EMT - UL Heads Up [RE-wrenches]

[Tom Lane, Energy Conservation Services]

always clean the glue off the pipe outside the hub that was glued tom
----- Original Message ----- 
From: "Bruce Geddes" <b.geddes at clear.net.nz>
To: <RE-wrenches at topica.com>
Sent: Tuesday, March 16, 2004 3:32 PM
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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>

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