DJYVP-300/500V

DJYVP Instrumentation Cable — Polyethylene Insulated, Overall Braid Screened

PE-insulated pairs under one copper braid screen, for analogue and digital runs of a single signal class.

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Lead time15–25 working days
Minimum500 m per size
SampleFree up to 5 m

Illustrative cross section. Construction layers listed below.

Read the code from left to right: D marks the electronic computer and instrumentation family, Y is polyethylene insulation, V is the PVC sheath, and the P written after the sheath letter means the copper wire braid sits over the whole laid-up bundle. That overall screen is the economical choice when every pair in the cable carries the same class of signal — a rack of 4–20 mA loops leaving a control room, or a single digital bus to a remote I/O panel.

Polyethylene is not an incidental detail. With a dielectric constant near 2.3 against roughly 4–6 for PVC, it holds mutual capacitance to about 60 pF/m at 0.5 mm², which is what keeps a 4–20 mA loop within its transmitter load limit and lets an RS-485 segment reach its rated distance. Voltcore twists each pair at a lay length of 40–70 mm, chosen so that consecutive pairs do not share a repeating beat and crosstalk does not accumulate.

Specification

DJYVP 300/500 V — Technical Specification
Item	Value
Rated voltage U0/U	300/500 V
Conductor	Class 2 stranded plain annealed copper, IEC 60228 (Class 1 solid on request)
Number of pairs	1 – 24
Cross-section range	0.5 – 2.5 mm²
Insulation	Polyethylene (PE), dielectric constant ≈ 2.3
Pair twisting	Lay length 40–70 mm, varied between adjacent pairs
Screen	Copper wire braid over the bundle, 80–90 % coverage, with tinned drain wire
Sheath	PVC black; blue for intrinsically safe circuits; LSZH on request
Mutual capacitance at 1 kHz	≤ 60–85 pF/m depending on cross-section
Max. continuous conductor temperature	70 °C
Test voltage	2 kV rms for 5 min (core to core), 1 kV rms (core to screen)
Minimum bending radius	10 × cable overall diameter

Layer-by-layer construction

Listed from the conductor outward. Read this alongside the specification table — the two together tell you whether the cable will survive its installation method.

1. ConductorStranded plain annealed copper, Class 2 to IEC 60228, 7-wire construction
2. InsulationPolyethylene extruded per core at 0.5–0.7 mm wall, colour coded to the pair identification scheme
3. Pair twistingTwo insulated cores twisted with a lay length of 40–70 mm, varied between adjacent pairs
4. Lay-up and binderPairs cabled in concentric layers with fillers and a polyester binder tape over the bundle
5. ScreenCopper wire braid at 80–90 % coverage with a tinned copper drain wire in continuous contact
6. SheathPVC black, 1.2–1.8 mm nominal; blue sheath available for intrinsically safe circuits

Reference dimensions and weights

DJYVP 300/500 V — 4-pair dimensions and weight (reference figures)
Pairs × cross-section (mm²)	Conductor structure (No./mm)	Insulation thickness (mm)	Pair lay length (mm)	Approx. overall diameter (mm)	Approx. weight (kg/km)	Max. DC resistance at 20 °C (Ω/km)	Mutual capacitance at 1 kHz (pF/m)
4×2×0.5	7/0.30	0.5	45	11.2	180	36.0	≤ 60
4×2×0.75	7/0.37	0.5	50	12.4	232	24.5	≤ 65
4×2×1.0	7/0.43	0.6	55	13.8	292	18.1	≤ 70
4×2×1.5	7/0.52	0.6	60	15.3	375	12.1	≤ 75
4×2×2.5	7/0.68	0.7	70	18.1	540	7.41	≤ 85

Reference figures for preliminary sizing and drum planning. Overall diameter and weight vary with strand construction and sheath thickness tolerance; certified drawings are issued with each quotation.

Engineering characteristics

Polyethylene insulation holds mutual capacitance to ≤ 60–85 pF/m, roughly half the value of a PVC pair
Pairs twisted at 40–70 mm lay length with the length varied between pairs to suppress crosstalk buildup
Copper wire braid at 80–90 % coverage over the whole bundle with a tinned drain wire
300/500 V rating, 2 kV rms core to core and 1 kV rms core to screen for 5 min
1 to 24 pairs in 0.5–2.5 mm², so one cable can serve an entire remote I/O drop
Blue sheath option to identify intrinsically safe circuits to IEC 60079-14 practice
Minimum bending radius 10 × overall diameter, which suits dense marshalling racks

Typical applications

4–20 mA analogue loops between field transmitters and a control room marshalling panel
Remote I/O drops where all pairs carry the same signal class
Digital telemetering between RTUs and SCADA master stations
Analogue and pulse wiring inside analyser houses and metering panels
Level, pressure and flow transmitter homeruns on water and chemical plant

Ordering options

DJYPVP: individual pair screens in addition to the overall braid
Blue PVC sheath for intrinsically safe circuit identification
LSZH sheath to IEC 60754-1 and IEC 61034-2
Class 1 solid conductors for fixed installation, or Class 5 for flexible connections
Steel tape or steel wire armour (DJYVP22, DJYVP32) for burial and outdoor runs

Standards manufactured to

GB/T 9330 (construction and test practice)
IEC 60228 (conductor)
GB/T 19666 (flame-retardant grades)
IEC 60332-1-2 (flame propagation)
IEC 60079-14 (installation of intrinsically safe circuits)
RoHS and REACH compliant compounds

Manufactured to other standards on request. Send the standard number with your RFQ and we will quote against it rather than against a near-equivalent.

Price and availability for DJYVP Overall Screened Instrumentation Cable

Include cross-section, core count, voltage grade, route length and installation method — those five determine price more than anything else on the page.

Engineer-reviewed before pricing
Reference drawings issued with the quotation
Free sample up to free sample up to 5 m

or sales@cable-export-manufacture.com · WhatsApp

DJYVP Overall Screened Instrumentation Cable — frequently asked questions

Is DJYVP the same as DJYPVP?

No. In the GB type code the shield letter before the sheath letter V means individual pair screens, and the letter after V means an overall screen. DJYVP therefore carries one braid over the whole bundle; DJYPVP carries a braid over each pair plus a braid over the bundle.

Why polyethylene insulation instead of PVC on an instrumentation pair?

Capacitance. PE has a dielectric constant near 2.3 against roughly 4–6 for PVC, which holds mutual capacitance to about 60 pF/m against 90–130 pF/m. That keeps the loop inside the transmitter load limit and lets long RS-485 segments reach their rated distance.

Can I put a 24 V DC switching circuit and a 4–20 mA pair in one DJYVP cable?

It is poor practice. The overall braid stops interference entering the cable but not interference generated inside it, so a switched inductive load will induce spikes into the analogue pair. Use DJYPVP with individual pair screens, or run the switching circuit in a separate cable.

What pair counts are available and how is the pair identified?

Voltcore supplies 1 to 24 pairs in 0.5–2.5 mm². Pairs are identified by colour combination to a standard sequence, with numbered tape or printed numbering above roughly 10 pairs so that termination crews can identify a pair without tracing it.