Hi Jason. The new AS-3551 will be the subject of a half day workshop at the 
annual SMBE conference in Mudgee from 24 to 27 March. See www.smbensw.org.au 
for details. The workshop will be facilitated by Mr Mike Flood who is one of 
the authors of the standard.
The College of Biomedical Engineering will be putting on a one day AS-3551 
seminar in capital cities around Australia later in the year.
I hope this helps. Bruce.


Sent from my HTC

----- Reply message -----
From: "Jason Chung" <jason...@hotmail.com>
To: <bmelist@bme.asn.au>
Subject: [bmelist] AS3551
Date: Fri, Jan 25, 2013 3:29 pm
Hi all,



The new AS/NZ 3551 has been out for a few months, and I would like
to hear from the biomed community on the interpretation and the implementation
approach.



There are numerous inconsistencies, but the two main points that I
would like to raise here are:



B11.6, Notes (2) - "Most Class
1 electrical equipment has accessible metal parts that are protectively
earthed, in which case the maximum earth leakage current will be dictated by
the allowable value for touch current with the protective earth conductor open,
and not by the limit stated above"



Given that most, if not all, Class 1 equipment has metal parts, the
allowable values of earth leakage current are therefore redundant. All Class 1
equipment will be dictated to comply with earth leakage current same as touch
current of 100μA (no
fault) and 500μA
(single-fault). This is near impossible to achieve even for stand-alone
equipment, not considering any medical electrical system yet.

With protective earth open, measuring touch current is effectively
measuring any current that will flow into the protective earth, if it is intact.





7.3.3 - "When ICT equipment is
integral to, communicate with, and/or controls medical equipment or a medical
electrical system......testing protocols......equally applicable to networked
systems.



The interpretation of 'integral
to, communicate with' means that all network hubs, routers, wireless access
points, electronic medical record server, and everything in a IT server room
will be applicable. Given that most hospitals operate a complex medical network
that are indirectly part of the overall hospital network, the interconnections
and information transfer means that all hospital ICT equipments are covered
within this standard?
Thanks.


Regards,
Jason Chung
PeterMac, Melbourne
  • [bmelist] AS3551 Jason Chung
    • Re: [bmelist] AS3551 bruce.morri...@mysoul.com.au

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