and 68dc? "now iam pit deep in the 5 day leauge"

 

[Andy™]

Voltage cant be AC and DC as you have said... its one or the other

may be something faulty in TV allowing voltage only aerial inlet

 

[Robojin]

Voltage cant be AC and DC as you have said... its one or the othermay be something faulty in TV allowing voltage only aerial inlet

What about induced current, never seen it myself, but since we have to separate LV by 50mm, just a thought

 

[Andy™]

What about induced current, never seen it myself, but since we have to separate LV by 50mm, just a thought

induced could give a voltage if using a high impedance voltage tester

may possibly give a slight tingle too, but i dont think thats too likely

 

[batty]

I had this on a job once I think there was about 80 volts at the tv points can't remember the outcome though.

Batty

 

[Andy™]

what part are you getting the voltage at? the signal core or the outer RF shield?

 

[sparktobe]

my meter is a digitek info1287

i also thought the voltage should be one or the other but just checked again and ac and dc same readings. what makes it more strange is the av cable from the tv is not connected to the back plate??????

 

[oliver1234]

Is there a distribution amp somewhere?

If so disconnect the relevant cable from the amp and measure the voltage at the amp both on the cabel and on the amp outlet.

 

[sparktobe]

what part are you getting the voltage at? the signal core or the outer RF shield?

the voltage readings are the same on the signal core or the outer RF shield

with the tv and sky box off readings are the same???

 

[Andy™]

define 'off'

In standby, there will still be 'in use'

is there a voltage between signal core and shield?

 

[SPECIAL LOCATION]

Is there a distribution amp somewhere?If so disconnect the relevant cable from the amp and measure the voltage at the amp both on the cabel and on the amp outlet.

; )Applaud SmileyApplaud Smiley

I would have thought something along these lines also.

a distribution splitter or mast-head amp with PSU between TV & aerial wall socket outlet.

They can give a little zap across you fingers if you touch the wrong bits?

 

[Andy™]

; )Applaud SmileyApplaud SmileyI would have thought something along these lines also.

a distribution splitter or mast-head amp with PSU between TV & areal wall socket outlet.

They can give a little zap across you fingers if you touch the wrong bits?

i thought that too, but the voltages dont seem right for an amplifier. they are usually around 9V

 

[oliver1234]

Where ar you actually measuring the voltage to?

You say the voltage is present on both the core and the screen but if one probe of your meter is on the screen where are you putting the other probe?

 

[sparktobe]

Is there a distribution amp somewhere?If so disconnect the relevant cable from the amp and measure the voltage at the amp both on the cabel and on the amp outlet.

no distribution amp just an aerial in roof space.

 

[oliver1234]

i thought that too, but the voltages dont seem right for an amplifier. they are usually around 9V

I agree, I just thinking that there may be a short between an aerial cable ans a live cable somwhere and by disconnecting the cable under test from the amp it will narrow it down as the fault may not actually be on the cable he is testing.

I would be testing the current as well, if it is an induced voltage the current will be pretty low.

 

[Andy™]

I agree, I just thinking that there may be a short between an aerial cable ans a live cable somwhere and by disconnecting the cable under test from the amp it will narrow it down as the fault may not actually be on the cable he is testing.I would be testing the current as well, if it is an induced voltage the current will be pretty low.

using a low impedance voltage meter will quickly tell you if its induced or not

although a amp is usually a lower voltage, it may be that was is faulty and allowing too much voltage onto circuit, although ive never came accross it before

 

[Apache]

I don't understand what the op is measuring the voltage across?

Where exactly are you placing the probes?

 

[sparktobe]

I don't understand what the op is measuring the voltage across? Where exactly are you placing the probes?

one probe on the plate and one on the back box

current 0.2ma

 

[spinlondon]

Is this with the cable plugged into the sky box?

You get voltage from the sky box to control the LNB.

Is there another sky box on the system?

 

[sparktobe]

Is this with the cable plugged into the sky box?You get voltage from the sky box to control the LNB.

Is there another sky box on the system?

the only thing that i have connected to the plate is the aerial in the roofspace about 10 years ago dont use it much now as we use the sky separate cable through the wall