Flexible Conduit [RE-wrenches]

[Mark Frye]

Thanks for the response Erika,

I hope the List does not mind my using some of it's bandwidth to flesh out
an issue that I am looking at.

After sending the post, I re-visited the Code which makes it clear that FMC
must have no more 360 degree of bend.

So question answered.  But why is this?  What is the thinking behind the
requirement?

My sense is that FMC is required to allow removal and re-installation of
conductors.  OK, makes sense.

Why is this an issue for me?  Well, NEC 2005 allows un-disconnected PV DC
conductors to run through a building, but only if in metallic conduit.  OK,
so they can be in FMC, cool, but only 360 degrees.

Well Gee, MC can be bent as much as you like, no limit there under the Code.
So in some difficult retrofits where even running FMC is prohibitive,
wouldn't it be great to use MC.

Of course the recommendation for the NEC 2008 add MC as an allowable method,
but it will be more than 6 years before my jurisdiction adopts that.

But in the end, what is the difference between fishing MC around compared to
pre-loading conductors into FMC and fishing that around.

Just trying to learn a little something and maybe make my job a little
easier.

MPF

-----Original Message-----
From: erika at repowersolutions.com [mailto:erika at repowersolutions.com]
Sent: Thursday, May 17, 2007 6:02 PM
To: RE-wrenches at topica.com
Subject: RE: Flexible Conduit [RE-wrenches]



Why would you want to force the matter?
I would think exceededing 360 any way shape or form would not be cool long
term. I would install a 4x4 box somewhere to interupt the path.
It goes along with the recommendation of a a local inspector "don't be the
XXXhole"

Peqce,
erika


*********************
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-----Original Message-----
From: Mark Frye [mailto:markf at berkeleysolar.com]
Sent: Wednesday, May 16, 2007 10:03 PM
To: RE-wrenches
Subject: [SPAM] Flexible Conduit [RE-wrenches]


If I pre-load conductors into a flexible conduit while it's striaght, prior
to pulling it thought the framing, can I exceed 360 degrees of bending once
it is in place?

MPF


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