George you just can't seem to get a fix on the subject matter but just like to argue :-)

"So he unplugged equipment 'after' he measured 48 volts, which means that
equipment was leaking current into the tank"

NO IT DOES NOT

Almost anything electrical will produce "Induced Voltage", without any leaking what so
ever. Electrical equipment produces a electrical filed, which cause induced voltage ,
i.e.. wires, motors, lights, sockets. You can actually take a 10 gal aquarium full of
seawater and stick in front of a wall socket and it will induce a few volts. YOU DO NOT
NEED CURRENT TO GET VOLTAGE. A lamp cord going to a lamp on the table and passing behind
you tank can induce voltageint the water. We have beat this subject to death over the
years, do a search on it, here or the internet. There are many articles on it, some by
electrical engineers, who have tested and studied it well. Do you know what an Amp-Clamp
is and how it works ? Most voltages in the aquarium are meaningless. 48 volts is nothing,
start getting worried when it reads 90 or 100, etc. that is a leak. After years of debate
it is felt by most authorities always install a Grounding probe and GFCI.

So, do you want to listen this time or argue ??

Have a nice day

--
Boomer

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Former US Army Bomb Technician (EOD)
Member; IABTI, NATEODA, WEODF, ISEE & IPS

If You See Me Running You Better Catch-Up