[RE-wrenches] Concrete tight versus raintight

[Erika Weliczko]

Madison Electric has an actual rubber washer to seal fitting to box as lock ring is tightened.  

They are however fussy with the internal rings. 

Erika Weliczko
REpower Solutions
cell: 216.402.4458

On Jan 16, 2014, at 2:54 PM, "William Miller" <william at millersolar.com> wrote:

> Friends:
>  
> We used some Bridgeport fittings yesterday.  My foreman reports the following:
>  
> The new blue rain tite connectors have a prob. The connectors have a plastic gasket/ring that seals between the connector body and the box. It is impossible to tighten the con to box without destroying the ring or having a slightly loose con/box connection. A loose connection means poor bonding.
>  
> I would add that any looseness of these fittings can contribute to mechanical failure of conduit runs.  We rely on code compliant strapping *and* secure tightening of fittings to keep a conduit assembly secure and in place for years to come.  It looks like we need to find a fitting with firmer washers.  The Arlington NMLT fittings have yellow washers that are pretty rigid.  I will rob one and try it on the Bridgeports.  We bought a quantity of the EMT fittings and I don’t want to have to replace them…
>  
> William
>  
>  
>  
> From: re-wrenches-bounces at lists.re-wrenches.org [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of August Goers
> Sent: Thursday, January 16, 2014 8:00 AM
> To: RE-wrenches
> Subject: Re: [RE-wrenches] Concrete tight versus raintight
>  
> Hi William,
>  
> About 5 years ago this became a big issue up in San Francisco and we had to learn the hard way. We used to just go buy outdoor EMT fittings and we were okay, then the inspectors started requiring fittings that say raintight or wet location (often stamped “wetloc”) on them. I don’t know for certain, but I believe it might have been a clarification added in the 2008 NEC at the time. See “NEC 358.42 Couplings and Connectors. Couplings and connectors used with EMT shall be made up tight. Where buried in masonry or concrete, they shall be concretetight type. Where installed in wet locations, they shall comply with 314.15.”
>  
> If you go over to NEC 314.15 they mention that fittings installed in wet locations shall be listed for use in wet locations.
>  
> So, you just need to make sure that the fittings you get are listed for the correct purpose. I have seen both concretetight and wetloc type. As someone else mentioned, most of the wetloc fittings have a plastic sealing ring in them and many or blue colored.
>  
> Best,
>  
> August
> Luminalt
>  
> From: re-wrenches-bounces at lists.re-wrenches.org [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of William Miller
> Sent: Wednesday, January 15, 2014 10:32 PM
> To: RE-wrenches
> Subject: [RE-wrenches] Concrete tight versus raintight
>  
> Friends:
>  
> It appears I may have a whole in my education.  I thought all EMT compression fittings were alike.  It appears that I have been using “concrete tight” fittings where I should have been using “raintight” fittings.  Did they use to be the same item?  I did a web search on the differences and came up empty.  I want to be informed in this area and appreciate any knowledge.
>  
> William Miller
>  
>  
> <image001.jpg>
> Lic 773985
> millersolar.com
> 805-438-5600
>  
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