[PRCo] Re: Cin

[Boris Cefer]

OK, these are contactors. I did not look at them closely. But aren't
contactors usually on the wire which is not grounded?

I am aware some PCC equipment with "variable polarity". I have to look
whether my books contain any such diagrams and what that "variable polarity"
means in the term of function.

Semiconductor propulsion is far more sensitive on polarity. Unless there is
a sophisticated system that allows automatical polarity conversion, it can't
work. If there are experts on electrical engineering in relation to transit,
each comment is welcome!

B

----- Original Message -----
From: "Jim Holland" <prcopcc at p-r-co.com>
To: "- 1714 PRCo__WP__JTC (WP-Cleveland;__DCT) -"
<pittsburgh-railways at dementia.org>; "- 1717 PRCo__WP__JTC
(WP-Cleveland;__DCT) -" <pittsburgh-railways at dementia.org>
Sent: Wednesday, January 17, 2007 12:31 PM
Subject: [PRCo] Re: Cin


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> .
> Boris  --  Ain't no insulators in Any Wires in this  URL::
> .
>
http://lists.dementia.org/files/pittsburgh-railways/1166%20X%20Zoo%201950xxx
x.jpg
> .
> Those items in the outer wires just behind 1166 are simple trolley
> collector contactors like Pittsburgh used for Nachods  --  they are not
> insulators.       These contactors just pass the current from the wire
> to contactor and to whatever is connected to that contactor.       This
> gives more credence to my  'assumption'  that these are dedicated
> contactors to set the turnout track for 49 - right wire  (left from our
> viewpoint)  to go into the loop  and the left wire  (our right)  sets
> the turnout for the 78 to go straight through.
> .
> I went to the website to get this message which never arrived
> here.       I have since sent in a drawing and map of this location
> which has Not shown up here nor has it shown up at the website.
> .
> VERY___Interesting your comments about polarity and the PCC  --  the
> Muni older Flyer TCs were simple beasts but the electronic  ETI's  are
> more PCC-esque and I wonder about polarity reverse in relationship to
> them.       We do still have some overhead like that here in SF;  we
> just had a discussion about same on the SFMuniHistory list!!!
> .
> Now,  Lettuce see if this goes through  --  And When  --  If-Ever!!!
> .
> .
> .
> Jim___Holland
>
>
>
>