Re: Causes of Ground Faults

["Rocky T Squirrel" <gafa_usa@(nospam)hotmail.com>]

Morgan  you got the prize,,  number one problems  we've had in 24 years on
install  "contract electricans for emt install"  they do all your listed
faults  and they also  do the crawfish too..   LOL
RTS


"G. Morgan" <alarmpro@xxxxxxxxxxx> wrote in message
news:0kceo25vhk6gi66dmgs3cooi1igs4gkrsj@xxxxxxxxxx
> On 18 Dec 2006 12:12:04 -0800, jonlevis@xxxxxxxxx wrote:
>
> >I have been asked to present a training seminar regarding fire alarm
> >systems, in particular addressable systems. I am looking for common
> >causes of Ground Fault Troubles that people have come across. Any one?
>
>
> I'd say the most common is nicking, skinning, and burring the wire
> when it's being pulled.   Common hang ups are un-reamed EMT connected
> to fittings (couplers etc.. ) , iron beams with sharp edges etc...
>
> Pulling too hard or forcing the cable will often result in bad news
> such as stretching and breakage.   Pull slack in multiple locations
> around obstacles, with help if possible, to reduce the urge to
> manhandle it.
>
> Some installers still don't know how to strip the proper length of
> copper for device termination and leave too much hanging out to get
> grounded on the back box when the device is secured to it.
>
>
> Even worse than not stripping the proper length of copper for landing
> on the terminal:   is when guys strip the outer layer of a cable
> jacket  (plenum is the easiest to muss-up) with their strippers and
> use that first cut....  Why do you think the cat's hair is in there???
> Use the cat hair!!  Pull the cat hair down the length of the outer
> jacket and cut away the original jacket strip...  so there is no
> chance of nicks, opens,  or shorts..  sheeze~!!!  Use the damn cat
> hair...
>
> On addressable sytems using isolation modules is a huge deal too..
> explain them.
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> --
>
> -Graham
>
> (delete the double e's to email)