I read in !emc-pstc that [email protected] wrote (in
<[email protected]>) about 'Compliance
After Repairs in the Field', on Tue, 5 Feb 2002:
>We are a manufacturer of Laboratory Equipment. We evaluate our products to
>UL 3101-1, CSA 1010.0 and EN 61010. When we repair a product in the field,
>which may include replacing power supplies, line filters, etc., what
>obligations do we have to verify continuing compliance with the safety
>specifications we originally evaluated our products against? Do we need to
>perform applicable safety testing following these repairs?
Your repair technicians should have been trained to know WHEN a new
safety test is required after a repair. Basically, if a safety-critical
component (except a fuse) has been replaced or removed and replaced, a
new test is necessary. This normally comprises:
-internal visual inspection of position and securing of wiring, damaged
or overheated components, missing fasteners, contamination of
insulation;
- external visual inspection of enclosure fixings, labelling, mains lead
and connectors, other cables if safety is involved;
- earth/ground continuity test at specified current (Class I products);
- insulation resistance at specified voltage;
- leakage current (if required by the safety standard) at specified
voltage;
- dielectric strength test; ONLY if a safety-critical component that is
stressed by this test has been replaced.
The dielectric strength test ('hi-pot') must not be applied
unnecessarily because repeated applications can degrade insulation and
result in failure in service.
--
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
After swimming across the Hellespont, I felt like a Hero.
PLEASE do NOT copy news posts to me by E-MAIL!
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