On 6/16/2008, Alex Horvath wrote:
Or product is a telcom industry product designed that will be located in
"back room" type application. It is chassis based (metal) and I have selected
a chassis mount, metal case AC-DC power supply that will be mounted inside the
chassis. The rub here is that the inside of the chassis will be customer
accessible (customer is sys admin type personnel) for routine/necessary
product configuration. The chassis is accessed via 2 thumbscrews that allow a
panel to swing open at which point the AC terminals on the power supply will
be exposed.
Hi Alex:
Do you have a copy of UL 60950-1 (presumably the relevant UL standard for this
product)? If not, it would be a good idea to get a copy and study the
sections on accessibility.
While some of the requirements in UL 60950 are rather technical and may
require specialized expertise to understand, the various requirements for
accessibility are fairly straightforward. The standard defines certain
technical terms in clause 1.2.7, such as "Operator Access Area," "Service
Access Area," and "Restricted Access Location." There are different
restrictions on what can be accessible in each area.
>From your brief description, it sounds like your application would be
classified as an Operator Access Area, in which case the AC mains terminals
would definitely have to be guarded to prevent operator contact with them. By
changing some aspects of the design and documentation, you might be able to
classify this as a Service Access Area or a Restricted Access Location. There
is a little more flexibility for these classifications, but in general it is
still best to guard the AC mains connections if at all possible.
The requirements for Service Access Area and restricted Access Location appear
in clauses 2.1.2 and 2.1.3, respectively.
Joe Randolph
Telecom Design Consultant
Randolph Telecom, Inc.
781-721-2848 (USA)
[email protected]
http://www.randolph-telecom.com <http://www.randolph-telecom.com/>
Joe Randolph
Telecom Design Consultant
Randolph Telecom, Inc.
781-721-2848 (USA)
[email protected]
http://www.randolph-telecom.com <http://www.randolph-telecom.com/>
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