The CAP is polarity sensitive, wire negative 24v to the yellow (and blue if you are using 2 BLF's on the one phone) and the positivbe 24V to the black (and White) leads.
If you are thinking of using a SAPS for long loop then you only have to wire the Black/Yellow leads. again polarity sensitive.
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JerryReeve
Communications Systems Int'l
com-sys.com
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