<div dir="ltr"><div>AND a PVC conduit buried in a concrete deck is a NO better ground than a steel conduit which has its continuity interrupted by a nonmetallic seismic gasket, when there are no grounding conductors that restore the lost continuity. Large waterproof flex conduit is often not utilized in earthquake country where it would pass solid grounding to the load being powered and workers being protected. We have entire buildings, including our 27+ story 100 million pound Los Angeles City Hall, which sits on huge ball bearings riding on deformed steel plates that are supposedly self-centering, after rolling about four feet. Copper braided straps may or may not be sufficient in a catastrophic earthquake.</div><div>/s/ Richard</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jun 29, 2015 at 12:35 PM, Alex Donkle via Stagecraft <span dir="ltr"><<a href="mailto:stagecraft@theatrical.net" target="_blank">stagecraft@theatrical.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Code still allows steel conduit to be used as a ground, however if it<br>
was power inside of floor boxes then they likely used PVC conduit<br>
routed underground.<br>
<br>
Alex<br>
<div class="HOEnZb"><div class="h5"><br>
On Mon, Jun 29, 2015 at 9:02 AM, Bill Nelson via Stagecraft<br>
<<a href="mailto:stagecraft@theatrical.net">stagecraft@theatrical.net</a>> wrote:<br>
>>> He may have specified what is a "shared neutral" configuration - which is<br>
>>> not the same as "ground and neutral are the same thing".<br>
>><br>
>> Well, yes and no. The result of his design was a 4-pin connector,<br>
>> with 3 3-Ø hot conductors, and one neutral shared among them. The<br>
>> "consultant" said to me, word-for-word, "Ground and neutral are the<br>
>> same thing." We did find that the metal cover of the floor pocket was<br>
>> mechanically grounded back to the distro panel via the conduit, which<br>
>> helped somewhat when exhibitors had modern electronic gear like sound<br>
>> systems or computers.<br>
><br>
> Ah, yes. I should have realized that it would be 3 phase.<br>
><br>
> Doesn't the code allow conduit to be used as the grounding conductor? I would<br>
> never specify such a set-up, but have seen it used.<br>
><br>
> Bill<br>
><br>
><br>
><br>
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