Blog posts tagged with 'manual transfer switch generator uk'

Are we going to get through the winter in the UK without having power cuts?  What are the odds?

Well, if you listen to the government, everything is going to be hunky-dory. No power cuts. No worries.

But would you like to put your money on it? Say, £100?

Quite!

This is just one reason why so many people are considering investing in a standby generator to cover them if the worst really does happen. But there could be another one as well. It may well be cheaper to use a generator to produce your electricity than to use the mains.

You Are By No Means Alone

So, if you are considering investing in a generator for your home, you are by no means alone. The size of generator that you will need depends upon how much electricity you need to produce which, in turn, will depend upon the number, type, and size of the electrical products you use. The bigger the generator – not just in terms of sheer size but in the amount of electricity it can generate – the more it will cost.

However, you don’t necessarily have to buy a new generator, as at Blades Power Generation we have used generators for sale in the UK. And before you say: “uh oh, I don’t want a second-hand generator”, why ever not? If you are like most people, you will have bought a second-hand car in the past. You may even have one now. Buying a second-hand generator is just the same.

In fact, we always have a selection of used generators for sale in the UK. Many businesses use generators, and what happens is that they expand and take on extra work and produce more products. So, they need a bigger generator to produce more electricity, so they trade in the old one with us.

You will also need a transfer switch to transfer from mains to generator when the power goes down, and you can use a manual transfer switch or an automatic one. If you use a manual transfer switch you have to start the generator and then switch over to it when it is up and running. An automatic transfer switch – as the name implies – does it all for you. It is more expensive than a manual one, but the choice is yours.

What Would We Do Without Electricity?

The short answer is that we would be living like that ancient fellow in the Amazon jungle who was found dead a couple of weeks ago, and who had no contact with humans in the outside world. All he knew was hunting and fishing and being able to build himself a home by digging holes in the ground.

He didn’t have light, except for daylight. He didn’t have a laptop. He didn’t have a fridge or freezer. He didn’t have a TV. He didn’t have a shaver. He didn’t have hot water. The list of things that he didn’t have goes on. We have all of these things, (with the possible exception of the shaver if you are of a female persuasion!). What would we do without them all?

The answer is that we would be in the dark, both figuratively and literally. Yet, the way that climate change is going, and the race to get to green power without producing a carbon footprint means that in the not-too-distant future, power blackouts could become a regular feature of our lives.

That is no fun at all and is the reason why a lot of smart people are investing in a home generator which can produce power when the mains power goes down. Anyone who has the space for a generator can do this.

However, there are certain things to take into consideration, the size of the generator being one of them. It needs to produce enough power to run everything that you want to run.

A Transfer Switch

You also need a manual transfer switch or an automatic one. A manual transfer switch is much cheaper than automatic. What happens is that when the power goes down, you have to go and start your generator and then switch from mains power to generator using the manual changeover switch.

Why do you need a changeover switch? Because if you start the generator and the mains comes back on and the two are connected, you will burn out the generator. It can also work the other way. The generator can produce power which would go into the mains and very easily cause injuries to workers trying to restore the power.

So, the system is set up so that you cannot have mains and generator power at the same time. The way that works is that you use the manual changeover switch to switch from one to the other, either when the power goes down or when it is restored.

If you are considering buying a standby generator for your home, which in the light of recent events in the north many homeowners are looking at, there are a number of things to consider.

The first thing is to buy a generator which does what you want, because generators come in different sizes. One answer is to buy the largest size available in order to power the entire home, and if money is no object that could be one solution. However, if you want to buy a generator which only covers the essentials in order to keep costs down, then you will need to make an assessment of your home to purchase a generator which will cover only the essential electrical circuits.

However, sizing generators is not just a question of saying that your home is “x” square feet, so you need an “x” size generator. The complexity of your home’s electrical system also needs to be taken into account, especially if it has air conditioning. You will need an experienced electrician to calculate the electrical loads of your home and recommend he right size of generator.

Once you know this, you can then buy the generator and install it. However, there is also another issue, and that is how the generator starts when the power goes down. When this happens, it is necessary to switch from mains power to generator and it can be done using a manual changeover switch or an automatic one.

With a manual changeover switch you have to physically start the generator, and then when it is up and running one needs to switch from the mains to the generator. This means that there will be a delay while you do this. It also means that if the power goes down when you are not at home there will still be no power until you get back again. This may, or may not matter, depending upon what systems and equipment you use.

However, you can also get an automatic transfer switch. This is more expensive, but the way that it works is that when the power goes down the switch will send a signal to the generator telling it to start up. When the generator is running it will send a signal to the ATS telling it to switch over. When the mains power is restored, the ATS will switch off the generator and transfer back to the mains.  

If you have a standby generator at your home so that you can still generate electricity when the power fails, then the law requires you to have a transfer switch. This is the case in every country when installing a generator at a property with a mains supply. It can either be a manual transfer switch in the UK or an automatic transfer switch. It doesn’t matter which, but you must have one or the other.

The reason is actually quite simple. When you have a transfer switch it will prevent the generator from back feeding the mains when it has gone down which would put the lives of electricity workers in danger while they are attempting to restore power. It is also good for your generator because it stops mains power from coming into contact with it, which would almost certainly burn out your generator.

One advantage of a manual transfer switch in the UK is that it is cheaper to buy and install than an automatic transfer switch. However, it means that you have to switch it over manually, obviously, which means that there will be a delay in the power supply to your home or business premises.

Somebody Needs To Be On The Premises

Not only that, but it also means that somebody needs to be on the premises at the time the mains goes down. In some instances, this may not be much of a problem, but could cause issues if you need a constant supply of power. With an automatic transfer panel, the generator will start up automatically whether you are there or not.

Automatic transfer switches come in a variety of designs, but typically a mains failure relay is fitted in an electrical enclosure, with two contactors. These are electrically and mechanically interlocked so that they cannot both be closed at the same time. The contactors need electric power in order to close.

The mechanical interlock should stop both contactors closing at the same time, but the electrical interlock provides extra protection. A normally closed contact is fitted to each contactor and when the contactor is energised, they open. If you have two contactors, A and B, the circuit to close contactor A is wired through the auxiliary of B. Therefore, when B is closed, it is not possible to energize A. The same is true for B, which is wired through the auxiliary of A. This provides the electrical interlock.

What happens is that when the mains fails, the ATS will send a signal to the generator and when it is up to full power the ATS will open the mains contactor and close the generator contactor. When the mains returns, the generator contactor is opened and the mains contactor is closed. This means that there will always be a short break in the power supply when changing over.