mbrooke
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:huh::blink:
GFCI vs RCD trip threshold-why?
- Thread starter mbrooke
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:huh::blink:
peter d
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Apparently so. :roll:
FionaZuppa
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- Part Time Electrician (semi retired, old) - EE retired.
a 3mA one would be even better, yes??
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- Massachusetts
FionaZuppa
Senior Member
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- AZ
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- Part Time Electrician (semi retired, old) - EE retired.
yeah, and if the world doesnt get hit by a killer asteroid then everyone has to work tomorrow.
3mA GFCI would work just fine, so why hasnt NEC demanded that 3mA be the # ??
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Put in a proposal, you have all the answers so I am sure the NFPA will listen to you.
mbrooke
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This is veering off, but its comments like this I personally would not approve of if I was a mod. I think its obvious (IMHO) that FionaZuppa is an engineering student learning this stuff for the first time and as such his knowledge/interpretation will be fragmented. The only clown question is one not asked :thumbsup:
3ma would be safer, but I think it boils down to nuisance tripping.
Consider that 30ma RCDs often protect about 3 to 10 circuit in most parts of the world while RCD mains are often in the 100ma to 500ma range. It is often a balance between providing protection vs holding on normal operation.
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I really don't care what position Fiona holds.
Based on Fionas comments on a variety of subjects from grounding electrodes to GFCIs to the NFL I believe Fiona is trolling.
My opinion, you don't have to agree.
mbrooke
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Maybe, but its always best to give a student a chance (in the event that he is).
FWIW the more I research the more I think that the 30ma threshold might have more to do with serving multiple circuits. Doesn't Square D restrict GFCIs to 100 feet of conductor or less?
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For what RCDs? Does it matter? It is what it is.
I have heard 200' for Leviton but have never seen it in print from any maker.
Personally I prefer point of use GFCI protection .... oh wait you know that.
mbrooke
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Those used outside of North America. I think the 30ma set point might be because more circuits are protected, at least that is my theory.
I have heard 200' for Leviton but have never seen it in print from any maker.
Personally I prefer point of use GFCI protection .... oh wait you know that.
I prefer point of use as well, at least having each circuit with its own GFCI. The submain approach while elegant needs a higher value to prevent nuisance tripping. Think GFP on a 1000 amp 277/480 volt main. 100ma would probably be ideal, but normal leakage currents necessitate at least few amps pickup.
FionaZuppa
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- AZ
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- Part Time Electrician (semi retired, old) - EE retired.
so now i will ask here in this forum, wtf are you talking about, "NFL"? you mean that i replied to the "NFL" thread in Campfire Chat ?? and your point is what exactly?
i'll let you put on some glasses and take some reading time to go back and read all of my posts on MH as i already stated my background, which is well above most here on MH! if you want to discuss NEC article by article then start a thread, i have many items that just dont make sense.
FionaZuppa
Senior Member
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- AZ
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- Part Time Electrician (semi retired, old) - EE retired.
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