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

malojk 30054 33
Best answers

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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  • #1 15867374
    malojk
    Level 12  
    Hello!

    Which cable should be used to connect the LED as shown in the diagram below? I bought an 8x0.5mm (intercom) 8-core cable, but will it be ok?
    Cable Cross-Section for Connecting 8-core 8x0.5mm LED (Intercom): Diagram & Recommendations
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  • #2 15867412
    kkas12
    Level 43  
    Not.
    It won't be ok
  • #3 15867417
    malojk
    Level 12  
    How will it be ok? I am interested in a 6-wire cable so that I could lead it out of the lamp in one cable. There is something like that ??

    I found something like this: YLYS: 6x0.6 + 1x1; 6x1 + 1x1.5; 7x0.75; 7x1; 7x1.5, YLYS 7 x 0.75 + 1 x 1 mm
    LIYY 6x0.75

    which will be the right one ??
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  • #4 15868775
    malojk
    Level 12  
    From what I have read, the cross-section of 0.5 mm2 will probably be ok. Please confirm, or so?
  • #5 15868950
    rumcajs2
    Level 14  
    kkas12. You are a moderator, so explain why it will not be appropriate? Isolation breakdown voltage or maybe the conductor cross-section is too small?
  • #6 15868951
    gogi20
    Level 24  
    Only that the cores of this 8x0.5 (intercom) cable are most likely 0.5 mm in diameter and not 0.5 mm2 in cross-section. In telecommunications cables, the diameter of the conductor is given, not the cross-section (I don't know if all of them). You will have a cross-section of less than 0.2 mm2 per wire. I don't know what the moderator means but he has to endure it. The only obstacle may be the voltage drop if the distance between the controller and the lamp is long.
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  • #7 15868982
    rumcajs2
    Level 14  
    Even 0.2mm2 has a load capacity several times greater than 350mA. I do not have a table at hand, but I do not like the answer. "No.
    It won't be ok. "Without explaining why?
  • #8 15869001
    retrofood
    VIP Meritorious for electroda.pl  
    rumcajs2 wrote:
    Even 0.2mm2 has a load capacity several times greater than 350mA. I do not have a table at hand, but I do not like the answer. "No.
    It won't be ok. "Without explaining why?

    So find out what the minimum cross-sectional area for wiring in electrical installations is and stop spamming. Do you have to give lectures every week?
  • #9 15869012
    gogi20
    Level 24  
    retrofood wrote:
    rumcajs2 wrote:
    Even 0.2mm2 has a load capacity several times greater than 350mA. I do not have a table at hand, but I do not like the answer. "No.
    It won't be ok. "Without explaining why?

    So find out what the minimum cross-sectional area for wiring in electrical installations is and stop spamming. Must lectures be held every week?
    It should be added that this applies to permanent installations. If he gives the driver in the lamp, it will be ok.
  • #10 15869027
    rumcajs2
    Level 14  
    retrofood. Read this http://perunwit.w.interiowo.pl/obcp.html. So according to you to install an infrared camera there should be a cable. What? This table is at hand.

    Moderated By Łukasz-O:

    The load capacity is only one of the parameters of the cable selection.
    3.1.11. Posting non-substantive posts with harmful advice, non-troubleshooting advice, and posting identical posts that replicate or repeat information from discussions.

  • #11 15869030
    sosarek

    Level 43  
    rumcajs2 wrote:
    So according to you to install an infrared camera should be a cable. What?

    What does that have to do with this topic because I don't understand?
    The lighting installation is not a camera.
    Company Account:
    Z
    Pka, Poznań, 60-850
    Helpful post? Buy me a coffee.
  • #12 15869031
    rumcajs2
    Level 14  
    There are also lighting diodes. (Infrared). I power them via twisted-pair. To finish it.

    Moderated By Łukasz-O:


    3.1.13. Publishing entries that violate the spelling rules of the Polish language, careless and incomprehensible.
    3.1.11. Posting non-substantive posts with harmful advice, non-troubleshooting advice, and posting identical posts that replicate or repeat information from discussions.

    Warning # 1.

  • #13 15869100
    malojk
    Level 12  
    But which one will be ok? Ten 8x0.5 mm?
    I found two such cables: LIYY 6x0.5mm2 or
    LIYY 6x0.75mm2
    Will they be ok to connect the entire layout? I will add that the controller will be outside the lamp at a distance of about 1m. I can not find wires with such a cross-section, but there should be a wire in a single strand. Are they like that?
  • #14 15870255
    malojk
    Level 12  
    Will someone answer? Which of the above cables should I buy? 0.75 mm2 is it enough 0.5 mm2?
  • #15 15870587
    kkas12
    Level 43  
    A power supply with "efficiency" 4A and a cable with a diameter of about 0.2mm.
    What else to translate ???

    A cross-section (minimum) of cables used in installations is a requirement, while the choice of luminaires and light sources is a "fad" (often depending on the current fashion) having nothing to do with the requirement.
  • #16 15870614
    maurycy123
    Conditionally unlocked  
    kkas12 wrote:
    A power supply with "efficiency" 4A and a cable with a diameter of about 0.2mm.
    What else to translate ???
    A power plant with a "capacity" of 20GW (example) and I have stupid wires in my apartment "only" 1.5mm2 and 2.5mm5. Maybe instead of getting smart, you would write something specific? More is required of a moderator than a regular user.
  • #17 15870622
    jann111
    Level 33  
    maurycy123 wrote:
    A power plant with a "capacity" of 20GW (example) and I'm stupid

    You really have to be dumb to get hard on the power plant.
  • #18 15870649
    maurycy123
    Conditionally unlocked  
    jann111 wrote:
    maurycy123 wrote:
    A power plant with a "capacity" of 20GW (example) and I'm stupid

    You really have to be dumb to get hard on the power plant.
    You didn't understand the sarcasm. You probably don't know what the difference between LEGO bricks and sex is. Therefore, keep playing with blocks.

    Moderated By kkas12:

    3.1.9. Do not be ironic and do not be malicious with the other side of the discussion. Please respect dissenting opinion and other opinions in the forum.
    3.1.11. Don't post messages that add nothing to the discussion. They are misleading, dangerous or do not solve the user's problem.

    Thirty days of "vacation".

  • #19 15870680
    malojk
    Level 12  
    kkas12 wrote:
    A power supply with "efficiency" 4A and a cable with a diameter of about 0.2mm.
    What else to translate ???

    A cross-section (minimum) of cables used in installations is a requirement, while the choice of luminaires and light sources is a "fad" (often depending on the current fashion) having nothing to do with the requirement.


    LIYY is 0.5mm2 x6 suitable or not? Do you take 6x 0.7mm2? What diameter is 0.2mm?
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  • #21 15870727
    malojk
    Level 12  
    I understand or I do not understand that it will not be suitable. What should I apply? I'm already lost
  • #23 15870775
    malojk
    Level 12  
    well, I read, but I don't know what to attach my diagram to ...
    according to calculator: Link

    it comes out that 0.5mm2 is enough. how is it? some say that it will be ok and acc. of these tables, I would have to pull the 6x1.5mm2 cable to these LEDs?
  • #24 15870803
    pikarel
    Level 39  
    malojk wrote:
    Hello!

    Which cable should be used to connect the LED as shown in the diagram below? I bought an 8x0.5mm (intercom) 8-core cable, but will it be ok?

    The sum of all currents in the branches will flow in the red wire, so the appropriate wire will be 6x0.5 (individual channels, one wire will be free) + 1x1 (Output V +).

    Moderated By kkas12:

    3.1.11. Don't post messages that add nothing to the discussion. They are misleading, dangerous or do not solve the user's problem.

  • #25 15870807
    kkas12
    Level 43  
    You are to do installation between the power supply and the light source!
    Installation !!!
    And you are bound by the installation requirements and not the inventions of the ingenious Dobromir under the slogan enough or not enough .
  • #26 15870833
    malojk
    Level 12  
    But we are talking now about the cable from the beginning of the topic, i.e. 8x0.5mm (not the cross-section)? I do not get it 1x1, link two wires for V +?

    And this one will be ok: LIYY is 6x0.5mm2 (cross-section) ??

    edit.

    what about this calculator?
  • #27 15870843
    kkas12
    Level 43  
    This is a data transmission cable, not for powering receivers !!!
    And in its declaration of conformity it is written:
    Quote:
    We declare that the products from the batch specified in point 5 are compliant with the reference documents mentioned in point 4
    (including all changes and additions) on condition that they are used in accordance with their intended purpose and with the applicable standards and technical recommendations.
  • #28 15870863
    malojk
    Level 12  
    So please give me a specific model, I'm looking for a whole day ... I'm not an electrician. I will ask again and you can close the topic. What is the best 6-wire (what cross-section?) Cable to buy for a specific diagram from the beginning of the post?
  • Helpful post
    #29 15870870
    kkas12
    Level 43  
    You insisted on the cable (not the cable, but rather the cable).
    Pull the appropriate number of wires with the correct cross-section into the conduit and you will have the "problem" solved.
  • #30 15870885
    malojk
    Level 12  
    well, what kind of cross-section to use? there is nothing specific on the market? if there are no 6 wires then maybe 3 wires though.

    ps. the lamp is to stand in the living room so the conduits are probably falling off :)
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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?

  1. 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?

  1. Define circuit type: installation (≥1.5 mm²) or internal lead (device spec).
  2. Add all channel currents plus 20 % margin.
  3. 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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