Hi Rich,
The symbol you mentioned (IEC60417 No. 5020 - with the "rakes"), as well as
5017, 5018, 5021, 5173 are used to identify (and/or) frame/chassis/ground.
The problem is that in our product, the terminal for return (0V) wires of
redundant DC POWER sources, has no connection to either of them. I am
afraid that due to similarities to the 5173, the upside-down letter T may
also be understood as indicating some kind of connection to
frame/chassis/ground. What symbol should be used? 0V?
Best Regards,
John
Rich Nute
<[email protected]> To:
[email protected]
Sent by: cc:
[email protected], [email protected], [email protected]
owner-emc-pstc@majordo Subject: Re: Symbol
mo.ieee.org
05/06/2004 11:21 AM
Please respond to Rich
Nute
Hi John:
> The symbol I mentioned in my original question looks similar to the
5173
> but it is not identical (see below).
>
> |
> |
> -----
>
> My question is: can this symbol be used for marking of a terminal to
which
> return (0V) wires of redundant DC POWER sources are connected? If not,
what
> symbol would you use? 0V?
My recollection is that, many years ago, HP
invented this mark for their Test and
Measurement equipment because they had no
space for the "rakes" below the horizontal
line:
|
|
-----
/ / /
The meaning was the same: the terminal is
connected to the chassis and accessible
metal parts.
HP did attempt to get the symbol into the
international symbol standard, IEC 479. And,
according to Doug Powell's message, I guess
they were successful.
(I was not with HP at the time, although I
was well-acquainted with their safety folks,
and we worked together on safety standards
committees.)
Best regards,
Rich
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For help, send mail to the list administrators:
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