9.6 Overcurrent protection
(no text)
9.6.1 General
(uses the word "shall"; not the word "must")
9.6.2 Permanently connected equipment
9.6.3 Other equipment
In context of the Clause, the requirement of 9.6.3 is to
require the overcurrent device, if provided, be a part of
the equipment.
(Once it had set the overcurrent requirements for permanently
connected equipment, 66E had to say something about overcurrent
protection in non-permanently connected equipment.)
Rich
On 11/1/2013 4:43 AM, John Woodgate wrote:
In message <004c01ced6f2$b8ebbd90$2ac338b0$@dk>, dated Fri, 1 Nov
2013, Niels Hougaard <[email protected]> writes:
Thank you for the answer.
It is the word "if" in the beginning of the sentence that to me
indicates that there is the other possibility "if not" as well.
I understand your point, but I think the text is ambiguous and must be
clarified by IEC/CENELEC.
9.6 says an overcurrent protection device 'must' (word not allowed in
an IEC standard to express a requirement; the committee needs to
sharpen up its editing!) be provided.
So 'If' in 9.6.3 appears to contradict the absolute requirement in 9.6.
Incidentally, if there is a 9.6 and a 9.6.3, that is also contrary to
IEC editorial rule banning 'hanging text'.
Edition 1 of 61010-1 (from 1993) had a somewhat clearer wording
stating that there must be an overcurrent protection device in the
equipment, and the changing of the wording could indicate that the
requirements had changed.
The change seems to be deliberate, but I think it is very unsatisfactory.
-
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