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RCD units

RCD Units, otherwise known as Residual Current Devices are life saving devices which have been purposefully manufactured to keep people safe in potentially dangerous situations. RCD’s are designed in such a way to protect you from fatal electric shocks if you accidently touch something live, for example a bare wire. RCD’s offer a further level of protection that standard fuses and circuit breakers do not, and with that being said, can also provide a certain level of protection against potential fires.

What does and RCD do and how does it work?

RCD’s are smart devices that come to life when there is a fault. They work in a clever way, protecting people against the risk of electrocution and fatal accidents. Built to be extremely sensitive, Residual Current Devices detect any faults with electrical equipment and switch off the circulation altogether when they find one. An example of this would be if you had a faulty appliance in the home that was overheating, causing the electric current to flow through something it isn’t meant to. RCD’s work by detecting this. They constantly monitor the electric current flowing through one of more circuits, and if they detect electric flowing through a path they aren’t intended to, they will switch the circuit off almost instantly. If electricity is running through a person, RCD’s can prevent fatalities by minimising the amount of current that flows through them.

RCD Units

The main types of RCD

RCD’s are incredibly smart pieces of technology that are generally used in areas of increased risk from electric shocks, such as bathrooms, kitchens and gardens. There are two different types of RCD that we use to ensure you are kept as safe as possible at all times. These are:

  • Fixed RCDs - Found in your fuse box at home, Fixed RCDs can be used to provide protection from individual or grouped circuits. This type of RCD offers the highest level of protection, protecting all sockets and wiring on a circuit, as well as any appliances connected.
  • Portable RCDs - These simply plug into any standard socket-outlet where you want to be safe. After this you are able to plug appliances into the RCD. When you use an appliance that has been plugged into an RCD, you are protected whilst you are in contact with the lead and the appliance itself. Portable RCD’s are useful for when fixed and socket-outlet RCD’s aren’t available.

How well do RCD’s work?

Studies show that RCD’s are approximately 97% reliable, which improves when the devices are checked and tested on a regular basis. Protecting your home, your family and yourself is an important thing, and by using RCD’s, you can significantly reduce the risk of fires being caused by electrical goods, as well as reducing the chances you will be electrocuted.

Some things you need to know about RCD’s

  • You should always be careful, regardless of the fact that these devices are designed to protect you.
  • You should make a note to check your wiring at home every 10 years. This will ensure the safety of you, your family and your home.
  • When you find a fault you should contact us immediately. We are qualified electricians who can diagnose the problem and quickly repair it.
  • All fixed and socket RCD’s should be tested approximately every 3 months.
  • All portable RCD’s should be tested EVERY TIME you use them.
  • If when testing your RCD’s they do not work, you should contact us for advice.
  • Under the latest edition of BS 7671, virtually all circuits since July 2008 in new or rewired homes have had to include an RCD.

If you live in Stanmore, Middlesex or anywhere across North London, HS Electrical can help you in every aspect of RCD installation and RCD repairs. Contact us today for advice or to ask for a FREE quote over the phone.


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