Low voltage transformer issue

jaimslawOctober 25, 2011

My vista 600 watt low volt transformer rings out at 12.5 volts at each if the 12 volt multi taps. My readiing at one fixture 85 feet away on 12/2 also reads 12.5. Input to he transformer reads at 118.

Question: is this an indication of a faulty transformer? I shouod see some voltage drop on a run like that as well.

Is tis a sign of a faulty meter?

I would that that no matter what the input voltage is, those taps should be outputting at an even 12 volts, not 12.5.

Very perplexed. Would not want to return the transformer. Its brand new.

Help?

Thank you for reporting this comment. Undo
brickeyee

"I shouod see some voltage drop on a run like that as well. "

Voltage drop only occurs is current is flowing.
Most meters are high enough impedance you would see almost no drop over the distance you have.

Voltage drop is the current (amps) times the resistance of the path (ohms).

No current, no drop.

An unloaded transformer ALWAYS measures higher than it rated voltage.
There is no current flowing in the secondary that acts to lower the output voltage.

Transformer outputs fall in voltage as the current they are supplying rises.

    Bookmark   October 26, 2011 at 2:22PM
Thank you for reporting this comment. Undo
jaimslaw

Thanks for your expertise. I did test the line voltage st the end of the run, only this time, i had the bulb in and sure enough, voltage was 11.5 VAC. All of the landscaping tips tell you to test the voltage ag the end ofthe run, but fail to mention that testing should be under a load, not just touching the bare wires.

So you are spot on with your reply. Again, thanks for your input.

    Bookmark   October 27, 2011 at 12:58AM
Sign Up to comment
More Discussions
Can I use a light fixture to define an entry??
We do not have a foyer. Our front door opens into the...
meanne74
Alternative to pot/can lights
Spoke to my GC yesterday and he suggested that I use...
abbabug
2015 Title 24 and LEDs
Hello all, I'm looking to install LEDs in a house that...
elcabezon
looking for some direction choosing leds for family room
I want to add some recessed led lights to the family...
gwald
linen lighting shades
do linen shades hold up well in bathrooms?
wldougall
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™