The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
breaker meltdown
by sparky
Yesterday at 07:30 PM
230 or 345 kV transmission lines?
by Vlado
09/24/16 09:33 AM
Electrical mast flashing product
by ThomasWinfrey
09/22/16 12:14 AM
What estimating software do you recommend?
by sparky
09/21/16 07:20 PM
"Dry Run" Inspection goes awry
by HotLine1
09/20/16 07:39 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
HotLine1 13
sparky 10
gfretwell 8
sparky66wv 8
Vlado 6
Who's Online
0 registered (), 254 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#183467 - 01/10/09 08:42 AM Switchgear / GFP test
luckyshadow Offline
Member

Registered: 01/04/05
Posts: 305
Loc: 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)


Edited by luckyshadow (01/10/09 08:43 AM)

Top
2014 / 2011 NEC & Related Books and Study Guides
#183484 - 01/10/09 09:33 PM Re: Switchgear / GFP test [Re: luckyshadow]
George Little Offline
Member

Registered: 01/18/04
Posts: 1492
Loc: 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

Top
#183696 - 01/19/09 02:01 PM Re: Switchgear / GFP test [Re: George Little]
Brian_John Offline
New Member

Registered: 05/14/07
Posts: 7
Loc: 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.


Edited by Brian_John (01/19/09 02:02 PM)

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals