PSNetters,
Products are becoming more complex and more readily
available.
I'm presently working on a project with a commercial version
of an LED arrangement which also has a solar panel attached to each LED (to
make the project 'green').
The device has both a line operated power supply to run the
LED's and an inverter to take the solar power and either run the LEDs or
return the power to the grid. There are 3 power supplies involved in this
arrangement; a 120Vac and a 240Vac connexion plus the DC return from the
solar panels (which can be ganged to step up the voltage - up to 600Vdc is
commonly used for commercial solar installations in the US).
All of the components are readily available and this could
be a 'Popular Mechanics' project for the do-it-yourselfer or a simple
product made readily available which should be installed by a qualified
electrician but seems simple enough for a lot of folks to tackle.
This innocuous looking product is rather dangerous in the
sense that we have been discussing. Even if the AC circuits are
disconnected at the switch panel, the DC circuit still provides voltage and
current when the sun is shining. (Maybe the marking should add to only
service the unit after dark.)
So the world continues to become more complicated; I will
promote my universal hazard marking: 'nicht for gefingerpoken' which needs
no translation into most western languages.
:>) br, Pete
Peter E Perkins, PE
Principal Product Safety Engineer
PO Box 23427
Tigard, ORe 97281-3427
503/452-1201 fone/fax
[email protected]
_ _ _ _ _
I used to see a common statement on consumer products that says, "No User
Serviceable Parts Inside". I wonder what standard required that because it
is just a statement, not a warning. It should say something like, "Hey, if
this is not working chances are you cannot fix it, so don't open it up or
you might hurt yourself and then try to sue our company." But still, the
user is not informed what the hazard is. Might be high voltage, radioactive,
kinetic energy, or a small alligator waiting to bite your hand off.
Smile. It's almost Friday.
The Other Brian
PS: You are right; ISM and machinery are generally repaired when not working
right where consumer products are tossed. We have to protect our service
personnel as well.
From: Ted Eckert [mailto:[email protected]]
Sent: Thursday, October 23, 2014 2:59 PM
To: [email protected]
Subject: Re: [PSES] Disconnect power before servicing label required?
The requirements vary depending on the product type. To some extent, the
requirements for marking panels that enclose hazardous voltages depend on
the risk that the end user will remove the panel. It is reasonable to
anticipate that the end user would remove panels on industrial equipment.
However, this is not necessarily true for many consumer products. For a
product used in the home, Torx screws may be sufficient to make a panel
considered a non-removable part. This view has become more prevalent as we
move more towards a throw-away society. If a $15 hand mixer stops working,
the owner is far more likely to throw it away than to unscrew the case to
see what is wrong. There will be some people who will try to repair their
appliances, but it becomes their responsibility to unplug it first.
I can also note that I believe that there is a general principle that plug
connected consumer equipment is viewed differently. As I noted, it is
expected that the device will be unplugged before servicing. Industrial
equipment is more likely to be hard wired where the service personnel may
not know which parts are live or which parts are de-energized by a
disconnect. Of course, product standards will vary in marking requirements
and what I have said can be viewed only as a general guideline.
Ted Eckert
Compliance Engineer
Microsoft Corporation
[email protected]
The opinions expressed are my own and do not necessarily reflect those of my
employer. They do not necessarily reflect those of any standards writing
organization. They may not reflect reality. Consider them just a stream of
consciouness from somebody with a few spare minutes before their next
meeting starts.
From: Kunde, Brian [mailto:[email protected]]
Sent: Thursday, October 23, 2014 11:21 AM
To: [email protected]
Subject: Re: [PSES] Disconnect power before servicing label required?
I thought it was common in most safety standards to require such a warning
marking on panels with AC Mains hazard behind them. Something like this
statement from IEC/EN/UL 61010-1 for ISM equipment:
"If the instructions for use state that an OPERATOR is permitted to gain
access, using a TOOL, to a part which
in NORMAL USE may be HAZARDOUS LIVE, there shall be a warning marking which
states that the equipment
must be isolated or disconnected from the HAZARDOUS LIVE voltage before
access."
I thought a high voltage warning marking was required on all panels with
such hazards behind them. Is this not true or just not true for IT
equipment?
I also thought that devices with multiple power sources, such as two AC
power cords, had to have a warning marking informing the user to disconnect
both or all power connections before gaining access.
The Other Brian
From: Jim Hulbert [mailto:[email protected]]
Sent: Thursday, October 23, 2014 1:55 PM
To: [email protected]
Subject: Re: [PSES] Disconnect power before servicing label required?
Thanks for the replies. This product only has a single external power
source, so no label is required. (And yes, BoĊĦtjan, I meant appliance
"inlet", not "outlet").
Jim
From: Jim Hulbert [mailto:[email protected]]
Sent: Thursday, October 23, 2014 1:09 PM
To: [email protected]
Subject: [PSES] Disconnect power before servicing label required?
A question has been posed to me, with reference to ITE standards UL/EN
60950-1, whether a label is required near the appliance outlet stating
"disconnect power before servicing". The equipment is table top ITE,
pluggable with a detachable cord. I do think it is an appropriate
instruction for the manuals, but I don't see a requirement for it to be on a
label. Is it acceptable to have the instruction in the manual only?
Thanks.
Jim Hulbert
Pitney Bowes
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