View Single Post
  #33   Report Post  
Posted to sci.electronics.repair
Radiosrfun Radiosrfun is offline
external usenet poster
 
Posts: 136
Default Electric dryer - thermal fuse question

"Sam Goldwasser" wrote in message
...
"William Sommerwerck" writes:

"Rick" wrote in message
...
William Sommerwerck wrote:
"Rick" wrote in message
...



Set the meter to AC 750V range. Closed the breaker. Tested
black to neutral: no reading. Tested red to neutral: In a split
second "FFFZZZZ!" and the wire inside the insulated test lead
fried and shot out of the test probe.


Non-sequitur. It sounds as if you had the probes inserted in the
current
jacks.



Nope. I checked it twice before testing. And since it was brought up I
looked at the meter again - correct jacks.


Your reasoning wouldn't explain why it didn't 'zap' when testing the
first 120v side of the 240v receptacle. I got no reading at all on the
white and black side. (No fried test lead either.) It went 'zap' when I
tested the white and red side.


But black to neutral might be little or no voltage. Maybe.


Huh?

Black-white should be 115 VAC
Red-white should be 115 VAC
Black-red should be 230 VAC

White-green or white to bare may be near 0 VAC

Assuming it wired with proper color code.

If white-black was 0 V, then there is a problem. But sounds more like
the meter was on the wrong range, connected wrong, or broken.

Regardless, voltage ranges have extremely high impedances. It should be
"impossible" to pump enough current through them to blow up the wiring.


Yep, something is fishy....

--- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: Anything sent to the email address in the message header above
is
ignored unless my full name AND either lasers or electronics is included
in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.


I personally don't mind checking voltages and so on - "always" double
checking meter settings before hand - even if doing a "radio" or some other
appliance. Going with what Sam mentioned - "Assuming" the wiring is to
proper color code. There are a lot of wannabe Electricians out there - who
don't know their butt hole from a hole in the ground. I can also wonder
about some so-called "electricians". WHY? I've known of at least a dozen
so-called "electrical fires" - occurring not too long after the building was
"re-wired". Obviously - someone must have goofed.

This thread - due to "wiring issues" in the "box" - is starting to mirror
the one about someone's TV set damaged by "alleged" faulty wiring.

I knew a "Mill" Electrician at one time. He had a weird way of wiring
things - and most anyone who knew him would say that. I seen a sample of
"Switch box" wiring he did once for a PA system. Man, what a rats nest. How
it worked is beyond me - but it did. I'm glad I wasn't the one who had to
replace it all - when it was done. The best thing there - would have been to
take it all out and start fresh.