Hi Brian:
With respect to IEC 60950-1, 2nd:
1.7.7.1 It is not a requirement to mark terminals for PROTECTIVE BONDING
CONDUCTORS, but where such terminals are marked, the symbol (IEC 60417-5017
(DB:2002-10)) shall be used.
2.6.2 wiring terminals to be used only for FUNCTIONAL EARTHING shall not be
marked by the symbol (60417-IEC-5017)
Since some internal earth wiring comprises protective bonding conductors,
5017 may be used to identify the points of connection, but such marking
is not required.
5017 cannot be used for functional earthing.
With respect to 61010-1, the symbol is simply defined as "earth (ground)
terminal."
I cannot find any reference in either of these standards that specifies
use of the 5017 symbol for functional earth terminals.
Best regards,
Rich
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Kunde,
Brian
Sent: Tuesday, September 22, 2009 11:11 AM
To: [email protected]
Subject: Earth Ground Terminal Symbols
In regards to IEC 60950 and IEC 61010-1, I’m confused about the proper
use
of IEC 60417 symbols 5017 and 5019.
The 5017 symbol (ground symbol without the outer circle) and
The 5019 symbol (with the outer circle).
We know to use the 5019 symbol where the Protective Conductor Terminal
from
the Mains power cord connects to our metal chassis.
But internal to our equipment, what symbol do we use on conductors that
connect primary components such as line filters, power supplies, motors, or
accessible metal parts to the equipment base for safety purposes?
We generally use the 5017 symbol for these applications but the
standard says
to use the 5017 symbol for “Functional Earth Terminals” for purposes
“other than safety”.
Please help me to understand.
The Other Brian
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