Low Voltage Switchgear & Main Distribution Boards

Low Voltage Switchgear & Main Distribution Boards (LV Switchgear & MDB)

Perfect Solution Contracting provides integrated Low Voltage (LV) switchgear and Main Distribution Board (MDB) solutions for electrical power distribution, protection, control, and monitoring in commercial buildings, industrial facilities, infrastructure projects, data centers, and other critical facilities.

LV switchgear and MDBs form key distribution points within an electrical network. They can receive power from transformers, generators, or other approved sources and distribute it to downstream distribution boards, equipment, and electrical loads through appropriate switching and protective devices.

Our scope can include engineering coordination, technical and material submittals, equipment supply, installation, cable and busduct connections, earthing, inspection, testing, commissioning, and final handover according to approved project requirements.

Switchgear selection should consider the system operating voltage, rated current, busbar capacity, prospective short-circuit current, protection requirements, number and rating of feeders, enclosure arrangement, degree of protection, cable entry requirements, and operational and maintenance needs.

Assemblies can incorporate Air Circuit Breakers (ACB), Molded Case Circuit Breakers (MCCB), and other switching and protective devices according to the feeder ratings, system configuration, and approved electrical design.

Circuit breakers and protective devices are selected according to load characteristics, fault-current levels, conductor protection requirements, and the protection functions required by the electrical distribution system.

Protection coordination and selectivity should be considered between upstream and downstream protective devices. Breaker characteristics and protection settings are coordinated according to the approved protection study and project requirements.

Main busbars are a critical part of the assembly and should be rated for the required continuous current and short-circuit conditions. Busbar material, sizing, arrangement, supports, joints, and temperature-rise performance are determined by the approved assembly design and manufacturer requirements.

The short-circuit withstand capability of the switchgear assembly, busbars, and associated devices should be coordinated with the prospective fault current at the point of installation. Required ratings are determined from the approved electrical design and short-circuit study.

LV switchgear and MDBs can also incorporate electrical metering and monitoring equipment for parameters such as voltage, current, frequency, power, energy, and power factor, depending on the project requirements.

Current Transformers (CTs), multifunction meters, transducers, and other monitoring components can be incorporated where required by the approved design.

Auxiliary and control circuits can include selector switches, push buttons, indication lamps, relays, alarms, control wiring, and other components required for the intended operating sequence and functionality of the switchgear.

Where specified, switchgear can provide communication interfaces or monitoring points for integration with a Building Management System (BMS), Electrical Power Monitoring System (EPMS), or other approved supervisory systems.

Internal separation within the switchgear assembly can be configured according to the required Form of Separation specified for the project. The selected arrangement defines the required separation between busbars, functional units, and external conductor terminals.

The enclosure degree of protection (IP Rating) is selected according to the installation location and environmental conditions. Indoor and outdoor installations can require different enclosure arrangements depending on exposure to dust, moisture, water, and other environmental factors.

Ventilation and thermal management should follow the approved assembly design and manufacturer requirements. Required working clearances around the equipment should also be maintained to support safe operation, inspection, and maintenance.

The switchgear assembly includes appropriate earthing arrangements and an earth bar for bonding the metallic enclosure and relevant components to the facility earthing system according to the approved electrical design.

Feeders, circuit breakers, switches, control devices, and other components should be clearly identified using labels and nameplates in accordance with the approved drawings, schedules, and project identification requirements.

Incoming and outgoing cable or busduct arrangements are coordinated with the switchgear location and approved electrical routes. Top-entry or bottom-entry arrangements can be provided according to the panel design and site requirements.

Cable connections can include suitable glands, lugs, termination accessories, supports, and associated hardware selected according to the cable type, conductor material, conductor size, equipment terminals, and installation environment.

Before manufacturing project-specific assemblies, technical documentation can include shop drawings, Single Line Diagrams (SLD), general arrangement drawings, component schedules, protection details, and technical data for review and approval according to the project procedure.

Where required by the project specification, a Factory Acceptance Test (FAT) can be performed before delivery to verify the assembly configuration, installed components, wiring, mechanical operation, protection and control functions, and specified electrical tests.

Following installation, pre-energization inspection and testing can include visual and mechanical inspection, verification of connections and specified torque values, insulation resistance, continuity, earthing, phase sequence, breaker operation, control circuits, indications, interlocks, and protection functions according to the approved testing procedure.

Site Acceptance Testing (SAT) and functional testing can also be performed where required to verify the installed equipment and its integration with the electrical distribution system before final handover.

Low-voltage switchgear assemblies should be selected, manufactured, verified, installed, and tested according to the approved project specifications, manufacturer requirements, and applicable standards. Depending on the project and assembly type, relevant requirements may include IEC 61439-1 and IEC 61439-2, together with other applicable project requirements and certifications.

Perfect Solution Contracting provides complete LV Switchgear & MDB solutions covering engineering coordination, technical submittals, equipment supply, installation, cable and busduct connections, earthing, inspection, testing, commissioning, and final handover according to project requirements.