Why do I have 30V across a three-way switched outlet when it is off?
I am remodeling my kitchen and installed new outlets for above cabinet LED lighting that plug in to a standard 120V outlet. I have three outlets near the ceiling; half the outlet is constantly hot and the other half is on a three-way switch. I have my constant, the three way works perfectly, yet when there is no power on the switched portion of the switch I read 30V across the switched outlet!
Now, I ran 12-2 with a ground for both sides of the outlets. The outlets and switches are wired properly. I am thinking one of two things, 1) my digital meter is too sensitive and is reading some induced voltage from the hot 12/2 in the box or 2) my meter doesn't put any resistance on the circuit and gives me this junk! I haven't checked the current on it because my ammeter is broken, but I am pretty sure there isn't anything there current wise.
Just wondering if this is "normal" given my situation? Any ideas?
It could also be that you have a poor neutral in the system such that it is slightly above ground - do you get voltage to any other ground or just within the outlet? And is the voltage you read the same from hot-to-ground as well as from hot-to-neutral? If there is _any_ difference, start with that.
Otherwise, are you sure you are reading the meter correctly? I have an auto ranging Fluke that will shift to millivolts such that if I do not pay attention I will think I am getting a reading - and adjacent current is usually enough to induce a few MV.
The next thing you might try is unplugging the lights and try measuring for voltage across the switch itself, both legs as it is a 3-way. If you get anything at all, there is some sort of leak downstream from the switch - and do this test on both switches.
Lastly, LED lamps use a rectifier and some method - either transformers or regulators - to produce low-voltage DC for the LEDS. Often these solid-state components are quite leaky - but only for miniscule amounts of current. Do you still get voltage with the LEDs unplugged?
The make and model of your VOM would help.
Can a 12VAC power supply damage my 12 VDC LED lamps?
I bought an interior lighting for my new cabinet but I later found out that its supply is 12VDC. MY transformer for my power supply is 12VAC. Will it work for my lighting or it will damage it? The lighting that I bought uses LED lamps.
Unless your light are rated from both AC/DC, it's never a good idea to try. Your light will more then likely stop working.
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