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Hot Surface Warning

Hot Surface Warning

Hot Surface Warning

(OP)
Hi,

I would like to ask what is the threshold surface temperature of electrical devices from which the application of "HOT SURFACE" warning sticker is mandatory and which standard(s) could be applied ?

RE: Hot Surface Warning

You might see if you can get a look at: BS EN 563 Safety of machinery – Temperatures of touchable surfaces – Ergonomics data to establish temperature limit values for hot surfaces

It is likely defined in a standard applicable to wherever you are - without that information it's difficult to help.
  

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

RE: Hot Surface Warning

(OP)
Thanks Scotty for your entry. I would rather be interested in PDU and switchgear's cabinets used in the power distribution like in machinery, but I will try to have a look on machinery standard.

Basically, I would like to know when is the usage of the following sign type mandatory : http://www.speedysigns.com/decals/WARNING_Hot_Surface_Do_Not_Touch.asp

RE: Hot Surface Warning

It varies depending on size, shape and surface texture of the item in question.
As a general rule of thumb, we put the warning label on any equipment that may reach above above 60 degC.  VFD heatsinks for instance.
Matt

RE: Hot Surface Warning

(OP)
Matthewm1965, thank you for the hint.

RE: Hot Surface Warning

I think the maximum allowable surface temperature that will produce burns to skin when in contact with said hot surface is 43o Centigrade. Most hospitals and nursing care institutions require putting up warning labels "WARNING, VERY HOT".

Suggest you try NIMA website for details -National Insulation Manufacturers Association.

Also, temperatures over 80o Centigrade can cause 2nd degree burns (definition of arcflash protection boundary to limit burns to a curable 2nd degree burn, temp >80o)
Hope this helps

RE: Hot Surface Warning

The 43°C limit is for vulnerable or infirm persons who may become 'permanently' in contact with the hot surface through inability to remove themselves from it. I am pretty sure the limits are higher where those exposed to the hazard are not reasonably expected to be infirm or vulnerable.
  

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

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