Hi John,
No, I did not. As far as I remember, UL adopts/harmonises IEC standard in last
10-15 years. This requirement appears as early as 20 years ago.
However, I just checked UL 60065 and 60950-1 without the requirement.
Thanks and regards,
Scott
On 2/6/2017, 3:11 AM, "John Woodgate" <jmw1...@btinternet.com> wrote:
Did you look at the UL versions of these standards as well as the IEC
versions?
With best wishes DESIGN IT IN! OOO – Own Opinions Only
www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England
Sylvae in aeternum manent.
-----Original Message-----
From: Scott Xe [mailto:scott...@gmail.com]
Sent: 01 June 2017 17:19
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Min size of double insulation symbol relaxed
Hi Peter,
Thanks for your advice! I read the previous 60056/60950-1/60335-1
standards back to 199x and still could not trace the following requirements.
The dimensions of the symbol for Class II construction shall be such that
the length of the sides of the outer square is about twice the length of the
sides of the inner square.
The length of the sides of the outer square shall not be less than 5mm,
unless the largest dimension of the appliance does not exceed 15cm, in which
case the dimensions of the symbol may be reduced, but the length of the sides
of the outer square shall not be less than 3mm.
I am unable to recall the originate of this requirement and suspect if it
comes from the safety standards. For the time being, I have just to refer to
the latest requirements in safety standards without above requirement.
Regards,
Scott
On 1/6/2017, 12:38 AM, "Peter Tarver" <ptar...@enphaseenergy.com> wrote:
Scott -
The CE mark size is mentioned in RED, but not the double insulation
symbol. The LVD implicitly defers to the CE Marking Directive for size.
IEC 60417 doesn't have a symbol size for Symbol 5172. You might need to
refer to the standard used for the product bearing the Symbol 5172 for the
answer.
Peter Tarver
> -----Original Message-----
> From: Scott Xe
> Sent: Wednesday, May 31, 2017 08:55
>
> Is the minimum size of 5 mm relaxed to the legible reading
> in LVD and RED? Where and when does it introduce?
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