Originally Posted By: dbush
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Which of the following is not correct?
READ CAREFULLY
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Dave Bush
MAB Member
"LIFE'S TOUGH, WEAR A HELMET"
Which of the following is not correct?
READ CAREFULLY
Originally Posted By: Blaine Wiley
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Need em a little tougher, Dave!!
Originally Posted By: Ryan Jackson
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I’m guilty of using a plug tester as well, but from what I have read using the test button on the receptacle itself is the only method the manufacturer gaurantees as accurate!
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Ryan Jackson, Salt Lake City
Originally Posted By: jpope
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I have had GFCI outlets where the test button causes the reset button to snap out, but there is still power to the receptacle. With that, I can guarantee that they are not always accurate.
I say, test them several ways, several times. 
--
Jeff Pope
JPI Home Inspection Service
"At JPI, we'll help you look better"
(661) 212-0738
Originally Posted By: bbadger
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If you read the directions you are supposed to use the button on the GFCI and verify the voltage drops out.
A nice EC&M article on GFCIs which includes testing. Note it was written before the smartlock GFCIs came out.
http://ecmweb.com/ar/electric_think_gfci/
Using a GFCI tester on a non-grounded circuit does not test anything and exposes the operator to a shock hazard.