Hi Scott,
The power cord acts as the disconnect.
Rick Linford
SonicWALL
-Original Message-
From: Scott Barrows [mailto:sbarr...@curtis-straus.com]
Sent: Friday, April 27, 2001 12:41 PM
To: Rick Linford
Cc: emc-p...@majordomo.ieee.org
Subject:Re: EN60950 (UL1950,
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Hi,
If the switch is being used as the disconnect device it needs to disconnect
both poles simultaneously (2.6.6). 1.7.8.3 only refers to on and off
indications of the equipment.
So I guess I need to know if the switch is being used as a disconnect or
just to turn the machine on and off.
Scott
The scope of the standard says it applies to equipment intended to be
connected to public low-voltage distribution systems of between 220 V and
250 V at 50 Hz line to neutral. Therefore, it does not apply if your
equipment is intended for an industrial application where power is drawn
from other
Is anyone familiar with this test and its applicability to control and
display station equipment used for automation? Is this test appropriate for
this type of equipment?
Thanks,
DB
Hi Rick:
There are three issues which we must address:
1. The safety function of the switch.
2. The safety function of all-pole disconnect
versus one-pole disconnect.
3. The marking of the function of the switch.
*
The safety function of a disconnect device (for
which a
I hit the send button too soon. I forgot to mention the standby symbol. I
added that below.
Rick, let's start with the general requirement per clause 1.7.8.1.
The requirement is Unless it is obviously unnecessary, indicators, switches
and other controls affecting safety shall be
Rick, let's start with the general requirement per clause 1.7.8.1. The
requirement is Unless it is obviously unnecessary, indicators, switches and
other controls affecting safety shall be identified or placed so as to
indicate clearly which function they control. Indications used for this
purpose
Hi,
The scope of the MDD (see below) says nothing about whether a device is
mobile or not. Please look at IEC 60601-1-1 for systems. This gives
examples of what certifications devices need when used in a hospital. i.e.
in the patient vicinity.
For the EMC questions, I am sure someone has
Hi,
Well here is the other side to keep it 50-50.
I have understood the requirement to be that the O symbol can only be used
when all power has been disconnected from the unit. I believe that if you
used a single pole switch on a grounded neutral system, it would be OK. Of
course, this is
Rick,
My opinion based on my understanding of IEC 60950.
Whether an on/off switch breaks one or both sides of the line, the
equipment will be either on or off respectively, as either breaks the
electron path.
It is true that breaking only one side may leave the electronics hot
if the
Hi All,
When a switch opens only one leg of the mains to control power to
equipment should it be marked with the l and O?
Background:
Three different engineers from three different NRTLs indicated it is
permitted, two even required it. A different engineer for one of the
NRTLs and two other
Hello group . . .
I am looking for some 'basic' information on EMC Product Safety in
Colombia.
Do they have a regulatory infrastructure? If yes, is based on European
specifications or
are they looking for UL FCC compliance.
Any input would be greatly aprpeciated.
Regards,
John Juhasz
Fiber
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