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Old 3rd Jun 2019, 4:46 pm   #2
TonyDuell
Dekatron
 
Join Date: Jun 2015
Location: Biggin Hill, London, UK.
Posts: 3,769
Default Re: Gpo planset with external extensions

My first thought (without really working through the circuits) is the 'earth' connections. Each extension needs to be earthed, so does the planset _and it depends on the 'a' wire of the telephone line being earthed at the exchange_.

You can simply link the earths together, and back to the A wire (using 3 core cable to the extensions) rather than using true earth (which may cause problems if your telephone line is wired the other way round).
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