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I have an ungrounded outlet right next to an old-style four pronged telephone jack. With a temporary setup I get a good ground per my outlet tester when grounding the outlet via the grounding prong in the telephone jack. I want to use a 1amp AC/DC converter on this outlet, and I want it to be grounded. Can I take advantage of this nearby phoneline ground or is the wiring too small for a safe ground for this converter?
 

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With a temporary setup I get a good ground per my outlet tester when grounding the outlet via the grounding prong in the telephone jack.
There is NO ground prong on a tel jack.
 
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Some telephone blocks have as big as an 8 gage ground. Better check the size!
Yes, possibly where the service enters the house, but sure as heck not at a telephone jack! He's talking about an old 4 prong jack, sot a service entrance block!
 
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