Humming Fuse

[alfiesauce]

access to an infrared camera might be useful too.

 

[mxslick]

You are not suggesting putting your ear on a paper towel roll and putting it on a live 450A fuse are you? I would be hesitant even to open the cover.

I've heard that noise can turn into arc flash pretty quick. It's like "What's that noi......"

Been there, done that. A dry transformer at a cinema I used to service went into destructo mode in exactly that way..started off with a louder-than-usual humming, that progressed to a loud rasping buzz, then a huge flash and a lot of smoke and flame.

Not fun.

 

[wptski]

You are comparing apples to oranges. You want a FOP calculator? Try Ohms Law.

There you go substituting words again! This is "FOP" vs "Voltage Drop" or proper word using of.

Not sure who coined "FOP" but there just isn't any other reference to where it's used except soil resistance testing. I'd guess that a simple voltage drop test goes back farther in time than a Fall of Potential Test does.

 

[roger]

There you go substituting words again! This is "FOP" vs "Voltage Drop" or proper word using of.

Not sure who coined "FOP" but there just isn't any other reference to where it's used except soil resistance testing. I'd guess that a simple voltage drop test goes back farther in time than a Fall of Potential Test does.

Whatever happened to thinking out side of something said in a book?

Roger

 

[zog]

There you go substituting words again! This is "FOP" vs "Voltage Drop" or proper word using of.

Not sure who coined "FOP" but there just isn't any other reference to where it's used except soil resistance testing. I'd guess that a simple voltage drop test goes back farther in time than a Fall of Potential Test does.

Right, but it means the same thing and there is nothing wrong with the term.

Potential=Voltage
Drop=Fall

What is your problem with that?

And why am I defending you marc? Come on step up.

 

[mxslick]

Whatever happened to thinking out side of something said in a book?

Roger

Well put.

That is a common malady in my business..many folks are so used to traditional cinemas that a screening room throws them off.

As for the others having issues with terminology: Chill out, guys. It's just a discussion on a forum..why does it have to break into a catfight?

We all come from different backgrounds and experiences, both personally and professionally. Accept that and move on.

Read what's written here with an open mind, and take the words in context, not what words are said.

 

[mdshunk]

And why am I defending you marc? Come on step up.

Beats me. Maybe you secretly like me? Sounds like the other guy has his mind made up, so there's not much point in beating my head against the wall with him.

Two point, three point, and four point FOP tests are each useful for different things. A two point is great for disconnects, breakers, and contactors. It matters very little to me what you call the test, as long as the person doing it has an understanding on how to conduct it.

 

[augie47]

o.k., 27 posts and nobody has asked..... unbelievable...:grin:
what tune is it humming ?

 

[wptski]

Well put.

That is a common malady in my business..many folks are so used to traditional cinemas that a screening room throws them off.

As for the others having issues with terminology: Chill out, guys. It's just a discussion on a forum..why does it have to break into a catfight?

We all come from different backgrounds and experiences, both personally and professionally. Accept that and move on.

Read what's written here with an open mind, and take the words in context, not what words are said.

I've seen other times here where the use of terms is brought up, so I'm mentioning it. FOP been used by others before and I wonder why are they using that term instead of the common term "voltage drop".

 

[mxslick]

Cool Bill, that explains a lot. I can see where the confusion is coming from.

I think the difference is that while FOP and voltage drop can in one context be used to describe the same thing, i.e. a "fall of potential" can be described as a voltage drop, and a voltage drop can be described a a "fall of potential."

In my own experience, the usage would be as follows:

"Fall of Potential" describes the test method, i.e. reading the voltage across a fuse as in this case, or between the line and load sides of a circuit breaker.

"Voltage drop" would be the value, in volts, of difference between the reading at "point A" and "point B".

All a matter of experiences aand who is describing the event.

o.k., 27 posts and nobody has asked..... unbelievable...
what tune is it humming ?

"Ready To Explode" by that acid rock band ..never mind this is a family forum.

 

[zog]

o.k., 27 posts and nobody has asked..... unbelievable...:grin:
what tune is it humming ?

That joke was banned here a long time ago, check the forum rules regarding humming transformers and forgetting the words, it is in there.

 

[wptski]

Cool Bill, that explains a lot. I can see where the confusion is coming from.

I think the difference is that while FOP and voltage drop can in one context be used to describe the same thing, i.e. a "fall of potential" can be described as a voltage drop, and a voltage drop can be described a a "fall of potential."

In my own experience, the usage would be as follows:

"Fall of Potential" describes the test method, i.e. reading the voltage across a fuse as in this case, or between the line and load sides of a circuit breaker.

"Voltage drop" would be the value, in volts, of difference between the reading at "point A" and "point B".

All a matter of experiences aand who is describing the event.



"Ready To Explode" by that acid rock band ..never mind this is a family forum.

FOP method is a induced current flow to find a unknown resistance like a Wheatstone bridge or 3/4 point soil resistance testing. If you do a search on "FOP", you'll find where it's commonly used and it's not in this situation.