An electrical panel board is a collective term for different types of electrical enclosures used to distribute and control electricity, including distribution boards, switchboards, and control panels.
All electrical panel boards receive power from an upstream source such as a transformer or switchgear and distribute it into smaller branch circuits. For example, a switchboard typically manages larger loads and then feeds distribution boards, which supply lighting, appliances, and equipments.
Electrical panel boards are used across a wide range of industries. Mission critical facilities like data centres and infrastructure like airports rely on higher capacity systems such as low voltage switchgear to ensure uninterrupted power. Meanwhile, commercial and industrial buildings usually operate on lower capacity requirements, where power flows from a switchboard down to distribution boards to support everyday equipment and building operations.
What is an Electrical Panel Board and How Does It Work?
Inside an electrical panel board, power is organised and controlled so that different parts of a building receive electricity safely and reliably. When electricity enters the panel, the main circuit breaker acts as the master switch, where you can control the entire switchboard that allowing you to shut off power to the entire board when needed. From there, electricity is routed to multiple branch circuit breakers, each dedicated to a specific area or function such as lighting, Heating, Ventilation, and Air Conditioning (HVAC), or individual equipment. These breakers automatically trip if a circuit becomes overloaded or faulty, preventing electrical fires or damage.
The panel also includes essential components such as neutral and ground busbars for safe return paths and grounding, as well as clearly marked circuit labels for easy identification. Together, these parts ensure the panel board operates as a safe, organised, and user-friendly hub for managing electricity throughout the building.
Types of Electrical Panel Boards
Electrical panel boards vary not just in shape or size but in their function, configuration, and protection standards.
At Cantal, every board we manufacture should deliver maximum safety, reliability, and efficiency, fully aligned with the latest IEC 61439 Ed. 3 type-test standards.
Our panel boards are tested for:
a) Strength of materials and parts
b) Degree of protection of enclosures (IP)
c) Clearances
d) Creepage distances
e) Protection against electric shock & integrity of protective circuits
f) No verification by testing required
- Incorporation of switching devices
- Internal electrical circuits and connection
- Terminals for external conductors
g) Dielectric properties
h) Temperature-rise limits
i) Short-circuit withstand strength (incl. PE)
j) Electromagnetic compatibility
Beyond compliance with standards, electrical panel boards are designed based on their level of protection and internal segregation, particularly Ingress Protection (IP rating) and Form of Separation.
The IP Rating Indicates how well the panel enclosure protects against dust, moisture, and environmental elements. The first digit of the IP rating represent the level of protection against solid objects and dust particles, where a higher number means greater resistance.
The second digit represents protection against liquids, ranging from dripping water to full immersion. For example, IP42 and below panels are common for clean indoor environments, while IP45 or IP55 panels offer stronger protection against water spray, dust, and harsh conditions.
Another important factor is the Form of Separation, which defines how internal components such as busbars, breakers, and wiring are partitioned for safety and ease of maintenance. Form 1 offers the most basic separation, while Form 4 offers the highest protection by reducing the risk of accidental contact and allow safer maintenance without shutting down the entire panel.
By considering both the IP rating and Form of Separation, consultant can select an electrical panel board design that best meets the installation environment, operational needs and safety requirements.
Some commonly heard panel boards includes Main Distribution Board, which serve as the core of electrical system, handling high incoming power and distribute downstream. Whilist Sub Distribution Board is used to step down electrical power and distribute power load across different zone in buildings. Last but not least, Distribution Board serve final circuit such as lighting and HVAC system.
Beyond standard indoor boards, electrical panel boards also come in specialised configurations designed for different installation needs. Weatherproof Panels feature enclosures with high IP ratings, making them suitable for both indoor and outdoor installations where they must withstand liquid, heat, dust, and other environmental factors. Overground Panel (or OG Box), on the other hand, are raised 1300mm–2000mm above ground to improve visibility and prevent water-related damage. Commonly used in outdoor infrastructure like airports or public utilities, and a high IP rating is equally essential to withstand environment elements.
For more complex or large scale setups, Skid Modular Panels integrate multiple systems such as switchgear, control panels, and distribution boards in one pre-tested enclosure. These modular units arrive ready to deploy, reducing onsite work and challenges during installation. Together, these panel variations allow engineers to identify solutions that fit specific environments and operational demands.
How to Choose the Right Electrical Panel Board
Design an electrical panel board for a project, consultant and architect need to carefully evaluate both current and future requirements for long term performance and system reliability. Start by assessing the facility’s electrical demand, including peak loads, critical equipment, overall consumption patterns, and environment factors. It’s also important to plan for future upgrades, ensuring the panel can accommodate additional circuits or increased capacity without major modifications. Consider the installation environment, such as whether the panel will be indoors or outdoors, and choose an appropriate IP rating to protect against dust, moisture, or harsh conditions.
Finally, ensure the panel meets relevant compliance standards, including the latest international regulations for IEC 61439 Ed. 3 and energy efficiency certifications like Singapore’s Green Mark, which promotes sustainable and energy saving designs. By taking these factors into account, contractors can select a panel board that is safe, reliable, and scalable for both current and long-term operational needs.
Frequently Asked Questions About Electrical Panel Boards
An electrical panel board is a general term for any enclosure that distributes or controls electricity, which can include switchboards and distribution boards. A distribution board is a specific type of electrical panel that divides power into smaller branch circuits, typically for lighting, appliances, or equipment.
With proper maintenance, electrical panels typically last minimum 20 years. A routine inspections by expert team help extend operational life and prevent unexpected failures.
It’s illegal to do electrical panel installation yourself in Singapore because it can be dangerous. Engage only qualified and trained electrician to carry out any electrical installation, maintenance and repair work that are compliant with regulatory standard.
Calculate your total electrical load and include a 20–30% buffer for future expansion. Always consult an experience and knowledgable electrician for the right solution based on application requirements, physical constraints, form of separation, IP protection and etc.
Annual professional inspections are recommended. Industrial or older panels may require more frequent checks, including thermal scan to detect hotspots, busbar testing, and other relevant check.