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#183467 - 01/10/09 12:42 PM Switchgear / GFP test  
luckyshadow  Offline
Member
Joined: Jan 2005
Posts: 305
Maryland USA
I'm curious of those that install gear that requires Ground Fault Protection by the NEC - How many of you have the GFP tested after installation? Required by 230.95 C ( 2005 nec)

Last edited by luckyshadow; 01/10/09 12:43 PM.

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#183484 - 01/11/09 01:33 AM Re: Switchgear / GFP test [Re: luckyshadow]  
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
Michigan USA
Absolutely - It's required by the NEC and the manufacturer. I always ask for the engineers spec on where he wants the trip point, I witness the performance test as administered by the company performing the test and then sign the document that goes on record as compliance with 230.95(C).

For the record, pushing the Test button on the equipment is not acceptable as the "Performance Test"

In my career as an inspector (25 years) I have had 2 systems that did not past the first time.


George Little

#183696 - 01/19/09 06:01 PM Re: Switchgear / GFP test [Re: George Little]  
Brian_John  Offline
New Member
Joined: May 2007
Posts: 7
Leesburg, VA
We perform secondary injection testing of GFP systems for ECs and over the years (25-28) I have had countless GFP systems fail the initial test.

We test the GFP relay at all factor presets for current pickup and at a timed operation at the settings recommended in the coordination study (if supplied). We also test (megger) the neutral for any grounds downstream of the main service, megger the bus line and load and ductor/micro-ohm the power contacts. Lastly we recommended leaving the main line switch closed (as do manufactures) during construction till power is to be connected and recommended leaving the GFP relay set at minimum current and time delay for minimizing possible damage to equipment during construction.

Last edited by Brian_John; 01/19/09 06:02 PM.


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