This is my "Friday Question":
"What exactly is the point of IEC 61010-1:2010 section 6.7.1.4?"
It mentions "requirements" depend on factors in 6.7.1.1 a) to d), which by
the way is true for all insulation, then provides a four paragraph tutorial
on types of construction, electric strength, gaps, voids,
and cumulative damage. No requirements for construction, examination, or
testing are actually given in this section of the standard.
However, the TRF Rev H does have one requirement for "thickness of
insulation" based on section 6.7.1.1 a) to d) which in turn
describes voltage and overvoltage stresses, and there is a
parenthetical reference to Table K.9.
Table K.9 has very nice table for minimum thickness of molded and potted
parts. Except that Annex K is really about equipment in
extended environments (>2000 meters, O.V. Cat III and IV, etc.).
The Standard and TRF apparently fall back on the old methods taken from IEC
60950 of 0.4 mm minimum thickness for ≤ 300V insulation and expands the
table a bit with two more rows for 300V to 600V and 600V to 1000V.
Additionally, this requirement is apparently for mains only and falls
far short for dealing with high voltage secondaries.
In addition, there are no other guidance or requirements given for the
other concerns mentioned in the tutorial portion of this clause.
I could go to the wealth of information provided to the committee in IEC
60664-1 and IEC 60664-3, but in the interest of time and space I won't do
that now.
--
Thanks, -doug
Douglas E Powell
[email protected]
http://www.linkedin.com/in/dougp01
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