Instrumentation cable with 7 strand concentric, class B bare or tinned copper wire. Two or three conductors are twisted together to form a pair or triad. The individually shielded pairs and triads have a finished lay of 51 mm. Unshielded pairs and triads have staggered lays to prevent electromagnetic interference and cross talk. When specified, pairs and triads are shielded with 100% coverage aluminium/polyester tape and a seven strand tinned copper drain wire is used. The shielding tape is designed to provide total shield isolation from all other shields.