That's my feeling - it's an illogical exclusion. At most the standard
should disallow the use of any (ie technology neutral) device that has
not been tested to a relevant standard that takes cycle life into
account, but to pick on auto-reset electromechanical devices while
allowing auto-reset solid state devices seems very odd, especially since
the latter are more likely to be damaged by surges and the like.
Any '950 authors lurking who haven't commented yet?
Jim Eichner, P.Eng.
Compliance Engineering Manager
Xantrex Technology Inc.
e-mail: jim.eich...@xantrex.com
web: www.xantrex.com
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From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of John
Woodgate
Sent: Friday, June 20, 2008 5:15 AM
To: emc-p...@ieee.org
Subject: Re: FW: 60950-1:2006 clause 2.5 - Limited power sources
In message
de87437fe365cb458c265ea3d73b6f1d039ad...@xbc-mail1.xantrex.com, dated
Fri, 20 Jun 2008, Jim Eichner jim.eich...@xantrex.com writes:
To be clear, the LPS application would not be a circuit breaker as
the term is commonly used. The language from '950 that I objected to
was regarding automatically resetting overcurrent protective devices,
so rather than a circuit breaker it would be something like a thermal
auto-reset device that I would call a current limiter or a circuit
protector not a breaker. Semantics to some extent, but auto-reset was
the main attribute for this discussion.
Well, if it's not a circuit-breaker (electromechanical, and therefore
reliability is an issue), it makes even less sense to allow PTCs. I
suspect that the ban on auto-reset was lifted for PTCs because if not it
would be an absolute ban on their use. But it's not logical.
--
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
Either we are causing global warming, in which case we may be able to
stop it,
or natural variation is causing it, and we probably can't stop it. You
choose!
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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