09/09/2026
How does this meter help your drinking-water quality, plumbing-infrastructure longevity and personal safety?
This Fluke 1630-2 FC ground clamp measures two things: electrical current in milliamps and grounding-loop resistance in ohms.
In the second photo, the meter detected 26.76 milliamps of AC current traveling on my copper water pipe—and yes, this is my own house.
Why does that matter?
Unwanted electrical current on metal plumbing can accelerate corrosion, contribute to blue-green staining and pinhole leaks, and shorten the life of pipes, fittings, water heaters and well equipment. As plumbing corrodes, metals can also be released into the drinking water.
The meter’s resistance setting tests how effectively the grounding system provides a path for unwanted electrical energy. Proper grounding and bonding help protect people from electrical shock while also protecting plumbing and equipment.
A milliamp reading does not automatically mean there is an immediate danger, but it tells us that current is present and its source should be investigated.
Your well, plumbing and electrical systems are more closely connected than most homeowners realize. The right testing can uncover a hidden problem before it affects your water, damages your home or threatens someone’s safety.
Well Pump Pro — Five generations of groundwater knowledge.