[PRCo] Overhead Wire // Clamps

[Jim Holland]

 > Robert Simpson wrote:
.
 > Jim;
 > I had no idea the trolley wires were as big as a dime in diameter!
.
.
2/0 Round trolley wire - 0.365" diameter.
.
3/0    "          "      "     - 0.410" diameter
.
4/0    "          "      "     - 0.460" diameter.
.
Donut know which size PRCo used.
.
.
Also including a cross section of  4/0  *_Grooved_*  trolley wire which 
was not installed in Pgh until Overhead was strung for Pans.     The  
Groove  allows an obstruction free under run for the Collector  (luv 
this Fancy Talk)  which Is Needed for Pans and greatly improves tracking 
of Wheel // Shoe.     Note how the groove is On The Top of the wire so 
that when an ear is clamped on it doesn't protrude beyond the wire by 
much If Any so doesn't obstruct the shoe.
.
Still, as I have said, I experienced as many Dewirements Daily in SF in 
the 1970s as I experienced in 20-years living in Pittsburgh  --  Pgh 
with Round wire, ears which wrap around the wire  (tapered on the bottom 
to smooth passage of wheel,) armors used around the wire to protect ears 
which definitely makes a bump even though approach and exit were 
tapered.     SF used Shoes on grooved wire except for outer portions of 
M line which was still round.
.
Also shown is ear for on grooved wire.     While this indicates for shoe 
operation only it was similar for other collectors.
.
.
 > I also remember seeing very heavy cables running immediately
 > beside the PRCo tracks which I assume carried the bulk
 > of the electrical supply.
 > Any idea how big these cables were in diameter?
.
.
I am getting my information from a variety of Ohio Brass Transit 
Catalogs, O-B a Major supplier for TrolleyCar, TrolleyCoach, lrv pans 
until the 1980s 1990 when it was sold.     I don't see anything on 
feeder cable by O-B but they have much on rail bonds  --  12 pages of 
product and info, testing, splicers, bonds themselves, resistance 
levels, etc.
.
.
 > Robert Simpson
.
.
-- 
*Jim Holland*

Studying *Pittsburgh Railways Company*

....................From 1930 -- 1950

*Pennsylvania Trolley Museum (PTM)*

http://www.pa-trolley.org/

*N.M.R.A.*

http://www.nmra.org/



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