"Ignoramus19860" wrote in message
...
On Mon, 23 Jan 2006 13:22:51 GMT, Ecnerwal
wrote:
In article ,
Ignoramus5470 wrote:

I also measured temperature on the outside of the housing. In the
hottest point, the temperature is 94 degrees Celsius.

...and what is the insulation temperature rating for the wires inside
this enclosure?


The hottest temperature of 94 degree was not registered anywhere near
the wires.

The "shelf" that separates the wires from the heater is much cooler, I
forgot the numbers but it is perhaps 40 degrees C or so. There is a
second fan that pushes air through the electrical wiring part of this
heater, to keep it cool.

i

Maybe I missed it somewhere, but what happens if it is unattended and either
fan fails or a piece of something jams a fan or blocks the airflow? You
might want to incorporate some sort of safety overtemperature shutdown.
Think furnace or dryer safety thermostatic switch.

Looks like a pretty neat and practical project.

Don Young