<br><font size=2 face="sans-serif">Hi Wrenches,</font>
<br><font size=2 face="sans-serif"> There is no "implication"
other than confirming how the disco </font>
<br><font size=2 face="sans-serif">is tested, and thus certified. It probably
makes no difference electrically which position the</font>
<br><font size=2 face="sans-serif"> unit is mounted, but AHJs may
have differing opinions on whether this would be permitted. </font>
<br><font size=2 face="sans-serif">Rgds,<br>
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<table width=100%>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">From:</font>
<td><font size=1 face="sans-serif">Bob-O Schultze <bob-o@electronconnection.com></font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">To:</font>
<td><font size=1 face="sans-serif">RE-wrenches <re-wrenches@lists.re-wrenches.org></font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Date:</font>
<td><font size=1 face="sans-serif">11/11/2013 10:09 AM</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Subject:</font>
<td><font size=1 face="sans-serif">Re: [RE-wrenches] Square D Disconnects
mounted on the slope of the roof.</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Sent by:</font>
<td><font size=1 face="sans-serif">re-wrenches-bounces@lists.re-wrenches.org</font></table>
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<br><tt><font size=2>Dan,<br>
I think this thread applied not to OCDs but to an unfused 600VDC disconnect
can mounted on a roof which is less than vertical.<br>
Bob-O<br>
On Nov 11, 2013, at 9:21 AM, Exeltech wrote:<br>
<br>
Wrenches,<br>
<br>
There appears to be some misinformation getting into this thread.<br>
<br>
The "trip" mechanism within standard thermal over-current protective
devices ("OCP devices") is mechanically spring-loaded, and is
triggered by heat.<br>
<br>
Eric mentions below that Square D breakers are tested in a vertical orientation
only - the implication being that's their only "UL certified"
position. If this were true, it would imply the breakers cannot be
used in any other orientation. This would potentially limit the Square
D OCP market to sub-panels and other enclosures where the devices are vertical.
Inasmuch as the vast majority of panelboards I've encountered in
my 40+ years in this industry have the breakers stacked horizontally, it
would not be a wise business decision for the manufacturer to self-inflict
such a limitation on their product.<br>
<br>
This also does not mean any such limitation (real or not) applies to all
breakers.<br>
<br>
By way of example, OCP devices work in a horizontal position, stacked "pancake"
style in a main panelboard, as well as vertically oriented side-by-side
in a sub-panel. In either orientation, they are in full compliance
with UL 489, (UL Standard for Circuit Breakers, Switches, and Circuit Breaker
Enclosures). If an OCP device *was* positionally-sensitive, UL Standards
require this sensitivity to be noted in the documentation accompanying
the device. Further to that point, UL 489 Section 7.1.1.13 states:
"In determining if a circuit breaker complies with the test requirements,
the device shall be mounted or supported as in service and tested under
conditions approximating those of intended operation, except as otherwise
noted."<br>
<br>
Mounting position notwithstanding, a greater concern would be the ambient
temperature of a rooftop location, whereby summer heat would tend to make
the OCP device more sensitive than necessary, potentially causing it to
trip at an amperage below that of its UL ratings. While a nuisance,
a more serious issue arises when operating the OCP device in cold ambient
conditions, whereby the device may allow MORE than its rated trip current
to flow.<br>
<br>
Per UL 489, OCP devices are tested at either 25C or 40C ambient. Again
per UL 489, if an OCP device is to be used in ambient conditions other
than those two ranges, the acceptable temperature range for that OCP device
shall be marked on the body of the device.<br>
<br>
In UL 489, Supplemental Annex, Section 2, Subsection 2.3.3, mechanical
vibration testing is conducted with OCP devices oriented vertically, horizontally,
and inclined 30 degrees from vertical, with all devices energized up to
200% of the device rated current during the testing.<br>
<br>
Given the preceding, and per implication of UL 489 testing methods, OCP
devices are NOT positionally sensitive.<br>
<br>
In conclusion, if you DO install a rooftop OCP system, and for proper protection,
please ensure the OCP devices utilized are rated for the worst-case ambient
temperatures involved.<br>
<br>
<br>
Regards to all,<br>
<br>
<br>
Dan Lepinski<br>
<br>
<br>
<br>
<br>
At 09:33 AM 11/8/2013, you wrote:<br>
<br>
Hi Kirpal,<br>
<br>
All Square D safety switches are UL tested in the Vertical position ONLY,
so if someone is trying to install a switch in any other position other
than vertical, that will be between them and the inspector.<br>
<br>
Hope this helps. <br>
<br>
Eric<br>
____________________________________________________________________________________<br>
<br>
Eric Bentsen | Schneider Electric | Solar Business
| UNITED STATES | Technical Support Representative
<br>
Phone: +(650) 351-8237 ext. 001# | Email: eric.bentsen@schneider-electric.com
| Site: </font></tt><a href="www.schneider-electric.com/solar"><tt><font size=2>www.schneider-electric.com/solar</font></tt></a><tt><font size=2>
| Address: 250 South Vasco Rd., Livermore, CA 94551 <br>
<br>
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