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2 wire vs 4 wire video intercom

Updated: 22 October 2026

You own a small three-flat building, and the conduit already holds a telephone pair. The hope is that those two conductors will carry a video kit from amazon.co.uk. A 2 wire vs 4 wire video intercom decision is whether that pair belongs to a 2-wire bus, or whether the kit you are looking at wants a different cable entirely. Wire count narrows the choice. It does not prove that two products can share a wall. The monitor kits and their scores stay on the [multi apartment intercom system comparison](/hub/electronic-surveillance/multi-apartment-intercom-system). Listings are from 20 October 2026, with UK notes from Videx, Bticino and Urmet.

You own a small three-flat building, and the conduit already holds a telephone pair. The hope is that those two conductors will carry a video kit from amazon.co.uk.

Our top picks

ANJIELO SMART ANJIELO SMART 7 inch, 3 monitors

Best overall

ANJIELO SMART ANJIELO SMART 7 inch, 3 monitors
5.0/10about £319.99
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LIBO Smart Home LIBO 7 inch, 2 monitors

Rank 2

LIBO Smart Home LIBO 7 inch, 2 monitors
6.4/10about £149.99
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uoweky uoweky 4.3 inch, 3 monitors

Best value

uoweky uoweky 4.3 inch, 3 monitors
5.4/10about £200.99
View offer
On this page
  1. 1.Two conductors are not a four-core kit
  2. 2.What a true 2-wire bus is
  3. 3.What the kept listings actually say about cable
  4. 4.The decision for a three-flat conduit

Two conductors are not a four-core kit

Many marketplace video kits want four or more cores. A true 2-wire bus, such as Videx VX2300, Bticino or Urmet 2Voice, is a different architecture. You cannot turn RVV4 into that bus by using only two of its cores. LIBO B07CQQHTY8 names the cable: a maximum audio and video distance of 100 metres if you use RVV4×1.0, four cores of 1.0 mm². The night-vision line of 100 metres is not that sentence. uoweky B07SX3NY45 does not call itself a two-wire bus. Reviews describe several cores, one adapter per handset, and a cable that would not go through the existing conduit. Hikvision’s UK articles say a 2-wire video intercom can reuse existing copper. That claim is about Hikvision’s system, not a four-core amazon.co.uk kit. J-BSS, updated on 1 October 2026, says wire count narrows the choice and does not prove compatibility.

What a true 2-wire bus is

Videx traditional 4000 and 8000 video uses six wires to each monitor, five common and one for the call. True 2 wire is a separate bus. Six-core Videx video and a marketplace four-core kit are both not a pair, and they are not the same cable. VX2300 publishes maxima of 100 apartments per block and 600 metres for Videx devices on that non-polarised bus. Those limits do not become LIBO’s 100 metre bullet. Bticino allows existing cable only after their compatibility table. One example is 50 metres on 2-core untwisted 0.2 mm cable for one of their segments. They will not guarantee third-party cable. Urmet’s UK 2-wire notes bring in Cat5e. That is Urmet’s architecture, not a core count for these ASINs.
ANJIELO SMART ANJIELO SMART 7 inch, 3 monitors

Testsieger

ANJIELO SMART ANJIELO SMART 7 inch, 3 monitors
5.0/10about £319.99
View offer

What the kept listings actually say about cable

You cannot fill a silence from a neighbouring ASIN. Kadongli B07RJR9HJW says wired and no internet in the title, while the specification block says Wi-Fi. It states no core count. A different Kadongli listing says 4-core. That ASIN is not in this comparison. ANJIELO SMART B0D3HR83HJ says wired and does not say 2-wire or 4-wire. ANJIELO SMART B0FXG9R1ZL says wired and Ethernet. Other ANJIELO pages that say 4-wire connection are not these two ASINs. None of the five claims a 2-wire bus. Weather and privacy do not change the conductor count. Those questions sit on the buying guide.

The decision for a three-flat conduit

If the cable in the wall is one pair, the kept marketplace kits are the wrong architecture. Pull a new cable the listing names, and stop if the conduit cannot take it. Or ask an installer about a 2-wire bus designed for a pair: Videx, Bticino, Urmet, or another bus whose own instructions allow that pair. A dead flat on an existing Videx, Bticino or Urmet system is the installer’s job. The order of pulling a new cable is on the install page. Which box states two or three monitors is on the best kits page. Keep the pair only for a bus built for a pair.

Common questions

What is the difference between a 2-wire video intercom and a 4-wire kit?
A 2-wire video intercom, in the UK trade sense used by Videx, Bticino and Urmet, is a bus that carries the system on one pair and addresses each device. A 4-wire kit is a model-specific run. LIBO’s listing is the clear marketplace example here: RVV4×1.0, four cores of 1.0 mm², for a stated audio and video distance. Sharing the word wire does not make them interchangeable.
Will the old telephone pair in a three-flat house carry a marketplace video kit?
Not the kits kept in this comparison. LIBO asks for RVV4×1.0. uoweky reviews describe several cores and a conduit that would not take the cable. The other three listings do not claim a 2-wire bus either. A pair can serve a bus whose maker says that pair is suitable. If you cannot pull a new cable, leave the marketplace box.
Is Videx true 2-wire the same thing as two cores in a four-core cable?
No. Videx uses true 2 wire for a bus. Its traditional video ranges use six wires to each monitor. Two cores inside an RVV4 cable are simply two of four conductors in a different scheme. Using two of them is not how you convert a marketplace kit into VX2300.
Can I use Videx’s 100-apartment or 600 m figure on an amazon.co.uk kit?
No. Those maxima are published for VX2300 devices on that non-polarised bus. Bticino’s table, including a 50 metre example on one of their cable types, is likewise theirs, and they do not guarantee third-party cable. LIBO’s 100 metres applies only where you use the RVV4×1.0 the bullet names.
What if the conduit will not take a thicker cable?
You stop forcing it. A uoweky review already records a cable that would not pass the existing conduit. A new route, or trunking beside the old tube, is the physical answer if you stay with a multi-core kit. If the conduit is the only route you are allowed to use, a 2-wire bus is the conversation to have with an installer.

Related pages

Multi-apartment intercom lock release

Multi-apartment intercom system

Best multi apartment intercom system by flat count

UK multi apartment intercom buying guide for flats

How to install a multi apartment intercom in a house

Sources

Public UK sources from the digest first, then the amazon.co.uk listings compared on this page. Prices and stars were taken on 20 October 2026. A search-snippet price from that day is context only.

  1. Videx, wired video intercoms (retrieved 20 October 2026)
  2. GAI, access control specifiers' guide, September 2024 (retrieved 20 October 2026)
  3. Citizens Advice, asking for adjustments (retrieved 20 October 2026)
  4. Equality Act 2010, explanatory notes (retrieved 20 October 2026)
  5. Shelter England, landlord responsibilities for improvements (retrieved 20 October 2026)
  6. Secured by Design, homes guide excerpt (retrieved 20 October 2026)
  7. Approved Document P (retrieved 20 October 2026)
  8. ICO, home CCTV systems (retrieved 20 October 2026)