When a power cut hits, the focus is usually on whether the engine will roar to life. However, for many UK business owners, the real danger isn’t a mechanical failure. It is a compliance failure.
If you are seeking to buy generator switchgear in the UK, understanding the legal framework of G99 and G100 is more than just a technicality. It is a fundamental requirement for the insurance and grid safety of your building.
At Blades Power Generation, we often see installations where the generator is top-tier, but the switchgear connecting it to the building is a grey market import that lacks the necessary certification to satisfy a UK loss adjuster.
What are G99 and G100?
These are Engineering Recommendations set by the Energy Networks Association (ENA). They govern how any generation equipment, including your backup power system, interacts with the National Grid.
● G99: Focuses on the requirements for generating equipment to connect to the distribution networks. It ensures that if the grid goes down, your generator doesn’t back-feed electricity into the street, which could potentially be fatal for utility engineers working on the lines.
● G100: Concerns Export Limitation Schemes. If your switchgear isn’t designed to strictly manage how much power is flowing where, you are technically in breach of your connection agreement with the DNO (Distribution Network Operator).
The Insurance Implication
It should be noted that most commercial insurance policies in the UK incorporate compliance with law clauses. Thus, in case of a fire hazard or electrical fault, the switchgear that does not conform to the ENA requirements will make your insurance invalid. Just testing the ATS will not work because you need to make sure the hardware is able to cope with faults in the UK network environment.
Don't Forget the Hardware
Many clients looking to save on initial capital costs search for used generators for sale in the UK to anchor their backup plan. This is a brilliant way to secure a high-spec engine at a lower price point, but you must ensure the switchgear paired with that unit is up to modern code. An older switchgear panel salvaged from a 1990s installation likely won't meet the rigorous safety and decoupling standards required in 2026.
The Blades Standard
At Blades Power Generation, we don't just supply boxes; we provide engineered solutions. Every piece of switchgear we commission is built to handle the specific demands of the UK grid, ensuring your site remains safe, legal, and fully insurable.
Need to ensure your backup system is compliant? Browse our range of UK-engineered switchgear or contact a Blades Power Generation engineer today for a technical consultation.
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