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Matt_Colie

Southeast Michigan

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Posted: 05/01/20 08:16am Link  |  Quote  |  Print  |  Notify Moderator

CMT511,

Thank You for the update and confirmation.
Often when diagnoses are suggested, the op just evaporates and we never know if we were understood and if there was success.

Matt


Matt & Mary Colie
A sailor, his bride and their black dogs going to see some dry places that have Geocaches in a coach made the year we married.


road-runner

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Posted: 05/01/20 10:34am Link  |  Quote  |  Print  |  Notify Moderator

DrewE wrote:


Grounded neutral detection has been part of the UL specification for GFCIs since at least the 1993 edition of the spec, possibly longer. It is not a new thing at all.
What's really frustrating is it's still difficult to find a "How GFCIs work" article on the Internet that includes the grounded neutral detection. If you're trying to debate somebody who doesn't think it's true, they can find at least 10 incorrect articles that omit the neutral detection for every one you find that's correct.


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road-runner

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Posted: 05/01/20 10:35am Link  |  Quote  |  Print  |  Notify Moderator

duplicate deleted

enblethen

Moses Lake, WA

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Posted: 05/01/20 12:04pm Link  |  Quote  |  Print  |  Notify Moderator

This is from Mike Holt forum


Bud
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road-runner

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Posted: 05/01/20 03:54pm Link  |  Quote  |  Print  |  Notify Moderator

enblethen wrote:

This is from Mike Holt forum
And as is so typical, the first response is yet another incorrect one, by a moderator/staff member no less. Trying to convince people that GFCIs do zero-current neutral-ground detection is an uphill climb.

The 2006 edition of UL943 includes a test for neutral-ground detection, so the requirement goes back at least that far. See section 6.7.1.2 http://www.3c-test.com/de/?m=Type&a=download&id=189

This article explains how one implementation works. The short version is that a neutral-ground fault results in the sense amplifier oscillating. https://www.powerelectronictips.com/tear........eviton-ground-fault-circuit-interrupter/

vermilye

Oswego, NY, USA

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Posted: 05/01/20 03:58pm Link  |  Quote  |  Print  |  Notify Moderator

There is a video in one off there posts in the link Bud posted that has a good explanation of how GFCIs work. Around 3:30 - 3:40 minutes into the video they explain the ground/neutral fault detection circuitry.

GFCI Video


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