Re: Surge / Ground / Lightning

In article <MPG.228ed36d8abd368c989c07@[EMAIL PROTECTED]
> krw
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>In article <bc45f$48248dbc$4213ea37$25354@[EMAIL PROTECTED]
>, 
>remove.budnews@[EMAIL PROTECTED]
 says...
>> krw wrote:
>> > In article <OKadnRdUKpg42L7VnZ2dnUVZ_tPinZ2d@[EMAIL PROTECTED]
>, 
>> > me@[EMAIL PROTECTED]
 says...
>> >>> Mike Tomlinson wrote:
>> >>>>
>> >>>>> Phone wires were clamped to ground before the 1960s?
>> >>>> It was common to earth one leg of the incoming pair to either the
house
>> >>>> ground or to its own rod.  An earth connection also allowed "party
>> >>>> lines", where two houses could share one physical phone line pair,
each
>> >>>> house with its own number.  Disadvantage was that both lines could
not
>> >>>> be used simultaneously.
>> >>>>
>> >>>> http://en.wikipedia.org/wiki/Party_line_(telephony)
>> >>>>
>> >> I think they used to ring between the red green for one party,
yellow 
>> >> green for the other party, black green, etc.
>> > 
>> > No, that would defeat the purpose of the party line.  The ringers 
>> > either had "distinctive ring" (once for Mabel, twice for Maude) or 
>> > were frequency tuned. 
>> > 
>> 
>> They did frequency and distinctive rings. But for 2 parties you can
ring 
>> red-to-ground for one and green-to-ground for the other. It is in
Mike's 
>> Wikipedia link above. My recollection is black was ground and yellow
was 
>> sometimes used for a light in the phone (red and green are phone
wires).
>
>Princess phones used the yellow green pair for the dial light.  A 
>transformer was hidden somewhere in teh house to supply the power 
>(IIRC, a standard 24VAC door bell transformer, but it's been a lot 
>of years).

  6 volts as I recall.  I had one of the transformers around ages ago,
it may still be stashed somewhere.

  Not sure about the pair, though, since green/red is tip/ring of pair
one, black/yellow is tip/ring of pair two.  Putting the transformer
between
green and yellow would be putting the light current on the talk pair,
which would be inviting hum on the line.

  More modern wiring uses:

	colors:
	main/stripe
	-----------
	white/blue	green		tip 1
	blue/white	red		ring 1

	white/orange	black		tip 2
	orange/white	yellow		ring 2

	white/green			tip 3
	green/white			ring 3

	white/brown			tip 4
	brown/white			ring 4

  ( from http://www.ling.upenn.edu/~kurisuto/phone_wiring.html
)


  Similarly, I would question the reliability of ring on a single line
referencing
ground, since party lines tended to be out longer distances -- the ground
resistivity
would make it more difficult to get ring current to the phone(s).

  I think the differing ring frequency would make more sense, since
mechanical
resonance in the ringer provides a reasonable tuning mechanism.


	Alan