<div dir="ltr">This is interesting, since the definition of high voltage was changed to >1000V a few code cycles ago and it is somewhat consistently applied throughout the NEC at that voltage (except for workspace clearances...er). It seems this 392.18 label requirement could cause confusion and should be changed to apply to >1000V circuits. However, the definition of high voltage only applies with Article 490 , Equipment >1000V so the Article 392 Cable Tray folks can do what they want in terms of where they require high voltage labeling. I haven't done any research on the history of this labeling requirement. <div><br></div><div><br><div>Corey maybe you would be willing to make a public input to change where the label is required to >1000V circuits, thus there would be no conflict with 690 since PV DC circuits in or on buildings cannot be >1000V. Due Sept 10! <br><div><br><div>4<span class="gmail-nfcss-label" style="font-size:larger;font-weight:bold;color:rgb(0,0,0);box-sizing:inherit;max-height:1e +06px">90.2</span><span style="font-size:larger;font-weight:bold;color:rgb(0,0,0)"> </span><span class="gmail-nfcss-title" style="font-size:larger;font-weight:bold;color:rgb(0,0,0);box-sizing:inherit;max-height:1e +06px">Definition.</span><div style="box-sizing:inherit;max-height:1e +06px;color:rgb(0,0,0);font-size:12px"><div id="gmail-ID000700004927" class="gmail-nfcss-topic gmail-nfcss-section gmail-nfcss-nec" style="box-sizing:inherit;max-height:1e +06px;margin-bottom:10px"><div class="gmail-nfcss-body gmail-nfcss-tc-change" style="box-sizing:inherit;max-height:1e +06px;color:rgb(96,96,96);background-color:rgb(211,211,211)"><p class="gmail-nfcss-p" style="box-sizing:inherit;max-height:1e +06px;margin:0px 0px 1.2em">The definition in this section shall apply only within this article.</p></div></div></div><div style="box-sizing:inherit;max-height:1e +06px;color:rgb(0,0,0);font-size:12px"><div id="gmail-ID000700004928" class="gmail-nfcss-topic gmail-nfcss-definition gmail-nfcss-nec" style="box-sizing:inherit;max-height:1e +06px;margin-bottom:10px;padding-top:0.8em"><div class="gmail-nfcss-title" style="box-sizing:inherit;max-height:1e +06px;font-weight:bold;font-size:larger;padding-bottom:3px"><span class="gmail-nfcss-title" style="box-sizing:inherit;max-height:1e +06px">High Voltage.</span></div><div class="gmail-nfcss-body" style="box-sizing:inherit;max-height:1e +06px;color:rgb(96,96,96)"><p class="gmail-nfcss-p" style="box-sizing:inherit;max-height:1e +06px;margin:0px 0px 1.2em"><span class="gmail-nfcss-tc-change" style="box-sizing:inherit;max-height:1e +06px;background-color:rgb(211,211,211)">A potential difference of</span> more than 1000 volts, nominal.</p></div></div></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div><br>Thanks for bringing this up Corey! </div></div></div></div></div><br></div></div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Sep 3, 2020 at 12:36 AM Ray <<a href="mailto:ray@solarray.com">ray@solarray.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p>This is interesting, because we were considering cable trays,
too. My guess is that both requirements would apply. Picky, but
I don't see that 690 exempts the requirements of 392. One is for
PV, one is for over 600 v. Some code iteration in the future
might have combined language for PV over 600 v " Danger - High
Voltage Photovoltaic Source - Keep Away" and of course that's so
verbose that the average Joe is just going to stick his paws in
there anyway.....<br>
</p>
<pre cols="72">Ray Walters
Remote Solar
303 505-8760</pre>
<div>On 9/2/20 7:54 PM, Corey Shalanski
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Wrenches,
<div><br>
</div>
<div>I am curious about the marking requirements for cable trays
containing PV source/output circuits rated over 600 volts,
installed on a building:</div>
<div>
<blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px">
<div><br>
</div>
<div>NEC 392.18(H) requires a permanent, legible warning
notice carrying the wording \u201cDANGER \u2014 HIGH VOLTAGE \u2014 KEEP
AWAY\u201d at least once every 10 ft.</div>
<div><br>
</div>
</blockquote>
<blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px">
<div>NEC 690.31(G)(3) requires a label or marking with the
wording "WARNING: PHOTOVOLTAIC POWER SOURCE" at least once
every 10 ft.</div>
<div><br>
</div>
</blockquote>
Does the 690.31 label take precedence? Are there any
situations where both labels would be required (or
recommended)?</div>
<div><br>
</div>
<div>--</div>
<div>Corey Shalanski</div>
<div>Jah Light Solar</div>
<div>Portland, Jamaica</div>
</div>
<br>
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