Hi Jim:
IEC 62368-1 contradicts itself.
In 8.5.2, the standard specifies two symbols (for moving pats).
In F.5.2, the standard references graphical symbol standards, and gives the
option of designing a specific symbol.
So, the question is: Which sub-clause takes precedence?
Clause 8 was written by an ad hoc group. Annex F was written by another ad
hoc group. The two groups did not review each other's work, and the editing
committee did not thoroughly review the two clauses. If all had done a
thorough job, we would not have this contradiction. (Such contradiction is
not unique to 62368 but can be found in other IEC safety standards.)
Regardless of the contradiction, keep your customer in mind, and choose a
symbol that will clearly warn your customer.
Good luck. Stay safe. Best regards,
Rich
From: Jim Hulbert <[email protected]>
Sent: Thursday, June 25, 2020 12:31 PM
To: [email protected]
Subject: [PSES] EN/IEC 62368-1 Instructional Safeguards
EMC-PSTC group,
This question is in regard to EN/IEC 62368-1 instructional safeguards. In
section 8.5.2, instructional safeguard requirements for moving parts, the
symbol for element 1a "shall be" IEC60417-6056 for moving fan blades and IEC
60417-6057 for other moving parts. Suppose the moving part is something
like a rubber belt and these symbols do not convey that?
Now if I look at the standard Clause F.5 for instructional safeguards, it
describes element 1a in Table F.1 more generally as a symbol that identifies
the nature of the class 2 or class 3 energy source and the consequences that
can be caused by the energy source. It further states that symbols for
element 1a shall be from IEC 60417, ISO 3864-2, ISO 7000, ISO 7010 or the
equivalent.
My question then, is it permissible to select a symbol from the IEC/ISO
standards, other than the symbols specified in section 8.5.2, that clearly
the identifies the nature of the moving part or energy source? In other
words can I ignore the "shall be" part of 8.5.2 and select a more
appropriate symbol from the IEC/ISO standards? This same question applies
to instructional safeguards for other energy sources, as well.
Thank you.
Jim Hulbert
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