Paul,
I know that EN60950 specifies that the minimum flamability requirement for
plastic 'decorative covers' external to the fire enclosure is HB, and I am sure
that UL1950 requirements are the same.
The relevant section of the standard is section 4.4.4 and this reads as follows:
'Mechanical enclosures, electrical enclosures, and parts of enclosures, if
located externally to fire enclosures, and decorative parts shall be shall be of
flamability class HB or better'
The section then goes on to discuss exemptions for small components that would
supply negligable fuel to a fire. The minimum V2 rating is specified for
components within fire enclosures. One important point to note is that often
materials are rated at a certain thickness so you would need to be sure that the
material thickness used would satisfy the HB requirements
Hope this helps,
Duncan
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