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Shmason · 10th Jun 2019, 9:14 am

Sorry, to clarify terminals 2 and 4 of main TB are +ve.

On ring converter, 4 is +ve when extn to exch is depressed and call main is pressed from an extension and polarity changes and 5 becomes +ve when all plinth buttons released and call main pressed from an extension.

10th Jun 2019, 9:14 am	#38
Shmason Retired Dormant Member Join Date: Jun 2019 Location: Leek, Staffordshire, UK. Posts: 21	Re: GPO planset with external extensions Sorry, to clarify terminals 2 and 4 of main TB are +ve. On ring converter, 4 is +ve when extn to exch is depressed and call main is pressed from an extension and polarity changes and 5 becomes +ve when all plinth buttons released and call main pressed from an extension.