Swimming Pool light stray voltage?

[sk614]

I recently decided to do a pool light replacement to LED (we just moved in).  The pool light is 12vac from a step down transformer.  During the repair I shut off the main pool breaker, disconnect the 12VAC output wiring from 120vac pool transformer and shut off local pool light transformer breaker.  However when I removed the pool light under the water I feel a tingling/shock in the area of the pool light.  Putting my hand further away no sensation.  Using a DMM I measured ~3Vac at that light niche area at 60Hz.  I went to shut off house main breaker and even doing so I still feel tingling/shock around original light fixture.  As for now the pool is under quarantine until I can get a technician out.

[Gregg]

Make sure you have a really good ground to neutral connection at the main service entrance; only one ground to neutral ground connection.  If you have sub panels, check that they do not have the bonding screw installed.
You seen to be getting some potential feedback on the neutral if turning off the main still shows voltage.  This may even be from a neighbor with a poor ground connection.
Consider multiple ground rods connected together and then to the main neutral ground bond.  Also you can ground one of the low voltage transformer leads to a separate ground near the pool if the transformer is totally isolated at the low output.