KNX cable is a twisted-pair bus cable that carries power and data for the devices on a KNX line. The recommended types are YCYM 2 x 2 x 0.8 and J-Y(St)Y 2 x 2 x 0.8.

What is the maximum KNX cable length?

One line allows up to 1000 m of cable in total, 350 m from the power supply to the furthest device and 700 m between any two devices.

How many devices can be on one KNX line?

Up to 64 devices with a 640 mA power supply. A line takes no more than two power supplies, at least 200 m apart.

Can I use Cat6 cable instead of KNX cable?

It is not recommended. A KNX-certified bus cable is recommended, and KNX terminals are specified for 0.6 to 0.8 mm single-wire conductors. Use Cat6 for the network and KNX cable for the bus.

What size is KNX cable?

The recommended types are 2 x 2 x 0.8, which means two twisted pairs of 0.8 mm solid conductor.

Where can I get KNX cable in India?

Tell Morion Automation the length and cable type your integrator specifies. We will say whether we can supply it or point you to the right route. Call +91 90303 44479 or write to info@morion.in.

Guide

KNX cable in India: bus cable specs, length limits and installation

Every KNX device on a line shares one twisted-pair bus cable that carries both power and data. The cable type, the line length and the number of devices all have limits, and they are set when the project is planned. This guide sets them out with sources.

What KNX bus cable is

KNX twisted pair (TP) wiring carries both power and data for every device on a line. The bus runs at 30 V DC SELV, supplied by a KNX power supply in the distribution board¹. ABB recommends a certified KNX bus cable and gives YCYM 2 x 2 x 0.8 and J-Y(St)Y 2 x 2 x 0.8 as examples of the cable types². Morion Automation supplies the KNX devices; for cable, see the end of this page.

KNX cable limits for one line

KNX TP line limits
Limit	Value	Source
Devices on one line	Up to 64 with a 640 mA power supply	Ekinex datasheet
Power supply to the furthest device	Up to 350 m along the cable	Ekinex datasheet, ABB manual
Between any two devices	Up to 700 m	Ekinex datasheet, ABB manual
Total cable on one line, all branches	Up to 1000 m	Ekinex datasheet, ABB manual
Between two power supplies on a line	At least 200 m, and no more than two supplies on one line	ABB manual, Ekinex datasheet
Topology	Line, star or tree. A ring is not possible.	ABB manual
Bus voltage	30 V DC SELV	Ekinex datasheet

The 350 m figure is measured along the cable from the power supply to the furthest device. A line can branch, but all the branches together stay within 1000 m¹². If the total is more than one line can carry, the project adds lines with line couplers.

KNX cable and Cat6: why they are not interchangeable

KNX bus cable compared with Cat6 network cable
	KNX bus cable	Cat6 network cable
Purpose	Made for the KNX bus: carries bus power and data on one pair.	Made for network data.
Conductor	Solid conductor of 0.8 mm in the recommended 2 x 2 x 0.8 types.	Generally thinner than the 0.6 to 0.8 mm solid conductor that KNX bus terminals are specified for.
KNX recommendation	The recommended types are YCYM 2 x 2 x 0.8 and J-Y(St)Y 2 x 2 x 0.8.	Not a recommended KNX bus cable.
Verdict	Use a KNX-certified bus cable.	Not recommended for the KNX bus.

Installers sometimes ask whether spare network cable can carry the bus. The recommendation is a KNX-certified cable², and the terminals on KNX devices and power supplies take single-wire conductors of 0.6 to 0.8 mm¹. Use Cat6 for the network and a KNX cable for the bus.

Planning and installing KNX bus cable

Draw the lines first. Decide which devices sit on which line and where each power supply goes, so no line passes 64 devices or 350 m from its supply.
Avoid rings. A KNX line is a line, star or tree. A loop is not possible.
Use the right terminals. Strip about 5 mm and clamp the single-wire conductor in the red and black KNX bus terminal.
Keep the sheath distinct. Where a second 30 V DC auxiliary output is used, use a differently coloured sheath from the bus cable so the two are not mixed up.
Label both ends. Mark the line number at the board and at each device.
Follow the electrical code. Ask your KNX-certified integrator how the bus cable should be separated from mains cables on your project.

KNX cable price in India

The price depends on the cable type, the length and how it is supplied. Morion does not publish a price list for KNX cable. Send us the length and the cable type your integrator specifies and we will tell you whether we can supply it or point you to the right route. Call or WhatsApp +91 90303 44479, write to info@morion.in, or book a consultation.

For the devices on the bus, see the KNX guide for India, the MDT KNX catalogue and MDT KNX actuators.

Ekinex, 640 mA KNX power supply datasheet (device and line limits, 30 V DC SELV, terminals for 0.6 to 0.8 mm conductors).
ABB, KNX system manual (in Turkish): cable types, line topology, 1000 m, 350 m, 700 m and 200 m limits, no rings.

Last updated 22 October 2026 by Morion Automation.