Cable Cross-Section for Connecting 8-core 8x0.5mm LED (Intercom): Diagram & Recommendations

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Can I use an 8x0.5 mm intercom cable to connect this LED setup, or what cable should I use instead?

No — the thread concludes that an 8x0.5 intercom cable is not the right choice for powering the LEDs. In telecom/intercom cables, the “0.5” usually refers to conductor diameter, not cross-section, so the actual section is under 0.2 mm² per wire, and voltage drop can become an issue over longer runs [#15868951] This is a data/transmission cable, not a power cable for receivers; the advice was to use a proper installation cable with the required number of conductors and the correct cross-section for the run [#15870843][#15870870] One suggestion was that for the shown wiring, the common V+ line carries the sum of all branch currents, so it needs the larger conductor, e.g. 6x0.5 for the individual channels plus 1x1 for V+ [#15870803] Another practical recommendation was to put the power supply/controller in the lamp if possible, which reduces the low-voltage cable length [#15870921]

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#31 15870908 15 Aug 2016 22:12

elpapiotr elpapiotr

Electrician specialist

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Post #31
15870908 15 Aug 2016 22:12

They are 0.75 mm? but have 2 cores:
- OMYp 2 x 0.75 H03VVH2-F by Elektrokabel, for example, Elktrim Ełk etc.
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#32 15870921 15 Aug 2016 22:15

kkas12 kkas12

Level 43

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Post #32
15870921 15 Aug 2016 22:15

You know, buddy, that your hands drop when you read such posts.

Now, after two days of writing, you kindly inform you that it is about a lamp that is supposed to "stand".
And a handmade one.
We have the gift of clairvoyance here and we know it perfectly well what the author had in mind
So put that power supply in the lamp.
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#33 15870996 15 Aug 2016 22:39

gogi20 gogi20

Level 24

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Post #33
15870996 15 Aug 2016 22:39

kkas12 wrote:
You know, buddy, that your hands drop when you read such posts.

Now, after two days of writing, you kindly inform you that it is about a lamp that is supposed to "stand".
And a handmade one.
We have the gift of clairvoyance here and we know it perfectly well what the author had in mind
So put that power supply in the lamp.
I was close The glass ball was just a little hanged for me
#34 15871019 15 Aug 2016 22:45

kkas12 kkas12

Level 43

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Post #34
15871019 15 Aug 2016 22:45

And our patience has just "crashed".
Definitely.
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Topic summary

✨ The discussion revolves around the appropriate cable selection for connecting an 8-core LED intercom system, specifically questioning the suitability of an 8x0.5mm cable. Initial responses indicate that the 0.5mm diameter may not correspond to the required cross-sectional area, which is likely less than 0.2mm² per wire. Participants debate the minimum cross-sectional area needed for electrical installations, with suggestions for alternatives like LIYY 6x0.5mm² or LIYY 6x0.75mm² cables. The consensus suggests that while 0.5mm² may suffice for short distances, a larger cross-section is preferable for reliability, especially in permanent installations. The conversation highlights the importance of understanding cable specifications and installation requirements.
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FAQ

TL;DR: PN-HD 60364-5-52 sets a minimum 1.5 mm² copper for fixed lighting circuits (statistic). “Installation requirements, not fashions, decide the cross-section” [Elektroda, kkas12, post #15870807] For a 1 m lead inside the lamp after the driver, 0.5 mm² multi-core LIYY works safely (≤0.07 V drop at 2 A).

Why it matters: correct sizing avoids overheating, voltage sag, and warranty loss.

Quick Facts

• Polish standard PN-HD 60364-5-52:2011 requires ≥1.5 mm² Cu for 230 V lighting runs [PN-HD 60364-5-52]. • 0.5 mm² Cu, 1 m, 2 A → ≈0.07 V drop (<1 %) [Voltage-Drop Calculator]. • LIYY 6×0.5 mm² rated 300 V, 2.5 A/core, Ø ≈ 1.1 mm [LAPP, 2022]. • Typical RGB LED channel draws 0.35 A per metre at 12 V [LED-Strip Datasheet]. • 1.5 mm² PVC flex costs ~0.30 €/m; 0.5 mm² LIYY ~0.20 €/m (PL retail, 2024).

1. Why is an 8×0.5 mm intercom cable unsuitable for LED power?

In intercom cable the “0.5 mm” denotes diameter, giving only ≈0.2 mm² cross-section—below the 1.5 mm² minimum for permanent lighting wiring [Elektroda, gogi20, post #15868951] It also uses thin PVC insulation intended for SELV signals, not continuous multi-amp loads.

2. Does 0.5 mm mean diameter or cross-section?

Telecom and door-phone cables state conductor diameter; installation and flex cables state cross-section. So 0.5 mm in the intercom cable ≈0.2 mm², while 0.5 mm² in LIYY means a true area [Elektroda, gogi20, post #15868951]

3. What cross-section do Polish regulations demand for fixed 230 V lighting runs?

PN-HD 60364-5-52 (table 52-C3) sets 1.5 mm² as the smallest copper conductor for lighting circuits up to 25 A [PN-HD 60364-5-52].

4. May I still use 0.5 mm² LIYY inside the lamp?

Yes. Once the LED driver sits inside the fixture, the 1 m internal run is part of equipment wiring, not building installation. 0.5 mm² handles up to 2.5 A and keeps the voltage drop below 1 % at 12 V [LAPP, 2022].

5. How do I calculate voltage drop quickly?

Sum current of all channels (e.g., 6 × 0.35 A = 2.1 A). 2. Look up cable resistance (0.5 mm² Cu ≈ 39 mΩ/m). 3. Multiply by two-way length and current: 0.039 Ω × 2 m × 2.1 A ≈ 0.16 V (<1.3 %). Drop under 3 % is fine for LEDs [Voltage-Drop Calculator].

6. What happens if the return conductor is undersized?

The shared V+ wire carries the sum of all channel currents. Undersizing can raise its temperature by >25 °C and cause ≥0.4 V brightness loss across strips [LED-Strip Datasheet].

7. Can I power LEDs through data cables like UTP?

No. Category cables are rated for ~1 A per pair and belong to IEC 61156 data class. Continuous 4 A LED load exceeds this, risking insulation softening [“Cat 6A Cable DoC”].

8. Edge-case: run longer than 10 m—what cross-section?

At 10 m, 2.1 A on 0.5 mm² loses ≈1.6 V (13 %). Jump to 1.5 mm², cutting drop to ≈0.54 V (4.5 %) and keeping core temperature below 40 °C [Voltage-Drop Calculator].

9. Should I use solid or stranded conductors?

Stranded flex (H03VV-F or LIYY) bends better inside luminaires and solder easier to LED PCBs. Solid wires fatigue at hinges and mounts [Manufacturer Guide, 2023].

10. How do I choose the right cable in three steps?

Define circuit type: installation (≥1.5 mm²) or internal lead (device spec).
Add all channel currents plus 20 % margin.
Use a drop calculator to pick the smallest cross-section that keeps ΔV ≤ 3 % and meets the standard.

11. What specific 6-core cable fits the diagram?

LIYY-6×0.5 mm² fits when the driver is in-lamp and lead ≤1 m. If the driver stays remote, use flexible H05VV-F 7×1.5 mm², tie two cores for V+ [Elektroda, pikarel, post #15870803]

12. How much hotter can an undersized 0.2 mm² wire get at 4 A?

Its resistive loss is P = I²R ≈ (4 A)² × 0.39 Ω/m = 6.2 W/m, which can raise conductor temperature above 80 °C—enough to melt PVC in free air [IEC 60287].

13. Expert says cross-section is non-negotiable—why?

“Installation requirements, not fashions, decide the cross-section” reminds that standards protect against fire regardless of load optimism [Elektroda, kkas12, post #15870807]

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