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Phil Allison[_2_] Phil Allison[_2_] is offline
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Default Do thermal fuses fail from old age?


"Jeff Liebermann = Nut Case ****wit "

The coffee distillery is double insulated, which means it doesn't need
a ground pin on the power plug. Since a fault can affect either side
of the power line in such a symmertical arrangement, two fuses are
required.


** Horse manure.


Yep.


** Glad you agree- ****wit.


One fuse is sufficient to break the circuit in case of current overload.


http://www.freewebs.com/valvewizard/fuses.html
Some appliances use two fuses, one for live and one for
neutral. While there is some argument against using a
neutral fuse, there is no law against it (in the UK anyway).
You can buy IEC inlet sockets with built-in fuse holders,
which greatly simplifies construction.



** Utterly irrelevant crap.


http://www.appliance411.com/faq/dryerheat.shtml
There are 2 fuses or breakers for the dryer, both must
be good in order for the dryer to function properly.


** That schem shows TWO PHASE power being used.

You ****ing tenth wit.



Thermal fuses act on temperature, not current at all.


True.


** Glad you agree - ****head.


The max current rating given by makers is based on self heating to ensure
the fuse stays within temp rating tolerance.


The max current rating is the maximum current at which it will operate
safely without self-heating and blowing the fuse.



** There is only a few degrees of self heating at the rated current.

So to melt the material inside takes at least 5 times that current.


I found out the
hard way that it's much like the rating on a typical wire fuse. If
you run a 5A fuse, at 5 amps at room temperature, it will eventually
blow.



** Wire fuses run very hot at rated current, the wire inside may bend or
even glow in the dark - ie nothing like thermal fuses.

Same with a thermal fuse.


** Blatant LIE.

If you run it near it's rated
maximum current (usually 5A, 15A, or 30A), it will eventually get warm
enough to melt the wax and trip the fuse.


** MASSIVE BULL**** !!!!!!!!!!


With a short circuit across
the power line, the self-heating will blow the thermal fuse almost
instantly.


** Nope - it will trip the supply breaker.

With a 10 times or more overload, breakers trip in a few milliseconds.

You stupid asshole.


.... Phil