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Many thanks al-yeti

Hello all, I am new to this site so thought I'd introduce myself and ask a question at the same time. I have looked at a friends alarm system as it requires a new ell box. When I took the cable out of the old box it was only 4 core and the new Pyronix bell box requires an extra cable. Can I just use existing 4 core cable and just not connect the strobe?? Will this work?? Many thanks in anticipation.