Re: Wiring a polarity guard to NE TT Princess with QNB4A2 or QNB4A net.

[RotoTech99]

Dear Forum:

I've encountered some questions about adding a polarity guard to TT NE Princess sets with a QNB4A2/QNB4A networks with a 10 or 12 button dial... I need some guidance/help,  please.

Part of my problem is the QNB4A/QNB4A2 networks doesn't have a slate/black wire going to "C"; all the other connections appear to be there for adding a polarity guard.

So I need guidance/help on what the connections should be, if they are possible,  please.

Attached is a photo of the QNB4A2 network; the QNB4A is similar,  but less one of the L1 terminals.

Any guidance and help please,  is appreciated with Thanks.

BTW: I already have instructions posted on CRPF for adding a polarity guard to NE Princess TT sets with the QNB17A network.

RotoTech99