Designing safe electrical systems is about more than meeting technical specifications; it’s about protecting people, equipment, and operations. Every electrical design decision has an impact on safety, performance, and compliance.
At Covol Engineering, our goal is to design high and low voltage systems that perform efficiently and meet all UK safety standards. Whether you’re managing a large industrial network or a small commercial installation, following best practices is essential for both compliance and long-term reliability.
Understanding High and Low Voltage Systems
Before designing an electrical system, it’s important to understand the difference between high voltage (HV) and low voltage (LV).
High voltage systems typically operate above 1,000 volts AC or 1,500 volts DC (BS7671), while low voltage systems operate below those voltages. In some environments, Safety Extra Low Voltage (SELV) systems, operating at voltages low enough to prevent dangerous electric shocks, are used for control circuits, or environments where contact risk is high.
Following Low and High Voltage Safety Rules UK
Designing and maintaining high voltage installations in the UK means adhering to strict high voltage safety rules. These include but are not limited to:
- Ensuring all HV work is carried out by competent and authorised personnel.
- Isolating and proving dead before access to any part of the system.
- Maintaining clear documentation of switching procedures and permits to work.
- Using approved arc-rated PPE and insulating tools during maintenance and testing.
At Covol, our engineers design systems that comply fully with UK regulations and standards , including health and safety at work act 1974, the Electricity at Work Regulations 1989, BS EN 61936 for high voltage installations and many more. These regulations and standards form the backbone of high-voltage electrical safety and ensure that workers and assets remain protected at all times.
Design for Fault Protection and Arc Flash Safety
Electrical faults can cause severe injury or equipment damage if not properly managed. Every system must be designed to control fault energy and isolate it safely.
At Covol, we integrate Protection Coordination Studies and Arc Flash and Fault Level Assessments into the design process. These help to identify high-risk locations, determine safe clearing times, and reduce potential arc flash incident energy.
By ensuring protection devices operate in the correct sequence, we minimise both risk and downtime. This process aligns with the high voltage electrical safety principles and ensures compliance with both UK and international standards.
Grounding and Earthing: The Foundation of Electrical Safety
A well-designed earthing system provides a safe path for fault currents to be safely dispersed into the ground, preventing electric shock and damage to equipment.
Covol designs earthing and bonding systems that comply with BS EN 50522 and BS 7671, ensuring both touch and step potential limits remain within safe boundaries. For both high voltage systems and low voltage systems, correct earthing arrangements are essential to meetUK standards and regulations, by maintaining compliance, Covol helps protect personnel from electric shock and prevents equipment from damage.
Apply Low Voltage Electrical Equipment Safety Regulations
All low voltage equipment installed in the UK must meet the Low Voltage Electrical Equipment Safety Regulations 2016 and BS7671. These regulations apply to equipment operating between 50 and 1,000 volts AC (or 75 and 1,500 volts DC).
When designing low voltage systems, Covol ensures:
- All components are CE marked or UKCA certified.
- Protective devices meet BS EN 61439 standards.
- Installation practices comply with BS 7671 Wiring Regulations.
- Residual Current Devices (RCDs) and other safety mechanisms are correctly rated for the intended application.
By following these regulations and many more, we ensure that every installation is safe to operate, efficient, and compliant with UK legislation.
Ensure Correct Insulation and Cable Selection
Cables and insulation materials must be chosen based on the voltage rating, load current, environmental conditions, and calculated fault currents. In accordance with BS 7671, the design must satisfy the relationship:
Ib ≤ In ≤ Iz,
Where Ib is the design current, In is the protective device rating, and Iz is the cable current-carrying capacity. Adhering to this principle ensures the safe operation of the power system and prevents the cables from becoming the weak point in the installation.
- High Voltage Systems: Require cables with enhanced insulation, mechanical protection, and stress control layers to handle potential short circuit currents.
- Low Voltage Systems: Focus on flexibility, heat resistance, and accessibility, particularly in commercial and industrial environments.
Every design should account for the operating temperature, installation method, and expected service life of each cable system.
Consider Safety Extra Low Voltage (SELV) in Design
In specific environments, Safety Extra Low Voltage (SELV) systems are an effective way to reduce electrical risk. These systems operate at a voltage low enough that, under normal or single-fault conditions, a person cannot receive a dangerous shock.
SELV is particularly useful for:
- Wet or confined environments.
- Control circuits and emergency lighting.
- Locations with direct public access.
Covol includes SELV design principles where necessary to improve overall system safety and comply with UK low voltage safety standards.
Verify and Revalidate the System
Even the most carefully designed system requires verification and revalidation to ensure ongoing safety. Before energisation, every electrical design must be reviewed for compliance with the latest standards.
Covol carries out Electrical Design Verification to confirm that designs meet UK regulations, including BS 7671, IEC 60364, and the Electricity at Work Regulations. We also provide periodic reviews to ensure systems remain compliant as they evolve.
Partner with Covol Engineering for Safe Electrical Design
Electrical safety begins with good design. Whether you need high voltage systems for industrial power or low voltage systems for commercial facilities, Covol Engineering provides the expertise and compliance assurance you need.
Our engineers combine decades of experience with advanced software tools and in-depth knowledge of UK legislation to deliver designs that are safe, efficient, and fully compliant.
Contact Covol Engineering today to discuss your next electrical project and ensure it meets the highest standards of safety and reliability.
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