Agreed on both counts!
John Allen
Sent from my Fonepad
"Brown,William" wrote:
>A locked rotor test is considered an abnormal and measured temperatures are allowed to exceed the limits for normal operation. If that happens, then it proves a minimal amount of airflow is required to maintain safe temperatures and minimal CFMs become required.
>
>That said, I've never seen a CPU fan be the make or break for safe temperatures (except maybe a laptop). It is likely you have a (written or unwritten) standard operating procedure that states what must be called out for fans and an engineer that is either unwilling or unable to justify removing the requirement.
>
>After all, it is hard to find a regulatory engineer that can do both.
>
>-Will
>
>William L Brown Jr. / Engineering Manager - Regulatory and Compliance / Tyco Security Products
>Tel: +1 978 577 4205 / Mobile: +1 978 727 7069
>
>6 Technology Park Drive / Westford, MA 01886 / USA
>
[email protected] / www.tycosecurityproducts.com/SocialMedia.aspx / www.tycosecurityproducts.com
>
>
>Access Control, Video, Location-Based Tracking and Intrusion. UNIFIED.
>
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>
>-----Original Message-----
>From: McBurney, Ian [mailto:
[email protected]]
>Sent: Friday, December 13, 2013 8:55 AM
>To:
[email protected]
>Subject: Re: [PSES] Cooling fan safety query
>
>John;
>
>I agree the airflow rates will vary with applied voltage and blade profile but if the product continues to function "safely" with a stalled rotor why does it have to be listed in the critical component list.
>
>Regards;
>
>Ian McBurney
>Design & Compliance Engineer.
>
>Allen & Heath Ltd.
>Kernick Industrial Estate,
>Penryn, Cornwall. TR10 9LU. UK
>T: 01326 372070
>E:
[email protected]
>
>
>
>-----Original Message-----
>From: John Allen [mailto:
[email protected]]
>Sent: 13 December 2013 13:31
>To: McBurney, Ian;
[email protected]
>Subject: RE: [PSES] Cooling fan safety query
>
>Ian
>
>I think the critical factor may be the airflow rates at the reduced voltages as this may well vary between various ostensibly similar fans of the same nominal voltage.
>
>The actual airflow patterns from the outputs of the various fans may also differ due to differing blade profiles, etc.
>
>Regards
>
>John Allen
>Compliance with Experience
>W.London. UK
>
>-----Original Message-----
>From: McBurney, Ian [mailto:
[email protected]]
>Sent: 13 December 2013 11:05
>To:
[email protected]
>Subject: Re: [PSES] Cooling fan safety query
>
>John;
>
>I believe the fans are listed for the flammability of the plastic body but I may be wrong.
>
>Ian McBurney
>Design & Compliance Engineer.
>
>Allen & Heath Ltd.
>Kernick Industrial Estate,
>Penryn, Cornwall. TR10 9LU. UK
>T: 01326 372070
>E:
[email protected]
>
>
>-----Original Message-----
>From: John Woodgate [mailto:
[email protected]]
>Sent: 13 December 2013 10:34
>To:
[email protected]
>Subject: Re: [PSES] Cooling fan safety query
>
>In message
><80f690de07894e049b221728b4a99...@dbxpr07mb206.eurprd07.prod.outlook.com>
>, dated Fri, 13 Dec 2013, "McBurney, Ian"
>writes:
>
>>We have to use alternative fans due to supply issues and this incurs
>>considerable test agency costs as the agency won?t accept a
>>manufacturers range of fans without testing each one.
>
>On what grounds are they re-testing when the fans are UL-listed?
>--
>OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk Nondum ex silvis sumus John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
>
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