Hi Paul:
> Can anyone give me any information on whether a box with less than .33 cubic
> feet needs to meet UL Flammability ratings?
> I have been told this is true, but I can not find the location of that
> information.
I believe the requirement you are referring to is
Sub-clause 4.3.3, UL1950/IEC 60950
Sub-clause 4.7.3.3, UL 60950-1/IEC 60950-1
This requirement exempts materials and components within
an enclosure of 0.06 m^3 from flammablity requirements.
The enclosure itself must be of metal and must have no
ventilation openings.
However,
0.06 m^3 = 2.12 ft^3
0.33 ft^3 = 0.01 m^3
so the volume you quote does not agree with the volume
in the requirement.
With this exception, and as far as I know, requirements
for material flammability ratings are based on the circuit
parameters, not on volume of the box.
Best regards,
Rich
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