I did 32 years in telecoms and that never came up, although the 'sacrificial
anode' thing did. As I recall all the switching equipment used a +50v supply
and hence a negative ground. I can't see how a length of copper wire would
lose material with the current flowing in one direction but not the other.
Even with contacts one gets a pit and the other a spike, reverse the direction
and the pits and spike change places, but what do you gain?
PaulH.
----- Original Message -----
... I have been tought,
that phone switching equipment like coils and solenoids should be operated
with the ground connected to the positve power.
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