From: rjs [ mailto:appro...@minn.net]
Sent: Thursday, October 13, 2005 4:10 PM
To: Robert A. Macy
Cc: gd...@ncht.trent.nhs.uk; emc-p...@ieee.org
Subject: Re: 60601-1 and patient leakage current
Does anyone have
Does anyone have measurements of the medical effects of power-line-frequency
current flowing in humans? Many years ago the IEEE Power Engineering Society
published data where the threshold was 200 milliamperes in power-line workers.
Thank you
Bob Schlentz
appro...@minn.net
Robert A. Macy wrote:
>From personal experience, 0.1mA is wa-a-a-ay too high!
Make it more like 10 uA
- Robert -
On Tue, 11 Oct 2005 18:03:19 +0100
gd...@ncht.trent.nhs.uk wrote:
> With regard to whether Doug should be measuring Patient
> Leakage from his
> bedframe:-
>
> I believe the bedframe is a
Doug,
Have you checked out IEC 60601-2-38, Particular Requirements for the Safety
of Electrically Operated Hospital Beds.
This standard may clarify how you measure earth leakage current and patient
leakage current for a hospital bed. (I don't have a copy of this standard,
so I'm guessing).
IEC
Doug,
60601-1 is not the easiest standard to interpret, but I think that in this
instance you are interpreting it incorrectly. Patient leakage current is
that current which flows between an Applied Part and Earth via the patient.
The accessible parts of the frame are not considered as Applied Part
Doug,
Altho I am not completely familiar with 60601-1 since I haven't
worked with it for a number of years, I will comment on leakage current
requirements for earthed equipment in general.
By and large it is recognized that earth/ground is unreliable for
cord connected equipment around
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