Describe the work
Share what you need, whether you have a detailed plan or are still exploring the options.
Protect the circuits that matter most
Industrial critical circuit backup is an essential safeguard for any facility that cannot afford unplanned downtime. When the grid fails, your most important circuits stay powered. Instead of trying to supply the entire site, which would be costly and inefficient, critical circuit backup focuses on the loads that matter most, such as refrigeration, IT servers, control systems, security and safety equipment. Keeping these live during an outage reduces risk to staff, protects valuable stock and equipment, and supports your health and safety arrangements.
Emergency lighting and fire alarm systems have their own standards (BS 5266-1 and BS 5839-1) and their own dedicated battery backup. A critical circuit system can support them but should not replace them.
How it works
The process begins with a detailed site assessment. An experienced installer works with your management team to identify which circuits are truly critical. Those loads are then grouped onto a dedicated distribution board connected to a backup source, such as an industrial battery system, a UPS, a generator or a hybrid. An automatic transfer switch (ATS) detects when grid power is lost and switches to the backup supply. Battery and UPS systems transfer almost instantly and silently, while generator systems give extended runtime after a short start-up delay.
Standards and safety
The design must make sure the backup supply can never feed back into the network, and that earthing and protection still work when the system runs independently. BS 7671:2018+A4:2026 covers generating sets and changeover to an alternative supply, and Amendment 4 added new requirements for stationary battery installations. If equipment is designed to run in parallel with the grid, the distribution network operator must be told or must approve it first under the Energy Networks Association's G98 or G99 rules. The Electricity at Work Regulations 1989 apply throughout, and the finished work should be certified on an Electrical Installation Certificate (EIC), with the backup system included in your periodic inspection and planned maintenance.
Integration and monitoring
Many facilities now combine backup with renewables. You could link your system with industrial solar panels or wind energy solutions to reduce reliance on the grid and running costs, with surplus energy stored and reserved for critical circuits. Modern control systems show load status, generator fuel levels and battery state of charge, and can send alerts if backup readiness drops or the system detects a failure. Regular load tests, especially for generators, confirm the system will work when it is needed.
A tailored approach
Choosing the right system needs a tailored approach. A warehouse may need to protect refrigeration, while a manufacturing plant might prioritise production line controls. The qualified industrial electricians you can compare through Kilowatts UK design solutions to match how your site operates. Request a no-obligation quote, or call free on 0800 009 6058.