BS 5308 Part 2 Type 1
PVC/PVC instrumentation cable, overall (collective) screen, unarmoured
BS 5308 Part 2 Type 1 is the British instrumentation cable with PVC insulation, a collective screen and a PVC sheath, unarmoured. Part 2 = PVC insulation (general-purpose, 300/500 V), Type 1 = unarmoured. Also available with individually screened pairs (PiMF); see the datasheets per version.
BS 5308 Part 2 Type 1 with an overall screen (the standard is withdrawn, but BS 5308 is still the usual order designation; near-equivalent to EN 50288-7) is a PVC-insulated, unarmoured instrumentation and process-control cable for measuring, control, signal and alarm circuits. The copper conductors are insulated with polyvinyl chloride (PVC) and stranded into pairs (or triads), which are laid up and enclosed by a single overall (collective) screen of aluminium/polyester foil in contact with a tinned copper drain wire; there are no individual pair screens. A PVC outer sheath protects the cable for fixed installation indoors and outdoors, in cable trays, ducts and trunking. 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. Part 2 (PVC) is the general-purpose +70 °C insulation, as opposed to the PE-insulated Part 1. The overall screen protects the assembled signal pairs against electromagnetic interference; the cable is not intended for power distribution.
Also known as: instrumentation cable
Applications
- Measuring, control, signal and alarm circuits in the process industry.
- PVC-insulated version where the PE variant (Part 1) is not required.
- Projects specified to BS 5308.
What to look out for
- Type 1 = unarmoured. For direct burial or heavy-duty routes choose Type 2 (SWA).
- Collective screen as standard; where crosstalk between pairs is critical, ask for the PiMF version.
- PVC insulation: max. 70 °C conductor temperature, bending radius 6× the outer diameter. Blue sheath for intrinsically safe circuits.
- CPR class Eca. Where the cable is installed permanently in a building and exposed to indoor air, the Bbl requires at least Dca. The wiring inside a control panel or machine is not covered by that requirement, but the cables running to it are.
- Conductor
- Plain (bare) annealed copper, stranded class 5 (0.5 and 0.75 mm²) or stranded class 2 (1.5 mm²) acc. to IEC 60228 / BS 6360.
- Insulation
- Polyvinyl chloride (PVC), type TI1 to BS 6746 (EN 50290-2-22 equivalent).
- Pair/triad
- Two (pair) or three (triad) insulated conductors uniformly twisted together.
- Screen
- Collective (overall) screen of aluminium/polyester foil applied metallic side down over the laid-up elements, in contact with a tinned copper drain wire (0.5 mm²).
- Sheath
- Polyvinyl chloride (PVC), type TM1 or type 6 to BS 6746; black or blue (for intrinsically safe circuits).
- Core identification
- Collective screen: pairs colour-coded to the BS 5308 Part 2 table (pair 1 white/blue, pair 2 white/orange, pair 3 white/green and so on); two pairs as a star quad in black, blue, green and brown. Individually screened pairs: each pair white/blue and numbered, black/blue by agreement. Triads: colour code on request.
- Rated voltage Uo/U
- 300/500 V.
- Test voltage
- 1.0 kV (core/core and core/screen).
- Standard
- BS 5308 Part 2 Type 1 (withdrawn; EN 50288-7 is the current standard); conductor acc. to IEC 60228.
- Flame-retardant
- Acc. to IEC 60332-1-2 (and IEC 60332-3-24).
- Max. conductor temperature
- +70 °C.
- Permitted outer cable temperature, fixed
- −40 °C to +70 °C.
- Min. bending radius, fixed
- 6 × outer diameter.
- Reaction to fire (CPR)
- Eca acc. to EN 50575; Cca on request.
BS 5308 Part 2 or Part 1?
BS 5308 Part 2 Type 1
- PVC insulation
- higher capacitance
Part 1
- PE insulation
- lower capacitance
Part 2 has PVC insulation, Part 1 polyethylene (PE). Both are 300/500 V and allow a conductor temperature of 70 °C. PE gives a lower capacitance, which matters on long HART loops. For ordinary measuring, control and alarm circuits, Part 2 with PVC insulation is the general-purpose choice.
View BS 5308 Part 1 Type 1 →BS 5308 Part 2: Type 1 or Type 2?
BS 5308 Part 2 Type 1
- unarmoured
Type 2
- round steel wire armour (SWA)
Type 1 is unarmoured. Type 2 has a layer of galvanised round steel wires (SWA) under the PVC outer sheath. Insulation and screen are the same. Choose Type 1 on cable trays, in trunking and in ducts, and Type 2 if the cable goes into the ground or may be knocked.
View BS 5308 Part 2 Type 2 →
RE-2X(St)YSWBY
EN 50288-7 instrumentation cable, XLPE/PVC, collective, PiMF or TiMF screen, braid armoured
Lead time: 1–2 working days from stock
In stock: 4×2×1.3
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EN 50288-7 instrumentation cable, XLPE/LSZH, collective screen
Lead time: On request; the lead time is stated in the quote.
RE-2X(St)Y
EN 50288-7 instrumentation cable, XLPE/PVC, collective screen
Lead time: On request; the lead time is stated in the quote.
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