westom wrote:

Assuming they are MOV based, read MOV datasheets to learn how MOVs
work and obtain relevenant numbers for the test. Perform a 1
milliamp test to confirm these numbers on that protector. This test
is described in some manufacturer application notes.


Been awhile since I looked inside, I'll have to open 'em back up and
see what numbers are on them (if any, I can't remember).

The test only confirms the protector can conduct. Does not say
anything about what makes a protector effective - the earth ground and
how it connects to earth. The best surge protection in the world can
be useless if grounding is not done properly.

Makes sense, I'll confirm that the service entrance ground is in good
condition, too.

Thanks,
Mike