Cable Labelling Standards for KNX Panels: IEC 60445, Colour Codes, and Panduit Labellers
IEC 60445 and HD 308 S2 colour code requirements for KNX panel wiring — phase, neutral, earth, 24VDC, and KNX TP. Panduit MP200 and Brady M611 printer configuration for cable markers, terminal labels, and DIN module identification.
IEC 60445 and HD 308 S2 Colour Codes
European standard IEC 60445 (adopted as HD 308 S2 in the EU) mandates conductor identification in electrical panels. Applied to KNX panels:
| Conductor | Colour | Notes |
|---|---|---|
| Phase L1 | Brown | Or black in older UK installations |
| Phase L2 | Black | |
| Phase L3 | Grey | |
| Neutral N | Blue (light blue, RAL 5015) | |
| Protective Earth PE | Green/yellow bicolour | Never any other colour — mandatory IEC 60445 |
| 24VDC positive | Red or orange | SELV control circuit |
| 24VDC negative / 0V | Blue | Use sleeve label or separate duct to distinguish from AC neutral |
| KNX TP bus (YCYM 2x0.8mm2) | Red sheath; red inner (+), black inner (−) | Red to positive bus (+), black to negative (−). Do not reverse polarity. |
| DALI (2-wire, 16VDC) | Grey sleeve labelled DALI | DALI is polarity-insensitive — no IEC polarity requirement |
| Signal / dry-contact wires | White or yellow, with circuit ID sleeve | Motion sensor, pushbutton, window contact |
Cable Marker Types and Application
Heat-shrink markers (Panduit HSTT or TE Raychem): heat-shrink tube printed with circuit identifier, applied before pulling cable. Best for multi-core cables and cables already terminated.
Push-on plastic flag markers (Phoenix Contact ZB 3 series): clip onto DIN terminals, printed on strip with terminal label printer. Fastest method for terminal blocks.
Self-laminating cable markers (Brady M611 with B-595 label): print circuit ID, wrap around cable. Clear laminate protects text from abrasion and oil. Use on panel-to-field cables. Heat-shrink is preferred for in-duct wiring.
Cable duct label (Panduit MP200 with T100X025VPY perforated stock):applied to cable duct cover for zone and circuit identification.
Labelling Scheme for KNX Panels
Convention for a residential KNX panel serving one villa:
Label format conventions
MCB labels: L[phase][number]-[circuit description]
Examples: L1-01 Lights GF Left
L2-03 Sockets Kitchen
KNX actuators: [type]-[number] [KNX individual address]
Examples: MDT-AKK-01 1.1.5
MDT-JRM-01 1.1.8
Cable ID: [panel-code]/[room-code]/[circuit-number]
Example: MDB/LR/07
= Main Distribution Board / Living Room / circuit 07Critical rule — both ends of every cable get the same label. A cable labelled only at the source end creates troubleshooting delays during commissioning. Label source and destination before pulling the cable through conduit or duct.
Panduit MP200 Printer Setup
Panduit MP200 (thermal transfer, Ethernet + USB, supports ABCDE+ label cartridges): install on the programming laptop. Software: PANDUIT ID Manager for label templates.
Step 1: select label type B-422 (white polyester, 12.7mm height, 38.1mm minimum length) for cable markers. Step 2: create template with circuit ID field, auto-increment by circuit number. Step 3: print all MCB labels, actuator labels, and cable markers for the panel before assembly begins — pre-printed labels save significant time on site.
Brady M611 alternative: portable USB printer for field labelling. Brady Workstation software. Labels: M611-10-732 (white polyester 12.7mm x 50mm). Durable at 105 degrees C — suitable for cables near MCBs.
Dymo LabelWriter 550 (thermal, not thermal transfer): suitable only for room-temperature labels (terminal labels, DIN module labels). Not suitable for cables near heat sources above 60 degrees C — avoid use in the high-voltage zone.
Example Terminal Block Labels
For a KNX panel Zone B terminal strip (24VDC distribution):
Zone B terminal and KNX bus labelling
24VDC distribution terminals (Phoenix ZB 3 push-on labels): Terminal 1: 24V+ (PSU positive in) Terminal 2: 24V- (PSU negative in) Terminal 3: OUT+ (24VDC+ fused out to actuator rail) Terminal 4: OUT- (24VDC- common) KNX bus distribution terminals (WAGO 281 or Phoenix ST 2.5): Terminal +KNX (red label) Terminal -KNX (black label) Panel door internal label — KNX bus polarity reminder: +KNX (red conductor) -> terminal A(+) -KNX (black conductor) -> terminal B(-) (bus coupler terminal designations vary by manufacturer)
Need a professionally labelled KNX panel built to spec?
We apply IEC 60445 colour codes, print all cable markers and terminal labels before assembly, and deliver KNX panels with both-ends cable identification — reducing commissioning time on your site.
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