Of course a piece of metal is really hot at 70 degrees !
One should keep in mind that safety standards are related to
safety, not to prevent discomfort.
Even when falling onto it, one may rise (and shine) before a serious
burn occurs.
70 degrees C (25+45) is a well established limit
Now, 70 degrees C for external equipment surface that may be
touched
seems pretty high to me. 100 degrees C metal surface will, I believe,
cause
a burn to that part of the human body that touched it.
So maybe my interpretation is not true ??and, can someone point
another
Hello Israel:
Unfortunately, safety standards only address one of the
critical parameters, temperature, when specifying
requirements for protection against a burn injury.
You are absolutely correct that a metal surface with a
temperature exceeding 50 C is capable of producing a burn
Israel,
There are only three temperatures to worry about: Hot, Damn Hot and
Ouch. For something approaching a definition look in BS 4086
Recommendations for Maximum Surface Temperatures of Heated Domestic
Equipment. The other excellent standard for defining the issue is EN
563:1994 Safety of
I have a copy of a standard EN 563:1994, Safety of machinery - Temperatures of
touchable surfaces - Ergonomics data to establish temperature limit values for
hot surfaces. It is only 18 pages but includes charts and graphs of burn
threshold vs contact time for plastic, metal, and ceramic
One possible answer re the hot air issue:
Whatever the surface is (metal grill, plastic vent slots, etc.) that the
hot air is exiting the equipment from, will have to comply with the
external temperature limits already cited. If the air itself is so hot
that there is a burn hazard, those
Hello Israel,
I've not checked your numbers but believe the rationale is, in the case of
Item 1) below: that should one come into contact with a surface at these
temperatures, one will withdraw quickly and no damage is anticipated.
And, in the case of Item 2) below: should one come into contact
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