Choosing RCD: How to Approach the Selection Correctly
The choice of Residual Current Device (RCD) is an important and responsible step. An RCD is a device that protects against current leakage from a wire to the ground, significantly reducing the risk of electric shock in your home. Current leaks usually occur due to old or unreliable wires.
Main Aspects of RCD Selection
When selecting an RCD, it is important to pay attention to the circuit breaker. The rated current of the breaker should be significantly higher than the power of the end consumer. For example, if your breaker is rated at 16A, choose an RCD with a capacity of at least 25A.
Selection Rules Based on Operating Conditions
To choose an RCD correctly, remember a few rules:
- For rooms with high humidity, the leakage current should be 10 mA.
- Make sure all wires are in order to avoid malfunctions of the RCD.
- For ordinary rooms, choose a device with a leakage current of at least 30 mA.
It is also generally recommended to install "main" devices rated at 300 mA, after which similar devices should be used on the outgoing lines.
Types of RCDs
There are several types of RCDs. Type AC devices protect against alternating current but are banned in European countries. Meanwhile, type A devices protect against alternating current with pulsations created by household appliances such as microwave ovens and washing machines. For rooms with such appliances, it is better to choose type A RCDs.
RCD Construction
Pay attention to the construction of the device. Electromechanical RCDs based on relays and transformers trigger at any voltage but may be more expensive. Electronic devices consist of electronic components and have their own advantages and disadvantages.
Safety in Your Home
Every apartment must have at least one RCD to ensure your safety. It is even better to install an additional device in the bathroom, where the risk of electric shock is high.