ACR Y NON ADHERENCE TO ATC CLRNC UNAUTH CLB FROM ASSIGNED ALT RECEIVED TCASII RA CLB FROM VFR SMA HAD LTSS FROM SMA X. PLTDEV. EVASIVE ACTION TAKEN.

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EFP = E FEEDER RADAR; NFR = N FEEDER RADAR. I WAS WORKING EFR. SMA X WAS AT 5000 FT NEBOUND. NFR WAS WORKING ACR Y SWBOUND AT 4000 FT. ACR Y ADVISED HE WAS CLBING FOR TCASII (HE WAS OVER AN AREA WHERE FISH SPOTTER ACFT NORMALLY FLY AT LOW ALTS). THE NFR CTLR ADVISED ME OF ACR Y CLB AND I ISSUED A CLB TO SMA X AND THE REASON FOR CLB. SMA X ADVISED HE HAD ACR Y IN SIGHT AND WAS TOLD TO MAINTAIN VISUAL SEPARATION. SMA X LATER SAID THAT EVEN WITHOUT VISUAL SEPARATION THAT MY INSTRUCTIONS WOULD HAVE AVOIDED A PROB. I FEEL THAT EVEN WITHOUT MY INSTRUCTIONS THE ACFT WOULD HAVE MISSED; BUT NOT BY MUCH AND ON RADAR THE ACFT TARGETS WOULD HAVE TOUCHED. ACR Y REACTED TO A TCASII CLB APPARENTLY FOR TFC BELOW HIM AND CLBED INTO AN ACFT ABOVE AND TO HIS R; CONVERGING. SMA X; IN MY OPINION; SHOULD ALSO HAVE BEEN ON ACR Y'S TCASII. THIS DOESN'T SOUND RIGHT. SUPPLEMENTAL INFO FROM ACN 218061: ACR Y DSNDING FOR LNDG IN LIMITED VISIBILITY VFR CONDITIONS WE WERE ASSIGNED 4000 FT. AT APPROX 4200 FT OUR TCASII REGISTERED AN RA WITH A CLB COMMAND. THERE WAS A VFR WHICH WE HAD JUST SPOTTED WHEN THE TCASII REGISTERED ANOTHER RA; THIS TIME TO 'MONITOR VERT SPD.' AT THIS POINT; WITHOUT US KNOWING IT; WE HAD LOST IFR SEPARATION LIMITS WITH SMA X ABOVE US. THE CTLR TURNED US AWAY FROM THE TFC JUST AFTER THE RA. I FEEL THE VISIBILITY CAUSED VISUAL IDENT OF THE TARGETS TO EXCEED ABILITY OF THE HUMAN EYE UNTIL THE LAST MOMENT. FORTUNATELY THE TCASII SYS SAVED OUR BUTTS THIS DAY AND I AM EXTREMELY THANKFUL WE HAVE THE SYS INSTALLED IN OUR ACFT. WE RELY ON THE TCASII ON A DAILY BASIS.