Home Open Account Help 289 users online

Eastern Railroad Discussion > PRR PL signal question


Date: 07/28/20 18:48
PRR PL signal question
Author: 611Doug

Technical question.  What was the voltage used in this system?  I seem to remember that as originally installed it was a 32 volt system.  Does anyone know if that is correct and was the system modified in later years to a more conventional voltage, like 120 volts?
Thanks,
Doug



Date: 07/28/20 22:49
Re: PRR PL signal question
Author: SP4360

I don't know what their system is, but most if not all signal systems today run on 12vdc, using 10v25w signal precision bulbs and LED's.



Date: 07/29/20 10:23
Re: PRR PL signal question
Author: CGTower

No signal systems supply lamp voltage at 120 volts. Lamps are usually lit at 10V DC...

CG Tower

611Doug Wrote:
-------------------------------------------------------
> Technical question.  What was the voltage used in
> this system?  I seem to remember that as
> originally installed it was a 32 volt system. 
> Does anyone know if that is correct and was the
> system modified in later years to a more
> conventional voltage, like 120 volts?
> Thanks,
> Doug



Date: 07/29/20 15:45
Re: PRR PL signal question
Author: NixonRocks

I seem to recall the lamp voltage would change with the time of day, higher voltage during the day, lower at night
 



Date: 08/01/20 07:47
Re: PRR PL signal question
Author: engineerinvirginia

NixonRocks Wrote:
-------------------------------------------------------
> I seem to recall the lamp voltage would change
> with the time of day, higher voltage during the
> day, lower at night
>  

Perhaps with incandescent bulbs though not all of them have this capability....LED, for their part have a trigger voltage below which they will not make light...and while there is dimmable technology for LED's I do not see it used in signals....the ones I am exposed to are quite bright at night....



[ Share Thread on Facebook ] [ Search ] [ Start a New Thread ] [ Back to Thread List ] [ <Newer ] [ Older> ] 
Page created in 0.0347 seconds