Hi Duncan:
> I have a product that has an LCD display with an Inverter that operates at
> 100Khz 2KV and I believe is capable of supplying 6.5mA The question is does
> it
> require a fire enclosure?
Assuming you are using IEC 60950, a fire enclosure is
required for any circuit exceeding the limits of ELV,
independent of available current or power.
However, you MAY be able to invoke other requirements
to avoid a fire enclosure. Here are some of the "outs:"
Sub-clause 4.4.5.2, third dashed paragraph:
Some interpretations of allow that once a limited
power source has been achieved, ALL circuits down-
stream from that limited power source are treated
as limited power even if the voltage is stepped up
above the limits of limited power.
Sub-clause 4.4.1, method 2.
This allows fault testing in lieu of a fire enclosure.
Most low-power, high voltage inverters are rather
simple circuits; extensive fault testing only involves
a few components, so such testing is feasible and likely
to result in acceptable results.
> If it does what are the requirements for the flamability of the screen and
> any
> plastic protective covers fitted to it.
A fire enclosure requires that the plastic materials be
rated V-1 or better. Note that the fire enclosure need
not be the overall product enclosure (e.g., screen), but
can be an inner part designated as the fire enclosure for
the inverter circuit.
Best regards,
Rich
-------------------------------------------------------------
Richard Nute Product Safety Engineer
Hewlett-Packard Company Product Regulations Group
AiO Division Tel : +1 858 655 3329
16399 West Bernardo Drive FAX : +1 858 655 4979
San Diego, California 92127 e-mail: [email protected]
-------------------------------------------------------------
---------
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to [email protected]
with the single line: "unsubscribe emc-pstc" (without the
quotes). For help, send mail to [email protected],
[email protected], [email protected], or
[email protected] (the list administrators).
