GFCI receptacle question
GFCI receptacle question
(OP)
Since the GFCI does not use the equipment grounding conductor in the sensing circuit, GFCIs can protect non-grounding circuits and can replace two-wire (ungrounded) receptacles. However, my specific question deals with an isolation transformer that is protected (receiving power from) a GFCI receptacle.
IF there is leakage on the SECONDARY side of the isolation transformer, then the GFCI protection for the transformer (primary side) is quite useless, correct? It will not trip because it cannot sense any change, correct?
IF there is leakage on the SECONDARY side of the isolation transformer, then the GFCI protection for the transformer (primary side) is quite useless, correct? It will not trip because it cannot sense any change, correct?






RE: GFCI receptacle question
You need separate protection on the secondary side also. You usually need to ground that secondary side so it doesn't float to an undefined value.
Keith Cress
kcress - http://www.flaminsystems.com
RE: GFCI receptacle question
What's the "isolation" transformer and how is it wired. Maybe, maybe not. Another question for the ultimate protection answer of "it depends".
RE: GFCI receptacle question
A ground fault on the secondary of an isolation transformer will not affect the balance of the primary currents.
In large protection schemes there may be unintended interaction or lack of protection with multiple grounds and poor design.
In large systems ground fault protection may be provided by monitoring the current (or lack of current) in the neutral to ground link rather than monitoring the residual current. David and I have both encountered systems where ground fault protection has been compromised by poor design. The improper addition/design of a standby generator may cause ground fault protection issues.
It depends.
With a receptacle on an isolation transformer wired according to code there is not much wiggle room.
If the installation is not to code then it depends.
Bill
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"Why not the best?"
Jimmy Carter
RE: GFCI receptacle question
RE: GFCI receptacle question
RE: GFCI receptacle question