DJYPV-300/500V

DJYPV Instrumentation Cable — Each Pair Individually Braid Screened

A braid over every pair, so crosstalk between channels stops at the pair boundary.

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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.

In DJYPV the shield letter P comes before the sheath letter V, which in the GB coding means the copper wire braid is applied over each pair rather than over the bundle. Every channel travels inside its own Faraday cage, so a pair carrying a 24 V DC switching circuit cannot inject a spike into the 4–20 mA pair next to it, and a millivolt signal survives alongside a pulse train.

Each pair screen is drained individually. That is the part most installations get wrong: connecting every pair screen to earth at both ends lets a ground potential difference drive circulating current through the screens, which couples into the very conductors the screens are protecting. Voltcore lays a tinned drain wire against each pair braid so that the termination is a single, clean contact rather than a bundle of loose wires.

Specification

DJYPV 300/500 V — Technical Specification
Item	Value
Rated voltage U0/U	300/500 V
Conductor	Class 2 stranded plain annealed copper, IEC 60228
Number of pairs	1 – 24
Cross-section range	0.5 – 2.5 mm²
Insulation	Polyethylene (PE)
Pair screen	Copper wire braid per pair, 0.12–0.15 mm wire, ≥ 80 % coverage, with tinned drain wire
Overall screen	Not fitted as standard; available as the DJYPVP variant
Sheath	PVC black; blue for intrinsically safe circuits
Mutual capacitance at 1 kHz	≤ 60–85 pF/m
Crosstalk attenuation at 1 kHz	≥ 70 dB between adjacent screened pairs
Test voltage	2 kV rms core to core, 1 kV rms core to screen, 5 min
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
2. InsulationPolyethylene extruded at 0.5–0.7 mm wall, colour coded per pair
3. Pair twistingTwo cores twisted together at a lay length of 40–70 mm
4. Pair screenCopper wire braid over each pair at ≥ 80 % coverage, with a tinned copper drain wire laid against the braid
5. Lay-up and binderScreened pairs cabled in concentric layers with fillers and a polyester binder tape
6. SheathPVC black, 1.2–1.8 mm nominal; blue sheath for intrinsically safe circuits

Reference dimensions and weights

DJYPV 300/500 V — 4-pair dimensions and weight (reference figures)
Pairs × cross-section (mm²)	Conductor structure (No./mm)	Insulation thickness (mm)	Braid wire diameter (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	0.12	45	12.0	205	36.0	≤ 60
4×2×0.75	7/0.37	0.5	0.12	50	13.4	265	24.5	≤ 65
4×2×1.0	7/0.43	0.6	0.12	55	14.8	330	18.1	≤ 70
4×2×1.5	7/0.52	0.6	0.15	60	16.4	425	12.1	≤ 75
4×2×2.5	7/0.68	0.7	0.15	70	19.4	600	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

A separate copper braid over each pair, so interference cannot pass between channels inside the cable
Crosstalk attenuation of at least 70 dB between adjacent screened pairs at 1 kHz
Tinned drain wire on every pair for a single-point, low-inductance termination
Polyethylene insulation keeps mutual capacitance at ≤ 60–85 pF/m
300/500 V rating, 2 kV rms core to core and 1 kV rms core to screen
1 to 24 pairs in 0.5–2.5 mm² for dense multi-channel homeruns
Blue sheath and documented capacitance for intrinsically safe entity calculations

Typical applications

Multi-channel analogue racks where 4–20 mA and 1–5 V channels share one cable
Thermocouple and millivolt signal homeruns to a DCS or recorder
Pulse and frequency output wiring from flow meters alongside analogue channels
Analyser houses where low-level signals and solenoid drives occupy the same tray
Test benches and laboratory instrumentation looms

Ordering options

DJYPVP: adds an overall braid over the screened pairs
Aluminium foil pair screen with drain wire in place of braid, for smaller diameter
Blue sheath for intrinsically safe circuits to IEC 60079-14 practice
LSZH sheath to IEC 60754-1 and IEC 61034-2
Armoured DJYPV22 and DJYPV32 for outdoor and direct-buried installation

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)
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 DJYPV Individual Pair 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

DJYPV Individual Pair Screened Instrumentation Cable — frequently asked questions

How is DJYPV different from DJYVP?

DJYPV screens each pair individually and has no screen over the bundle; DJYVP does the opposite. If all channels are the same signal class, DJYVP is smaller and cheaper. If channels of different classes share the cable, DJYPV is the correct construction.

Should each pair screen be earthed at both ends?

No. Earth each pair screen at one end only, normally the control system end, so that a ground potential difference cannot drive circulating current through the screens. Where both ends are required for RF reasons, bond the screens to a common low-impedance earth plane at the panel.

Do I still need an overall screen?

If the cable runs through an area with strong external fields — near a drive, a transformer or a radio transmitter — add the overall braid and specify DJYPVP. Individual pair screens stop internal crosstalk; they are less effective as a barrier against an external field over a long run.

What diameter increase should I allow for pair screens?

Roughly 0.8 mm on overall diameter and 12–18 % on mass compared with the equivalent unscreened-pair construction, depending on pair count. Allow for it when sizing glands; the reference table gives figures for the 4-pair construction.