EMT - UL Heads Up [RE-wrenches]

[Keith Cronin]

It has been a while since I lived in a cold climate, but I thought the
supply houses had expansion fittings, i.e. pvc couplings that were able
to expand and contract to compensate for temp differentials. They were
longer and had a deeper coupling, which allowed for movement.
Another option might be to have flex at a certain interval on horizontal
runs, kind of like how it is done on bridges.
The last time I checked, the whole world was moving, so we should try to
compensate for it.

aloha

Keith Cronin
President
Island Energy Solutions Inc
318A Kuulei Rd
Kailua, HI 96734
808-262-3268 Tel
808-263-0338 Fax
keith at islandenergy.net
www.islandenergy.net
 
 
 
 
 
 
 
 

-----Original Message-----
From: Tom Lane, Energy Conservation Services [mailto:tom at ecs-solar.com] 
Sent: Wednesday, March 17, 2004 4:22 AM
To: RE-wrenches at topica.com
Subject: Re: EMT - UL Heads Up [RE-wrenches]

put cardboard under the PVC pipes and spray paint with an exterior
automotive spray paint an exterior acrylic the same color as the color
of
the roof.      The pipe must age for one year in the sun or clean the
pipe
with PVC pipe cleaner and then spray the PVC pipe with the color that
matches the roof. I suggest automotive spray paints that can be
purchased at
any paint store.

Gator Tom

----- Original Message ----- 
From: "Matt Tritt" <solarone at charter.net>
To: <RE-wrenches at topica.com>
Sent: Tuesday, March 16, 2004 7:01 PM
Subject: RE: EMT - UL Heads Up [RE-wrenches]


> This is sure to get a rise from someone, but on one of the first PV
jobs
> I did back in 80, I worked with an "old time" electrician who insisted
> that the couplings on our underground run be left un-glued at the
lowest
> point in the trench. He said that this allowed the water, which would
> inevitably show up in the conduit, to find a way out. PVC was pretty
new
> at the time so I don't know where he got his idea.
>
> I thought that what goes out would also come in the same way, but I've
> never had a call-back, so who knows.
>
> I have also had very good success with oxidation prevention by
painting
> PVC with good latex house paint. This can look really crappy if done
in
> a hurry.
>
> I would like to add that PVC, being non-conductive, has always seemed
a
> lot safer to work around than e.m.t after getting hit a couple of
times
> from old e.m.t. installations with ground faults.
>
> Matt T
>
> -----Original Message-----
> From: Bruce Geddes [mailto:b.geddes at clear.net.nz]
> Sent: Tuesday, March 16, 2004 12:33 PM
> To: RE-wrenches at topica.com
> Subject: Re: EMT - UL Heads Up [RE-wrenches]
>
>
> Hi All,
>             Following this thread with interest.
>
> Being in New Zealand complete with ozone hole exposes us to some of
the
> highest UV levels to be found.  PVC conduit is used widely here but it
> is stamped UPVC for UV stabilised.
>
> I have seen installations exposed that are older than 20 years and the
> conduit is intact.  The surface does go faded and a powdery layer
forms
> but it is only very thin.  The underlying material is good.  We use
two
> colours, grey and orange and both behave the same.  The biggest
problem
> is impact damage as PVC is relatively brittle.
>
> As pointed out in other posts if it is not supported frequently the
> conduit will sag between fixings.  If there is enough of this sagging
> the glue together joints can seperate if not glued properly.
>
> Condensation is an issue and even the moistureproof boxes I use on
> rooftops still develop some moisture inside after years of use.  I now
> drill small drain holes at low points and ensure that there are low
> points before every termination or penetration.
>
> I use rigid for the main runs and have a length of flexible jointed on
> to run up to PV junction boxes.  This allows the panels to be tilted
and
> lay over for maintenance work.
>
> Metal conduit has not been widely used here for decades.  I know that
> this is not the USA and your NEC is different, but electricity is
> electricity. Incidentaly we use 230/400VAC 50Hz.
>
> So at the end of the day PVC conduit has a place and can do the job.
> Longevity has as much to with installation techniques as with the
> material.
>
> Just my NZ$0.02 worth  (US$0.013)
>
> Bruce Geddes
> PowerOn
>
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