Re: Window Sensors

["Crash Gordon" <webmaster@xxxxxxxxxxxxxxxxxxxxx>]

been there!


--
Crash Gordon
-------ouch------

<I feel like I'm diagonally parked in a parallel universe>
"Just Looking" <nospam@xxxxxxxxxx> wrote in message
news:46fc376c$0$11084$4c368faf@xxxxxxxxxxxxxxxxx
| >If it hits the line any switch you use will be toast.
|
| That seems very logical and the way it should be. However, this has never
| been my experience in real life. If one pictures a string of Christmas
Tree
| lights like switches in a N/C circuit, and calls them in order
| 1,2,3,4,5,6,7,8,9 etc, then damage can occur to only one in the string, or
| half, or all, or any fraction thereof. The degree of damage can range from
| slight to completely obliterated, again all on the same string. The order
| can be totally random as well, like 3, 8, & 9 or 2, 5, & 8, etc. It wasn't
| until I realized that, like throwing a rock in a pond, the induced EMF
moves
| through creating different potentials, like scoring in target practice. If
| you can picture the strike point, and how the loop wire is positioned in
| reference to the strike point, the damage you find will begin to make some
| sense, though never completely. Lightning is not only terrifying and
| destructive, it remains mysterious as well.
|
| "Robert L Bass" <RobertLBass@xxxxxxxxxxx> wrote in message
| news:%2VKi.5357$tJ4.3100@xxxxxxxxxxx
| > "Crash Gordon" wrote:
| > >
| > > Surface mount switches have some advantages;
| > >
| > > Alignment problems over time are EASY to spot...recessed switches
| > > that were difficult to align to begin with are a PITA to find/fix
| > > when you have a no-set 5 years from now.
| > >
| > > They're inside protected from snow/rain, and expansion/contraction
| > > of wood (even vinylclad moves)
| > >
| > > Where I am they are less succeptable to lightning damage.
| > >
| > > You can find small ones in various colors so you'll barely see them
| > > against the window frame.
| >
| > I've used both types for many years.  I prefer recessed contacts
| > whenever they can be used which for me is most of the time.  My
| > business was in CT where almost every home and business has a
| > basement and an accessible attic.  GE Security (nee: Sentrol) makes a
| > good switch for use in new wood which *might* contract, though any
| > good quality new window or door frame should be made of aged wood
| > (doesn't shrink).  The 1275 sensor has little "wings" on the sides
| > which allow the switch to fit snugly in a slightly over or under
| > sized hole.  The switch is also easier to pull out should it ever
| > need replacement.
| >
| > Since the sensors are hermetically sealed and we soldered our
| > splices, moisture has not been a problem IME.
| >
| > I disagree about lightning damage.  If it hits the line any switch
| > you use will be toast.  The best way to reduce the likelihood of
| > lightning damage is to use a bonded ground for all incoming services.
| >
| > That said, I've used thousands of surface mounted magnetic contacts
| > over the years.  All other things being the same they hold up as well
| > as recessed ones.  The only weakness is they are more subject to
| > impact damage if they're mounted near the floor or on a window sill
| > that gets a lot of activity.
| >
| > I prefer the recessed ones primarily because they're not noticeable.
| >
| > --
| >
| > Regards,
| > Robert L Bass
| >
| > =============================>
| > Bass Home Electronics
| > 941-925-8650
| > 4883 Fallcrest Circle
| > Sarasota · Florida · 34233
| > http://www.bassburglaralarms.com
| > =============================>
| >
| >
|
|