Legrand CAB 3 Busbar Trunking System 63–250A

The Legrand CAB 3 Busbar Trunking System is a compact, enclosed electrical power distribution system that replaces conventional cable trays and conduit in commercial buildings, industrial facilities, and data centres where frequent tap-off points are required along the length of the distribution run. The 034855 series covers the 160 A rated trunk section — one of the most popular ratings for commercial building lighting and power risers — delivering three-phase and neutral conductors enclosed in a galvanised steel housing rated IP55 for resistance to dust and water jets, suitable for both indoor distribution and outdoor or semi-outdoor routing under canopies and in plant rooms without additional weatherproofing. The system uses an aluminium conductor design for the 63 A to 250 A range, providing an optimal conductivity-to-weight ratio that reduces support structure loading compared to copper alternatives at equivalent current ratings. Pre-assembled section lengths of 0.5 m, 1 m, 2 m, and 3 m are available, with elbow, tee, and offset section variants for three-dimensional routing around structural obstructions in Saudi high-rise projects.

The defining advantage of the CAB 3 system over cable trays is the plug-in tap-off unit (TOU) that connects to any point along the busway run without interrupting power to the downstream sections — a feature that enables live tap-off additions as a building's power requirements grow, which is particularly valuable in office buildings subject to frequent tenant fit-out changes. The tap-off units for the 160 A trunk are available in configurations from 16 A to 63 A, with integral MCB, RCCB, or moulded case circuit breaker protection as required by the downstream circuit. The tap-off box is fixed to the busway housing by a quarter-turn connector that mechanically locks the electrical contacts under 17 Nm torque, preventing contact resistance from increasing under the thermal cycling loads experienced in Saudi Arabia's ambient temperature extremes. The joint between adjacent busway sections uses a bolted copper-faced pressure joint with a protection degree of IP55, maintaining the environmental rating of the complete assembly at every connection.

Saudi Arabia's construction boom — particularly the high-density commercial and residential towers in Riyadh's King Abdullah Financial District expansion, Jeddah Central's mixed-use towers, and NEOM's urban core — demands power distribution solutions that reduce floor-space consumption and adapt to changing tenant needs. Busbar trunking occupies substantially less floor-to-ceiling space than equivalent cable tray installations, and its plug-in flexibility eliminates the rewiring costs associated with tenant changes in leased commercial buildings. The CAB 3 system is favoured by SEC-registered panel builders for vertical riser distribution in multi-storey commercial and residential buildings, where its IP55 rating satisfies the electrical protection requirements at SEC inspection for plant room and riser shaft applications. Major contractor groups including Saudi Binladin Group and Al Bawani use CAB 3 as their standard busway product on commercial high-rise projects, specifying Legrand due to the local stock availability from Razz Middle East and the availability of local engineering support for riser design and coordination with structural and MEP teams.

Razz Middle East holds stock of the most common CAB 3 straight sections, elbows, and tee joints in 100 A, 160 A, and 250 A ratings, with tap-off units available from our Riyadh and Jeddah warehouses for immediate dispatch. Our team provides busbar riser design assistance including short-circuit calculation, voltage drop analysis, and support structure specification, and can prepare complete material take-off schedules for tenders. We provide IEC test certificates, installation instructions, and SEC material approval documentation with every project order.