Unistrand screened signal multicore cable defence standard unistrand 7 2 4c 500m the rapid 7 2 4c defence standard screened signal cable 4 core is a multi core screened type c flexible cable that has an overall polyester tape with a tinned copper wire braid screenit has been manufactured in accordance with defence standard 61 12 part 4 the cable is designed for high density wiring in instrumentation and electronic equipment which includes avionic control systems computers data proc