Two Question on Fuses 3

[qa13]

I have had these two questions purposed to me. I have very little back in electricty and hoping that this form can give me an answer.

1. One lead of a volmeter is connected to one side of a fuse and the other lead to the other side of the fuse. What is the significance of a 120V reading?

2. If a voltmeter is used to measure the voltages between the load sides of three fuses in a three phase electronic motor controller and the readings all are aprox. 480V AC, what can we say about the three fuses?

Thanks for the help

Mike

 

[bklauba]

Boy, this sounds like homework.

BK

 

[Compositepro]

Give the guy a break, he's a mechanical asking an electrical question.
If you are reading a voltage across a fuse the fuse is open (bad).
As for question 2 I'm not sure. It depends what your load is. You would still read a voltage even with a blown fuse.

 

[sands]

Compositepro nailed it.

 

[bklauba]

Addressing Q2: If the fuses were blown, you would not get 480 across the LOAD side of the fuses, only the line side, assuming the load side is isolated. So, if you see your service voltage on BOTH sides of the fuses, they should be good.

BK

 

[qa13]

Thanks for helping me this

 

[rbulsara]

Sounded and smelled like a home work, too correctly contstructed electrical question for someone who does not know that basic electrical!

qa13: Consider yourself lucky for not gettnig red flagged yet.

 

[ScottyUK]

Wow, we berate electrical guys who can't string a half-decent question together and we berate non-electrical guys who can! We are a tough bunch to please sometimes.


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If we learn from our mistakes I'm getting a great education!

 

[bklauba]

rbulsara,

I am not sure we can tell who you are rattling the saber at, when your wording is:

"Sounded and smelled like a home work" (question?)

and then . . . .

"too correctly contstructed electrical question" Does the "too" mean also, if so, what does this mean? If it was "to", then I still am not certain what you mean. If "two", OK, but try to spell things right, before you start threatening. It has more style.

BK

 

[ScottyUK]

bklauba,

There's a third interpretation which might be substituted with 'suspiciously well' in the sense of the phrase used, meaning 'too correct' to be believable. That was how I interpreted the comment.


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If we learn from our mistakes I'm getting a great education!

 

[rbulsara]

bk:
I was agreeing with you!!! May be its too good for you to be true!!

Cheers!