Hi Brian:
> In EN61010-1 section 10 and EN60950 safety standards, there are surface
> temperature limits specification for Normal Condition based on an Ambient
> Temperature of 40ºC. Our company makes analytical instrumentation and a
new
No, this is not true for IEC 60950.
The temperature limits in IEC 60950 are temperature RISE
limits, not absolute limits.
> product we are working on is functionally very susceptible to room
temperatures.
> So, the operational specification in our manual says it must be in a room
no
> warmer than 30ºC.
If you use IEC 60950, you would place the equipment in a
30 C ambient, and then measure the temperatures of the
parts in question, and then subtract the ambient to get
the temperature rise.
> Question is, is it proper to consider surface temperatures for safety
based on
> a 30ºC ambient which would give us 10º more range to work with?
Someone told
The operating ambient temperature range is a manufacturer's
spec. The safety standard does not tell you what ambient
temperature your equipment must operate in.
> me you could do this but it doesn't seem right to me. You are relying on
the
> building's air conditioning as a level of protection. Then I was told that
if
> the AC broke down it would be considered a Fault and then the 105ºC limit
would
> be applied.
No.
Ambient temperature outside the manufacturer's spec is
not a fault condition. The user's responsibility is to
operate the product within the manufacturer's temperature
spec just as it is the user's responsibility to connect
the equipment to the correct supply voltage.
If the AC broke down, what would be the ambient
temperature? The temperature is indeterminant, so no
meaningful measurements could be made, and, likewise, no
meaningful temperature limits could be set.
Best regards,
Rich
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