Crazy tank voltage from LED lights.

barkergk · 07/12/2014, 08:54 AM

Isolated a 50 volt AC stray tank voltage to my LED fixture that runs on 24v dc. How is that possible? No part of the fixture is touching the water. Voltage drops to a couple of volts when I turn rhe lights off. ***?

zachts · 07/12/2014, 12:39 PM

Is your tank on a GFCI (doubtful since it would have tripped) and are all your outlets wired correctly. sounds like a wiring problem. unplug everything else, does the voltage go a way with only the light on? Also if your getting current with the lite off then the problem is another device leaking.

barkergk · 07/12/2014, 12:50 PM

It is on a portable ShockBuster GFCI and it does not trip (trips on test correctly. Voltage is present only with light ON and everything else OFF. What especially makes no sense is that the light runs off a 24v DC transformer so how 50v AC could be produced by the light is crazy.

mcgyvr · 07/12/2014, 02:02 PM

Its more than likely just capacitively coupled static voltage from the AC side of the power supply. With high impedance meters you can pick that stuff up all the time. Usually up to 50% of the supply voltage)
Its normal and not a problem at all.

barkergk · 07/12/2014, 04:56 PM

Thanks mcgyvr. I had already decided that I wasn't going to worry about it, but I am glad to have a rational explanation.

07/12/2014, 08:54 AM	#1
barkergk Registered Member Join Date: Jul 2014 Location: Denver Posts: 4	Crazy tank voltage from LED lights. Isolated a 50 volt AC stray tank voltage to my LED fixture that runs on 24v dc. How is that possible? No part of the fixture is touching the water. Voltage drops to a couple of volts when I turn rhe lights off. ***?

07/12/2014, 02:02 PM	#4
mcgyvr Registered Member Join Date: Sep 2003 Location: North Carolina Posts: 20,050	Its more than likely just capacitively coupled static voltage from the AC side of the power supply. With high impedance meters you can pick that stuff up all the time. Usually up to 50% of the supply voltage) Its normal and not a problem at all. __________________ Who me?

07/12/2014, 12:39 PM	#2
zachts Registered Member Join Date: Mar 2005 Location: St. Louis, MO. Posts: 3,259	Is your tank on a GFCI (doubtful since it would have tripped) and are all your outlets wired correctly. sounds like a wiring problem. unplug everything else, does the voltage go a way with only the light on? Also if your getting current with the lite off then the problem is another device leaking.

07/12/2014, 12:50 PM	#3
barkergk Registered Member Join Date: Jul 2014 Location: Denver Posts: 4	It is on a portable ShockBuster GFCI and it does not trip (trips on test correctly. Voltage is present only with light ON and everything else OFF. What especially makes no sense is that the light runs off a 24v DC transformer so how 50v AC could be produced by the light is crazy.

07/12/2014, 04:56 PM	#5
barkergk Registered Member Join Date: Jul 2014 Location: Denver Posts: 4	Thanks mcgyvr. I had already decided that I wasn't going to worry about it, but I am glad to have a rational explanation.