Option B: Ensuring Ground Communications in Buildings

AI Thread Summary
Option B raises concerns about using a building's ground for communication, particularly regarding signal clarity and potential damage from electrical transients. The standard for POTS in the US is -48V, and using the building ground instead of a second conductor could compromise signal quality. While the user expresses a willingness to tolerate some noise as long as communication is possible, the risks associated with this setup, such as increased susceptibility to surges, remain significant. Ultimately, using a proper twisted pair is recommended for reliable communication. The discussion highlights the importance of maintaining clear communication lines in building environments.
Liad
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Hey!


I know that with option A I have an always-open-line and no problems in communication...


What I would like to know is, if option B will work when the ground is the building ground?



Liad.:)
 

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Not sure I understand your question. What kind of phones, and what is the 24V? In the US, the POTS (plain old telephone sets) use -48V for power. And if you are asking if you can use a building ground instead of the 2nd conductor in the twisted pair of phone line, the answer in general would be "not if you want a clear signal". Also, building ground is susceptible to electrical transients (like surges caused by nearby lightning strikes), so the chance of damaging the phones would increase if wired that way.
 
As for damaging the phones - they wouldn be connected for a long time and I don't really care about them. :smile:


A for noise - as long the line will work and I'll be able to understand what the person in the other end says - I'm ok with it.

The phones are just plain phones, and 24v is enough to get the line open with no noises.
 

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