camc for telephone instruments , wiring , cabling and other equipment connected to epabx system - 3 make beetal and model secure b-11 ( general purpose telephone ) 4 make beetal and model secure i - 11 ( general purpose telephone ) 5 make beetal and model p 51 ( general purpose id caller telephone ) 6 wires & cables 7 four core telephone wire each meter 8 20 core telephone cable each meter 9 40 core telephone cable each meter 10 100 core telephone cable each meter 11 200 core telephone cable each meter 12 20 core armed cable per meter 13 100 core armed cable per meter 14 crone connectors 15 pvc conduit pipe 3 / 4 per meter 16 pvc conduit pipe per meter 17 components of telephonic instruments 18 microphone each 19 key pad each 20 bell circuit each 21 dialing ic each 22 voice capsule each 23 display ic 24 line cord 25 coil cord 26 rosettes 27 hook switch