First-Fix Specification · For M&E Trades

The wiring backbone that future-proofs the whole install.

A first-fix cable specification for luxury residential projects: dual-layer backbone, KNX-ready, local-first. Spec it once, upgrade it for the life of the building.

Get the specification checklist

BS 7671 aligned KNX TP-1 topology 6 install sections

✓ Star-topology backbone ✓ Hybrid & native-KNX paths ✓ Plant-room & enclosure spec ✓ Ready for Phase 1 M&E

Written for the person pulling the cable.

Not a marketing sheet. A working checklist for first-fix, covering the physical infrastructure a certified automation backbone actually needs behind the walls.

DUAL-LAYER BACKBONE

Mains + data, one run

The star-topology backbone that keeps every upgrade path open: centralized relays today, full KNX later, no re-fishing.

TWO SPEC PATHS

Hybrid or native KNX

A default hybrid standard for mains-powered controllers now, plus the native-KNX exception when the client commits from day one.

COMPLIANCE BUILT IN

Separation done right

ELV-to-mains separation, back-box depths, and the 90-degree crossing rule, aligned to BS 7671 and regional codes.

01Core automation infrastructure — KNX bus cable and Cat6/6A home-run topology.
02Architectural lighting control — 4-conductor radial runs and back-box depths.
03Climate, HVAC & M&E — dual-cable thermostat runs and Modbus/KNX gateway drops.
04Ceiling presence & motion — zero-waste power path for bus or mmWave sensors.
05Shading & automated blinds — 4-core flex to every window recess.
06Plant room & enclosure — DIN-rail sizing, dedicated feed, ventilation.

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