GFCI, Special Purpose Type 26.3
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- เผยแพร่เมื่อ 25 ส.ค. 2024
- Class “A” GFCI devices have been around for so long that we’ve all become pretty familiar with them, but have you ever heard of an “SPGFCI” (special purpose ground-fault circuit interrupter)?
Learn what you need to know by watching the video in which Mike and the team discuss this new special-purpose ground-fault protection device.
This video is extracted from Mike Holt's Understanding Electrical Theory Library www.mikeholt.c.... For additional information call 888.632.2633.
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Pursuant to Brian’s comments and Mikes response at 3:55 the pigtail or plug on neutral is for the power supply to the gfci or afci breakers which powers the microcontroller (computer) analyzing fault conditions on the circuit.
But I don’t quite understand how the 240V GFCI breaker works. A 120 volt GFCI breaker or receptacle compares the current on the ungrounded and grounded conductor and trips over the design threshold. So what does the 240v breaker do compare the current on each ungrounded conductor?
Very good information!
What is the allowable current with objectionable current on the grounding system ?
Good Stuff Mike!
Thanks
Mike, is there any chance you can do a whole video, or something to that effect on just neutrals? Sizing neutrals, linear & Non-linear loads Etc....This would be greatly appreciated, and I would definitely add it to my collection of many of your other books. Thanks Mike!
This is covered in my Exam Prep book. Sorry that's the best I can do.
For a 2 pole breakers with a pigtail, does the GFCI work if pigtail is not connected? Why or why not? The return current can flow on one of the two poles. Thanks.
A two-pole GFCI breaker needs a neutral for the internal circuitry.
@@MikeHoltNEC But there's no neutral going out to the equipment right? Jus two hot wires. Thanks!
If the load doesn't need a neutral, then no load neutral required, but a 'line' neutral is required
@@MikeHoltNEC Thank you. Keep up the good educational content!
Since houses are going to be going all electric.
I could imagine several 240 circuits requiring a few of these in a medium to large size red residence. Are we looking at an extra cost of an extra thousand to $2000 for a handful of these? .
Those circuits are still 120 to ground. It's not line-to-line voltage.
These do not apply to 240vac systems, just line to ground voltage of 150vac or more.
@@thebuildingcodeforum I have to relist to the video on the wording. I know currently it’s only line to line ground 150 voltage.
But in the future and coming up, I thought they were talking about to do the same thing as Europe and Canada does ground fault on 240 V like they do in other countries it’s been mandated and implemented into codes around the world . except the United States were a little lacking behind the times