RE: Circuit Breaker Tripping Dring Fault Tests

[Kurt Mikolajewski]

Jim
 
I your case the required BASIC INSULATION is not present or adequate. BASIC
INSULATION provides a level of protection. The branch circuit provides an
additional level of protection if there is a failure of the BASIC INSULATION.
The standard in this instance allows the designer to provide an alternate
protection method to replace the BASIC INSULATION, with the requirement that
it fails safe and it does not impact any other insulation system. 
 
Regards,
Kurt Mikolajewski


From: Jim Eichner [mailto:jim.eich...@xantrex.com]
Sent: Tuesday, January 28, 2003 5:13 PM
To: emc-p...@majordomo.ieee.org
Subject: RE: Circuit Breaker Tripping Dring Fault Tests


I've been trying to solve this one myself.  I work with one pair of standards
(UL458 / CSA107.1) where they specifically say that opening the branch circuit
protection is acceptable during component fault testing, but NOT during short
circuit tests done for the purposes of validating inadequate trace spacings
(an easement offered in the standards in some situations).  I've always been
puzzled why we can't rely on branch circuit protection for both situations,
but neither agency has been able to explain the difference to me.
 
Jim Eichner, P.Eng.
Regulatory Compliance Manager
Xantrex Technology Inc.
phone: (604) 422-2546
fax: (604) 420-1591
e-mail: jim.eich...@xantrex.com
web: www.xantrex.com 
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RE: Air Flow Meters

[Kurt Mikolajewski]

Joe,

One product I have found that uses wire probes is the ATM-24 from Cambridge
AccuSence, Inc.

Regards,

Kurt Mikolajewski
Catena Networks
Voice:  (613) 599-6430,  x8551
Voice  (Internal):  8551
Email: kmiko...@catena.com


-Original Message-
From: Joe Finlayson [mailto:jfinlay...@telica.com]
Sent: Friday, February 23, 2001 4:03 PM
To: 'EMC PSTC'; 'NEBS Newsgroup'
Subject: RE: Air Flow Meters




OK, thanks for all the replies.  It appears I am in search of a Hot
Wire Anemometer.  I've found several on the web, but all seem to use a
telescoping probe for measurement, probably for air ducts.  Does anyone know
of a model that uses a wire for measurement so I can affix it to a modular
plug in card, thus sealing the chassis.  My goal is to measure air flow
rates in each of 21 slots while the cards are installed (thus sealing the
chassis for realistic air flow).

Thx,


Joe

>  -Original Message-
> From: Joe Finlayson  
> Sent: Friday, February 23, 2001 8:41 AM
> To:   'EMC PSTC'; 'NEBS Newsgroup'
> Subject:  Air Flow Meters
> 
> 
>   I'm interested in doing an air flow analysis on a per-slot basis for
> a modular chassis.  Can anyone share their experience in using their
> favorite test tools for this function.  One of my colleagues had mentioned
> that he recalls the use of a thermocouple-type lead that was used at his
> previous place of employment that measured air flow.  Any knowledge of
> this type of product would be greatly appreciated as well.
> 
> Thx,
> 
> 
> Joe
> 
> *
>  << OLE Object: Picture (Metafile) >> 
> 
> Joe Finlayson
> Manager, Compliance Engineering
> Telica, Inc.
> 734 Forest Street, Bldg. G, Suite 100
> Marlboro, MA 01752
> Tel:  (508) 804-8212
> Fax:  (508) 480-0922
> Email:jfinlay...@telica.com
> Web:  www.telica.com
> 

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