Blog posts of '2026' 'July'

When it comes to safeguarding your business operations against an unpredictable grid, finding the best emergency power source in the UK is only half the battle. The real challenge begins when you look at the technical spec sheets of industrial plant machinery. Many property managers mistakenly assume that if their facility draws 80 kW of power during peak operations, they simply need to buy an 80 kW generator.

At Blades Power Generation, we see this exact sizing error all the time, and it frequently leads to overloaded systems, tripped switchgear, or damaged electronics. To keep your business running smoothly, you must understand the vital difference between Kilowatts (kW) and Kilovolt-Amperes (kVA).

Understanding the 0.8 Power Factor

The easiest way to understand the difference is that kVA represents total apparent power, while kW is the actual working power that performs physical tasks.

In standard UK commercial electrical engineering, three-phase generators are designed based on an assumed power factor of 0.8. This decimal represents the efficiency of your building's electrical system.

The mathematical relationship is straightforward:

kW=kVA×0.8

kVA=0.8kW​

Therefore, if your data logs show your facility requires a true working load of 80 kW, your backup plant actually needs to be rated for at least 100 kVA. If you buy a unit rated at 80 kVA, you will only have 64 kW of actual working power available, meaning your system will immediately overload when the mains power drops.

Account for Large Starting Inrush Loads

Another crucial factor we always remind our clients about is the inductive load spike. Equipment with heavy electric motors, such as commercial air conditioning, industrial water pumps, and large passenger lifts, requires up to three times more current to start up than they do to run continuously.

If your backup system isn’t sized in kVA to absorb these temporary startup spikes, your emergency supply will instantly stall out the moment it takes on the building’s load.

The Blades Rule of Thumb: Always calculate your peak concurrent kW demand, convert it to kVA, and add a 20% safety margin to handle future business expansion and motor starting currents.

Once you have sized your engine correctly, you need a smart way to bridge the gap during a blackout. An automatic changeover switch is the ideal solution here, monitoring the grid line-by-line and seamlessly transferring your critical kVA load to the generator within seconds of a failure.

Don't leave your site's operational resilience to guesswork or risky shortcuts. View our latest technical range at Blades Power Generation or contact our Gloucestershire engineering team today for an accurate, bespoke load evaluation.

 

When the lights go out, there is a distinct comfort in grabbing a heavy-duty physical lever and taking control of your own power. However, if you are looking to buy manual transfer switch in the UK, you need to ensure that your hands-on approach does not accidentally land you on the wrong side of the law.

At Blades Power Generation, we see many property owners buy standard electrical parts online, mistakenly believing that any basic isolation switch will keep them safe during a blackout. In reality, the UK grid has strict engineering regulations. If your hardware fails to meet current British Standards, you risk heavy fines, electrical fires, and entirely invalidating your commercial or buildings insurance.

Before you hook up your emergency power, check these three critical UK regulations.

1. Does It Have a Mechanical Interlock? (BS EN 60947-6-1)

This is the most critical safety rule. Your switch must feature a physical, mechanical interlock. This means it is physically impossible for the mains grid supply and your generator supply to be connected at the exact same time. Without this, turning on your generator could feed electricity backward into the street mains, potentially electrocuting an unsuspecting utility engineer working to restore the lines.

2. Is the Neutral Line Switched? (BS 7671 Wiring Regs)

In the UK, almost all configurations will not be able to make use of a standard 3-pole changeover switch where the neutral line remains hard-wired throughout the process. In accordance with BS 7671, if you have to change from one earthing system to another (from grid earth and an independent earthing rod of the generator), then you need to change the neutral line. For this, you will require an actual 4-pole manual changeover switch for 3-phase systems, and a 2-pole changeover switch for single-phase.

3. Is the Enclosure Up to Code?

The days of mounting bare switchgear to a piece of plywood are long gone. UK regulations demand that changeover equipment must be installed inside a proper, robust, non-combustible enclosure, especially in residential or commercial pathways.

The Blades Standard: Every manual switch we supply is built into a minimum IP55-rated sheet steel enclosure with a padlockable door interlock to guarantee safety and compliance.

Don’t leave your facility's legal compliance or physical safety to guesswork. Explore our fully compliant range at Blades Power Generation or speak directly with one of our engineering experts today to ensure your backup power is completely bulletproof.