Hello, I have a problem, I`m a layman in this topic. I need to connect 3 lamps that are to be connected in series, but I have no idea about it and I would like to consult experts. Is this a series connection?

This means connecting one lamp and two short circuits, keep trying. I suggest something like the above. You`re underestimating the level.

Neither this nor net. Totally wrong. For the first two, you shorted L and N, and how is that supposed to work? When connecting three lamps (24 V), you need a 72 V power supply and where do you get it from? Unless these are 6V bulbs and you WANT to connect them in series? And the power supply is 24 V.

And post #2 doesn`t mean anything to you? There you have the correct serial connection Although this is not entirely correct. Power supply +/- and lamp marking L/N.

Could someone draw me a similar diagram with the correct serial connection? If you think this jet is incorrect?

Thank you very much for your help, I would also like to ask whether this connection is also correct?

If these lamps are light bulbs or simple LEDs with a resistor, a series connection is allowed (pay attention to the polarization of the LEDs!). Lamps with electronics inside should not be connected in series. One of the reasons is the negative dynamic resistance of systems with converters - the voltages will not be distributed evenly, something will get too little, and others will burn out. At 24V, L and N are not marked, where do these markings in your drawings come from? Serial connection.

My friend probably overestimated these LEDs, what about their polarization?

My answer did not take into account the post above because it was not there, I only wrote that a series connection is allowed, of course the polarization of the LEDs must match. I ask again what the L and N markings do there? at 24VDC

If I want to add one lamp to the series connection, can I do it this way?

This is a mixed connection - in parallel (the first two) and the rest in series.

so what should I do to ensure that the additional lamp is also in series? I should add that I cannot connect it in series with the last or first lamp?

Turn it on like the others, in place of (the wire marked in green or yellow) You just need to know that the sum of the voltages of these bulbs must be equal to the supply voltage (this is, of course, when connected in series). When connected in parallel, the voltage of the bulb(s) must be equal to the supply voltage. I will also add that their power, when connected in series, should be the same for all bulbs. Because it may turn out that the supposedly strongest one will not light up at all, or only to a minimal extent.

How to Connect Three 24V Lamps in Series Correctly?

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#1 17178877 20 Apr 2018 19:21

BarToOo1996 BarToOo1996

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Post #1
17178877 20 Apr 2018 19:21

Hello, I have a problem, I`m a layman in this topic. I need to connect 3 lamps that are to be connected in series, but I have no idea about it and I would like to consult experts. Is this a series connection?
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#2 17178883 20 Apr 2018 19:27

krzysiozak krzysiozak

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Post #2
17178883 20 Apr 2018 19:27

This means connecting one lamp and two short circuits, keep trying.

I suggest something like the above.
You`re underestimating the level.
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#3 17178890 20 Apr 2018 19:30

kokapetyl kokapetyl

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Post #3
17178890 20 Apr 2018 19:30

Neither this nor net.
Totally wrong.
For the first two, you shorted L and N, and how is that supposed to work?
When connecting three lamps (24 V), you need a 72 V power supply and where do you get it from?
Unless these are 6V bulbs and you WANT to connect them in series? And the power supply is 24 V.
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#4 17178892 20 Apr 2018 19:31

BarToOo1996 BarToOo1996

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17178892 20 Apr 2018 19:31

Could someone draw me a similar diagram with the correct serial connection? If you think this jet is incorrect?
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#5 17178895 20 Apr 2018 19:33

kokapetyl kokapetyl

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Post #5
17178895 20 Apr 2018 19:33

BarToOo1996 wrote:
diagram with correct serial connection?

And post #2 doesn`t mean anything to you?
There you have the correct serial connection
Although this is not entirely correct. Power supply +/- and lamp marking L/N.
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#6 17178902 20 Apr 2018 19:39

BarToOo1996 BarToOo1996

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17178902 20 Apr 2018 19:39

Thank you very much for your help, I would also like to ask whether this connection is also correct?
#7 17178904 20 Apr 2018 19:40

jarek_lnx jarek_lnx

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17178904 20 Apr 2018 19:40

If these lamps are light bulbs or simple LEDs with a resistor, a series connection is allowed (pay attention to the polarization of the LEDs!).
Lamps with electronics inside should not be connected in series. One of the reasons is the negative dynamic resistance of systems with converters - the voltages will not be distributed evenly, something will get too little, and others will burn out.

At 24V, L and N are not marked, where do these markings in your drawings come from?

Serial connection.
#8 17178910 20 Apr 2018 19:44

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17178910 20 Apr 2018 19:44

jarek_lnx wrote:
If these lamps are light bulbs or simple LEDs with a resistor, then ok

My friend probably overestimated these LEDs, what about their polarization?
#9 17178921 20 Apr 2018 19:49

jarek_lnx jarek_lnx

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17178921 20 Apr 2018 19:49

kokapetyl wrote:
My friend probably overestimated these LEDs, what about their polarization?
My answer did not take into account the post above because it was not there, I only wrote that a series connection is allowed, of course the polarization of the LEDs must match.

I ask again what the L and N markings do there? at 24VDC
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#10 17178955 20 Apr 2018 20:04

BarToOo1996 BarToOo1996

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17178955 20 Apr 2018 20:04

If I want to add one lamp to the series connection, can I do it this way?
#11 17178961 20 Apr 2018 20:07

kokapetyl kokapetyl

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17178961 20 Apr 2018 20:07

This is a mixed connection - in parallel (the first two) and the rest in series.
#12 17178967 20 Apr 2018 20:09

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17178967 20 Apr 2018 20:09

so what should I do to ensure that the additional lamp is also in series? I should add that I cannot connect it in series with the last or first lamp?
#13 17178983 20 Apr 2018 20:16

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Post #13
17178983 20 Apr 2018 20:16

BarToOo1996 wrote:
what to do so that the additional lamp is also in the series

Turn it on like the others, in place of (the wire marked in green or yellow)
You just need to know that the sum of the voltages of these bulbs must be equal to the supply voltage (this is, of course, when connected in series). When connected in parallel, the voltage of the bulb(s) must be equal to the supply voltage.

I will also add that their power, when connected in series, should be the same for all bulbs. Because it may turn out that the supposedly "strongest" one will not light up at all, or only to a minimal extent.
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Topic summary

✨ The discussion revolves around the correct method to connect three 24V lamps in series. The initial query highlights confusion regarding the series connection and the need for expert advice. Responses clarify that connecting three 24V lamps requires a power supply of 72V if they are indeed 24V lamps. It is emphasized that if the lamps are simple LEDs or light bulbs, a series connection is permissible, but caution is advised regarding the polarization of LEDs. The importance of ensuring that the total voltage of the lamps matches the supply voltage when connected in series is also noted. Additionally, a mixed connection scenario is discussed, where one user seeks guidance on adding an additional lamp to the series without disrupting the existing configuration. The consensus is that all lamps in series must have equal power ratings to function correctly.
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FAQ

TL;DR: Connecting 3×24 V lamps in series needs 72 V; as one expert says, "you need a 72 V power supply." Wire + → lamp1 → lamp2 → lamp3 → −, and avoid L/N on 24 V DC. [Elektroda, kokapetyl, post #17178890]

Why it matters: DIYers and students wiring 24 V DC lamps can avoid damage, shorts, or dim lighting by following proven series/parallel rules.

Quick Facts

Series voltage adds: three 24 V lamps require approx. 72 V DC from the supply. [Elektroda, kokapetyl, post #17178890]
Only incandescent bulbs or simple LEDs (with resistors) should be series-wired; lamps with internal drivers should not. [Elektroda, jarek_lnx, post #17178904]
At 24 V DC, label and wire as + and −, not L and N; observe LED polarity. [Elektroda, jarek_lnx, post #17178904]
Mixed wiring (some parallel, some series) is not a pure series string and behaves differently. [Elektroda, kokapetyl, post #17178961]
For series strings, keep bulb power ratings equal to avoid one staying dim or off. [Elektroda, kokapetyl, post #17178983]

How do I wire three 24 V lamps in series correctly?

Connect + from the supply to Lamp 1. Link Lamp 1’s other terminal to Lamp 2. Link Lamp 2 to Lamp 3. Connect Lamp 3 back to −. This is a true series path with no branches. Use + and −, not L and N, on 24 V DC. Verify LED polarity before powering. [Elektroda, jarek_lnx, post #17178904]

What supply voltage do I need for 3×24 V lamps in series?

Use a supply equal to the sum of lamp voltages. For 3×24 V, that is 72 V. Using 24 V will not drive a 3×24 V series string correctly. "You need a 72 V power supply." [Elektroda, kokapetyl, post #17178890]

Can I series-connect LED lamps, or only simple bulbs?

Series wiring is fine for incandescent bulbs and simple LEDs with resistors. Do not series-wire LED lamps that contain internal electronics or drivers. Such converters can exhibit negative dynamic resistance. Voltages will not share evenly, causing misoperation or damage. [Elektroda, jarek_lnx, post #17178904]

What do L and N mean at 24 V, and what should I use?

L and N are AC mains labels and do not apply to 24 V DC. Use + and − for DC wiring. Observe polarity in your diagram and on the device. Incorrect polarity can stop LEDs from lighting. [Elektroda, jarek_lnx, post #17178904]

How do I add one more lamp to an existing series string?

Insert the new lamp where a link currently exists between two lamps.

Pick a wire segment between two series lamps.
Remove that link and connect the new lamp in its place.
Confirm the total lamp voltages equal the supply before powering. This preserves a single series path. [Elektroda, kokapetyl, post #17178983]

My sketch shows two lamps in parallel and others in series—what is that?

That creates a mixed connection. The first two are in parallel, and the remaining ones are in series with that branch. It is not a pure series string. It will not behave like a single three-lamp series chain. Redraw if you need true series. [Elektroda, kokapetyl, post #17178961]

Do all bulbs in a series string need the same power rating?

Yes, keep power ratings the same in a series chain. Unequal ratings can cause uneven voltage drops and brightness. The higher-rated one may stay dim or not light at all. Match ratings to ensure proper operation. [Elektroda, kokapetyl, post #17178983]

How should I orient LEDs in series?

Match polarity on every LED in the chain. Anodes go toward +, cathodes toward −. A reversed LED will block current, and the string will not light. "Pay attention to the polarization of the LEDs!" Check markings before power-up. [Elektroda, jarek_lnx, post #17178904]

Can I power three 6 V bulbs from a 24 V supply in series?

Only if the total equals the supply. Three 6 V bulbs total 18 V, which does not match 24 V. Four 6 V bulbs would total 24 V. Adjust either lamp count or supply so the sums match. [Elektroda, kokapetyl, post #17178983]

Why did my first drawing short L and N?

Two of your “lamps” were actually direct links between supply lines. That created short circuits and left only one lamp effectively in circuit. Redraw as a single series chain without any bypass wires. [Elektroda, krzysiozak, post #17178883]

Can I run 3×24 V lamps from a 24 V supply by wiring in parallel?

Yes, if each lamp’s rated voltage equals the supply, use parallel wiring. At 24 V, connect all three lamps across the 24 V rails. Maintain correct polarity on DC systems. [Elektroda, kokapetyl, post #17178983]

What’s a simple series-wiring check before power-on?

Trace a single path from + through Lamp 1, then Lamp 2, then Lamp 3, to −. Ensure there are no branches or jumpers around any lamp. Use a multimeter’s continuity mode to verify the single path. [Elektroda, jarek_lnx, post #17178904]

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