When we think about building design, electrical services are often taken for granted. We expect the lights to turn on, equipment to operate, and critical systems to remain available when needed. Behind this reliability lies a carefully planned electrical infrastructure designed to distribute power safely, efficiently and resiliently throughout a building.
Where Electrical Design Begins
Every electrical design starts with understanding a building's power requirements. Before switchboards, cables or substations can be designed, engineers must estimate the anticipated electrical demand.
This process considers a range of factors, including lighting, small power requirements, mechanical plant, heat pumps, electric vehicle charging and future expansion capacity. Accurate load estimation is critical because it influences utility connection requirements, electrical infrastructure sizing, plant space requirements and overall project costs.
As buildings become increasingly electrified, getting this stage right has never been more important.
The Impact of Electrification
The transition away from fossil fuels is fundamentally changing how buildings consume energy. Technologies such as heat pumps, electric hot water systems and EV charging infrastructure are significantly increasing electrical demand compared to traditional buildings.
A building that previously relied on gas-fired systems may have relatively modest electrical requirements. Once those systems become fully electrified, the required electrical capacity can increase dramatically.
This shift can have major implications for a project's electrical infrastructure, potentially requiring larger utility connections, dedicated substations, increased cable routes and greater coordination between disciplines. Early planning is therefore essential to avoid costly redesigns later in the project lifecycle.
Understanding Medium and Low Voltage Networks
Electrical power reaches buildings through a hierarchy of infrastructure.
For smaller developments, a direct connection to the local low-voltage (LV) network may be sufficient. Larger developments, however, often require a medium-voltage (MV) connection, with power supplied through a dedicated substation and transformer before being distributed throughout the building.
Understanding the relationship between MV and LV systems is an important part of determining the most appropriate electrical strategy for a project. The larger the demand, the greater the likelihood that dedicated infrastructure will be required.
Building Resilience Through Backup Power
Reliable buildings require more than a utility connection. Many facilities must continue operating during power interruptions, making resilience a key consideration in electrical design.
Two of the most common resilience solutions are Uninterruptible Power Supplies (UPS) and standby generators.
UPS systems provide instantaneous backup power and are typically used to support servers, communications equipment, security systems and building control systems. Because they respond immediately, they prevent critical equipment from experiencing even a momentary interruption.
Standby generators, meanwhile, provide longer-duration backup power. While they typically require several seconds to start, they can support life safety systems, firefighting lifts, emergency ventilation systems and other critical building functions during extended outages.
In many buildings, both systems work together, with the UPS bridging the gap until the generator comes online.
How Power Is Distributed
Once power enters a building, it is distributed through a structured hierarchy of equipment.
At the heart of the system is the Main Switchboard (MSB), which receives incoming power and distributes it throughout the building. Sub-Distribution Boards (SDBs) then serve specific zones or areas, while Distribution Boards (DBs) provide final circuit protection and distribute power to lighting, sockets, equipment and mechanical systems.
This layered approach ensures power can be delivered safely and efficiently while maintaining flexibility for future changes and maintenance.
The Importance of Coordination
Electrical services design extends far beyond cables and switchboards. Electrical infrastructure must be coordinated with architectural, structural and mechanical systems to ensure adequate space, accessibility and maintainability.
From risers and plant rooms to roof-mounted equipment and containment routes, successful electrical design depends on close collaboration across all disciplines.
Designing for the Future
As buildings become smarter, more connected and increasingly electrified, electrical infrastructure is playing a more significant role than ever before.
Effective electrical design is not simply about supplying power. It is about creating safe, resilient and future-ready buildings that can adapt to changing technologies, sustainability goals and occupant needs.
By understanding the fundamentals of electrical services, project teams can make better-informed decisions, reduce risk and deliver buildings that perform effectively throughout their lifecycle.
At IN2, our multidisciplinary teams work collaboratively to develop integrated electrical solutions that support performance, resilience and long-term value for our clients.