Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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RE: That's odd

Posted by Neuro (A) on September 21, 2008 at 17:30:48

In Reply to: RE: That's odd posted by crossram2x4@aol.com on September 21, 2008 at 16:54:24:

I saw that right after I posted. :)

I just checked out the manual:

Though virtually all domestically produced electronic equipment is designed to detect electrical shorts and other potentially
dangerous equipment problems in the Line lead referenced to its Neutral, this is inadequate when power is symmetrical. With
the IT-Reference 20i, both neutral and positive legs contain 60 VAC relative to their Ground tab. This is not a problem or safety
hazard, unless there is a defect in either the IT-Reference 20i’s transformer, or the power supply of a connected component. In
this instance, we need to assure that safety is always maintained. The solution is our GFCI (ground fault circuit interrupter).

The Furman GFCI detects any imbalance in the current flowing in the two hot legs. The missing current is presumed to be
flowing through the ground conductor (the round pin on an AC outlet). Ground current often indicates a dangerous partial
or full short circuit. If an imbalance is detected, the GFCI will trip the main circuit breaker/power switch. To restore operation,
correct the fault and turn the unit on again. 5 mA of current is enough to cause the GFCI to trip; to troubleshoot this type
of problem, start with nothing connected to the IT-Reference 20i. Then, add each piece of equipment until the GFCI trips.
Contact the manufacturer of the suspect unit for possible solutions.

Apparently, a button on the front tests the GFCI. Furman might've designed their own GFCI, but I'm not sure. Can you open the top and take a look inside?

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