<p dir="ltr">There is another TLA I am missing which describes the lightweight non threaded conduit. It, unlike the other stuff, is not considered,"rigid", despite seeming quite rigid to me... </p>
<div class="gmail_quote">On Jul 31, 2012 4:04 PM, "Michael H. Warfield" <<a href="mailto:mhw@wittsend.com">mhw@wittsend.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
On Tue, 2012-07-31 at 14:36 -0400, <a href="mailto:mike@trausch.us">mike@trausch.us</a> wrote:<br>
> On 07/31/2012 02:15 PM, Greg Clifton wrote:<br>
> > A related question occurs to me. I would assume that the grey<br>
> > (PVC?) electrical conduit would not be allowed for plenum installation,<br>
> > rather you would have to use the thin walled metal, no? Otherwise,<br>
> > wouldn't putting PVC cable in PVC conduit defeat the purpose of using<br>
> > conduit so as not to get gassed by the Chlorine content of the PVC when<br>
> > the fire starts?<br>
<br>
> I am pretty sure that insofar as conduit is concerned, you must use<br>
> either EMT or rigid conduit in commercial installations, and rigid<br>
> conduit is typically required for things that run voltage greater than<br>
> that which is used for communications and data lines.<br>
<br>
Huh? EMT is "Electrical Metal Tubing" - AKA rigid conduit. Basically<br>
the thin-walled tubing you use with a varied of connectors into boxes<br>
and what not. The 1/2", 3/4", and 1" thin walled pipe you get in the<br>
electrical department of Home Depot and Lowes. It's perfectly fine for<br>
110VAC/220VAC and even some 208 3-phase. If you get much above 1" EMT<br>
(lots of wires or large gauge / high current) or your dealing with<br>
higher voltages (I've dealt with 440 3-phase commercial stuff in the<br>
past - not fun) then you're going to be using the heavy gauge pipe that<br>
screws into screw fittings or uses locking bushings directly on the<br>
threaded pipe and you could almost use as pressurized water pipe.<br>
That's what you use for service entrance masts and wires that are rated<br>
in mcm cross section rather than gauge.<br>
<br>
What are you referring to when you are referring to EMT? They use EMT<br>
for 110VAC branch wiring in commercial all the time unless things have<br>
radically changed since I worked as an electrician. When you say "and<br>
rigid conduit is typically required for things that run voltage greater<br>
than that which is used for communications and data lines" that seems to<br>
imply you can't use EMT for that and that doesn't make sense to me, the<br>
way you phrased it.<br>
<br>
You can also run 110/220 through flexible metal conduit as well, though<br>
those are normally limited to hookup runs to equipment like HVAC gear.<br>
<br>
Regards,<br>
Mike<br>
<br>
> In a house, you can get away with PVC or plastic conduit. Code is much<br>
> more strict with regard to commercial buildings. Also, the conduit must<br>
> be grounded.<br>
><br>
> There are some exceptions for raceways, but I don't intend on using such<br>
> things. Personally, I am a fan of putting things in a way or using a<br>
> metal conduit that will more-or-less blend in once painted.<br>
><br>
> --- Mike<br>
><br>
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Michael H. Warfield (AI4NB) | <a href="tel:%28770%29%20985-6132" value="+17709856132">(770) 985-6132</a> | mhw@WittsEnd.com<br>
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