BS 5308 Part 1 Type 2

BS 5308 Part 1 Type 2 is the British instrumentation cable with PE insulation, a collective screen and galvanised steel wire armour (SWA) under a PVC sheath. The counterpart of EN 50288-7 RE-2Y(St)Y SWA. The choice where the cable goes into the ground or may be knocked. Also available with individually screened pairs (PiMF) and with an LSZH sheath; see the datasheets per version.

BS 5308 Part 1 Type 2 with an overall screen (the standard is withdrawn, but BS 5308 is still the usual order designation; near-equivalent to EN 50288-7) is a galvanised-steel-wire-armoured, polyethylene-insulated instrumentation and process-control cable for measuring, control, signal and alarm circuits with high mechanical requirements. The plain copper conductors are insulated with polyethylene (PE) and twisted into pairs (or triads), laid up and enclosed by a single overall (collective) screen of aluminium/polyester foil with a tinned copper drain wire; there are no individual pair screens. A layer of galvanised round steel wires over an inner PVC bedding provides mechanical protection for direct burial and heavy-duty routes, and a polyvinyl chloride (PVC) outer sheath completes the cable. In BS 5308 the Part denotes the core insulation (Part 1 = polyethylene, Part 2 = PVC) and the Type denotes the armour (Type 1 = unarmoured, Type 2 = galvanised steel-wire-armoured); the screening, either an overall (collective) screen only or individual pair screens plus an overall screen, is specified separately. Because Type 2 denotes the armour, this armoured overall-screened construction is Part 1 Type 2. It is the British near-equivalent of EN 50288-7 RE-2Y(St)Y SWA. The cable is not intended for power distribution. The version with individual pair screens and an LSZH sheath is also available with XLPE insulation on request.

Also known as: instrumentation cable