Commercial Kitchen Eq. Trip gfi

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iwire

iwire

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mdshunk said:
No more than you home refrigerator. Your home refrigerator typically only heats the mullion between the fridge and freezer.
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My home refrigertor is not opened and clsoed a 100 times a day. :)
 
mdshunk

mdshunk

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cschmid said:
If one of them heaters were shorted would that not trip a GFCI..
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Indeed it would. There's a million and one things in a commercial fridge that could get leaky and trip the GFCI, but the compressor is the #1 suspect. Evaporator fan, compressor, defrost timer, door switch, light fixture, drain tube heater, evaporator pan heater, jamb heater, thermostat, the supply cord, or any other associated wiring....
 
iwire

iwire

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cschmid said:
If one of them heaters were shorted would that not trip a GFCI..
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Sure.

If you believe the NEC handbook they claim a lot of GFCI trips by refrigerators are caused by the electric defrost elements. But our man Marc fins a lot of bad compressors.
 
mdshunk

mdshunk

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iwire said:
Sure.

If you believe the NEC handbook they claim a lot of GFCI trips by refrigerators are caused by the electric defrost elements. But our man Marc fins a lot of bad compressors.
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I sure would like to know what the NEC people read that caused them to think that? I know you don't know, but for me it takes about 1 minute to pull the peckerhead connections off a hermetic pot to check and it's almost always been the compressor as the source of the failure.
 
mdshunk

mdshunk

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cschmid said:
Marc do you have a leakage tester like bob pointed out..I am curious how you repair the motors on the refrigeration..
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No, nothing fancy like that. I do have a leakage tester, but it's a Slater model from the 80's that is no longer made. I just do a megger check to look for leakage.

There is no repair for a leaky hermetic motor-compressor. The only fix is replacement of the hermetic pot. Same with any other leaky part, for that matter, unless it's a wiring scuff.
 
cschmid

cschmid

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I have never meggared a hermatic refrigeration motor..I was curious everyone I ever seen go bad has to be replaced..

Edited: Marc you meggar everything from the sounds of it..is there a meggar testing handbook you lerned from or have written..
 
mdshunk

mdshunk

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cschmid said:
Edited: Marc you meggar everything from the sounds of it..is there a meggar testing handbook you lerned from or have written..
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The best one I have found so far has ne'er been talked about on the net. It's from the 1920's, about 100 pages, and really speaks to the run of the mill electrician. I fully intend to scan it in. I wanted to do that this weekend, but haven't had the time so far. It really is a pain in the ass to just write about something in general rather than answering a specific question. I wrote a couple magazine articles once upon a time, and it was a real chore. I really pity anyone who's ever managed to write a whole book on his own.
 
L

Lxnxjxhx

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little faith in sources that can be edited at anytime by anyone

little faith in sources that can be edited at anytime by anyone

Everyone talks about fact checking, nobody says exactly how to do it. After considerable trouble, I found a book called "Unspun: finding facts in a world of disinformation".
Unfortunately, some of our own shortcomings help to misinform us.

Basically, the authors said-

-People use fear to promote their ideas (FUD: fear, uncertainty, doubt) so if it's scary, be wary.
-Watch out for dramatic ideas that match what we want to believe (data in the service of ideology)
-If it's pictures vs. spoken words, pictures win, but seeing is not necessarily believing.
-Average is not typical
-We think in stereotypes, so ask, Is the picture in my head an accurate representation of reality?
-Try to disprove your own idea; What fact could disprove it, what evidence has not been considered?
-The more misinformed we are, the more we are convinced that we are right.
-Ask, Would I feel this way if I were hearing this the first time? Have new facts emerged since I made my initial decision?
-Hearing something often makes us think it happens more often
-Many anecdotes is not data.
-To evaluate a dramatic factual claim, ask : Who stands behind the info, does the source have an ax to grind, by what method was the info obtained, how old is the data, what data collecting assumptions were made, how much guesswork was involved?
-While everyone has a bias, disinterested people are more likely to be trustworthy than advocates.
-Extraordinary claims need extraordinary evidence.
-Even a good study from a reliable source can be wrong.
-Is the source highly regarded and widely accepted?, is the source an advocate?, what is their track record?, what method is used?, does the source show its work?, is the sample random?, is there a control group?, does the source have the necessary skill?, have the results been replicated or contradicted?
-correlation may not mean causality.
-you can't be completely certain, but you can be certain enough; use the standards of evidence: preponderance of evidence, clear and convincing, beyond a reasonable doubt.
-look for general agreement among experts (but consensus is not proof).
-check primary sources.
-crosscheck everything that matters.
 
M. D.

M. D.

Senior Member
Lxnxjxhx said:
Everyone talks about fact checking, nobody says exactly how to do it. After considerable trouble, I found a book called "Unspun: finding facts in a world of disinformation".
Unfortunately, some of our own shortcomings help to misinform us.

Basically, the authors said-

-People use fear to promote their ideas (FUD: fear, uncertainty, doubt) so if it's scary, be wary.
-Watch out for dramatic ideas that match what we want to believe (data in the service of ideology)
-If it's pictures vs. spoken words, pictures win, but seeing is not necessarily believing.
-Average is not typical
-We think in stereotypes, so ask, Is the picture in my head an accurate representation of reality?
-Try to disprove your own idea; What fact could disprove it, what evidence has not been considered?
-The more misinformed we are, the more we are convinced that we are right.
-Ask, Would I feel this way if I were hearing this the first time? Have new facts emerged since I made my initial decision?
-Hearing something often makes us think it happens more often
-Many anecdotes is not data.
-To evaluate a dramatic factual claim, ask : Who stands behind the info, does the source have an ax to grind, by what method was the info obtained, how old is the data, what data collecting assumptions were made, how much guesswork was involved?
-While everyone has a bias, disinterested people are more likely to be trustworthy than advocates.
-Extraordinary claims need extraordinary evidence.
-Even a good study from a reliable source can be wrong.
-Is the source highly regarded and widely accepted?, is the source an advocate?, what is their track record?, what method is used?, does the source show its work?, is the sample random?, is there a control group?, does the source have the necessary skill?, have the results been replicated or contradicted?
-correlation may not mean causality.
-you can't be completely certain, but you can be certain enough; use the standards of evidence: preponderance of evidence, clear and convincing, beyond a reasonable doubt.
-look for general agreement among experts (but consensus is not proof).
-check primary sources.
-crosscheck everything that matters.
Click to expand...

I wish the powers that be applied half this list to AFCI technology
 
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