ABB Metal Clad 1 Gang 10AX Intermediate Switch BM119

This switch is suitable for locations where lighting must be controlled from multiple points, such as staircases, corridors, warehouses, workshops, plant rooms, garages, villas, commercial buildings and multi-level construction projects. Its metal-clad construction makes it particularly relevant for demanding indoor environments where a robust accessory is preferred.

The 10AX marking indicates a nominal switching rating of 10 A for lighting circuits, with the AX classification addressing the higher inrush currents associated with certain fluorescent and inductive lighting loads. The connected load, conductor size and protective device must still be selected according to the luminaire manufacturer's data and applicable UAE electrical regulations.

A two-way switch is normally installed at each end of a circuit that controls a light from two or more positions. An intermediate switch is installed between those two-way switches to add a third or additional control location. The ABB BM119 should therefore not normally be used alone as a standard one-way lighting switch.

The 1 gang designation means the switch operates one lighting circuit or one group of luminaires wired as a single circuit. It does not mean that it is limited to one physical lamp; multiple luminaires may be connected where the total electrical load, circuit design and protective device remain within permitted limits.

The BM119 is installed between two compatible two-way switches. The paired strapper conductors from the first two-way switch connect to one side of the intermediate switch, while the outgoing pair connects from the other side to the final two-way switch. Terminal identification and the ABB wiring diagram must be followed because terminal layouts can vary between products.

Yes. The metal enclosure and any exposed conductive components must be connected to the circuit protective conductor using the designated earth terminal. Earth continuity should be maintained throughout the installation and verified by testing before energisation. Installation should be completed by a qualified electrician.

The BM119 is relevant to UAE residential, commercial and light-industrial projects requiring durable multi-point lighting control. Product selection and installation should comply with the current requirements of the applicable local authority, such as DEWA or the relevant emirate's electricity authority, together with project specifications and applicable IEC or BS-based wiring practices.

It may be used to switch compatible LED lighting circuits when the total load and, importantly, the LED driver's inrush current are within the switch manufacturer's permitted limits. For large groups of LED fittings or drivers with high inrush current, an electrician should assess the design and consider using a suitably rated contactor or control device.

Metal-clad construction alone does not confirm weatherproof performance. Unless the product documentation specifies an appropriate IP rating, the BM119 should be installed in a dry, protected location. Outdoor, wash-down or dusty UAE environments may require a suitable IP-rated enclosure or a purpose-designed weatherproof switch.

After isolating and proving the circuit dead, the electrician should confirm conductor identification, terminal tightness, earth continuity, insulation resistance, polarity and correct intermediate-switch operation. The enclosure should be securely fixed, cables should enter through suitable glands or protected knockouts, and no conductor insulation should be trapped or damaged.

It can be used in suitable metal-clad installation arrangements on common construction surfaces, provided the mounting method is secure and appropriate for the substrate. Concrete and blockwork require suitable anchors, while cable entries should be properly aligned and protected. Fixings must not damage concealed services, wiring or waterproofing systems.

Yes, it can be incorporated into a correctly designed conduit installation using compatible cable entries, bushes, glands and accessories. Steel conduit systems require reliable earth continuity, while PVC conduit systems require a dedicated circuit protective conductor. All entries should be finished to prevent abrasion of cable insulation.

Yes. Additional intermediate switches can be installed between the two end two-way switches to provide control from four or more locations. Each intermediate switch must be wired in the correct sequence, and voltage drop, conductor capacity, circuit protection and total lighting load must remain compliant with the project design.

Contractors should confirm the model number BM119, 1 gang configuration, 10AX rating, required number of control locations, wiring topology, mounting arrangement and compatibility with the selected ABB metal-clad range. They should also check project specifications, authority requirements, enclosure needs and the characteristics of the connected lighting load.