In message <[email protected]>, dated Mon, 30 May 2011, Scott Douglas <[email protected]> writes:
>They cited 20.2.1 - > >"Requirement: All circuits where the available power exceeds 15 W, and >their associated components, shall be contained in a fire enclosure." > >"Observation: The enclosure construction has openings under the power >supply and amplifier circuitry. Such construction is not considered a >suitable fire enclosure. In order to comply with UL 60065, these bottom >openings must be removed." > >I just realized I was excerpting the UL version of the standard and >their test report says it was done to EN 60065. I don't think it makes >much difference though. It does. The whole of clause 20.2 of EN 60065 is different from what you cited from UL 60065. It might be that the text house has tried to apply both standards in some way. UL 60065: 20.2.1 Each of the following shall be contained in a FIRE ENCLOSURE: (1) circuits and their associated components where the available power exceeds 15 W, (2) inductors and windings CONDUCTIVELY CONNECTED TO THE MAINS, ... 20.2.2 Internal FIRE ENCLOSURES shall not have openings that permit accessibility to components, wiring, connections, or PRINTED BOARD conductive patterns where the AVAILABLE POWER exceeds 15 W and to inductors and windings CONDUCTIVELY CONNECTED TO THE MAINS ... Compliance is checked by inspection and measurement and using the jointed test finger. EN 60065 [parts only] 20.2.1 Potential ignition sources with open-circuit voltages exceeding 4 kV (peak) a.c. or d.c. under normal operating conditions shall be contained in a fire enclosure which shall comply with the flammability category V-1 or better according to IEC 60707. [text about when a fire enclosure is not required, such as that voltages do not exceed 4 kV] 20.2.2 Internal fire enclosures shall not have openings for ventilation exceeding 1 mm in width regardless of length. Openings for connecting wires shall be filled completely by the wires. Compliance is checked by inspection and measurement. Note that in both standards, 20.2.2 refers to *internal* fire enclosures. The enclosure is not an internal fire enclosure! -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK Plural: data, criteria, phenomena. Singular: datum (different meaning: use 'data element' for a single item), criterion, phenomenon. 'Effect' is a noun, 'affect' is a verb (except in psychiatry). - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://product-compliance.oc.ieee.org/ Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
