The three stages of protection
- Type 1 (Class I / B) – at the service entrance; handles direct lightning currents; mandatory where an external LPS is installed
- Type 2 (Class II / C) – in the main and distribution boards; the basic protection for every building
- Type 3 (Class III / D) – at socket outlets and close to sensitive equipment; fine protection for electronics
What the service includes
- Inspection of the electrical installation and earthing (without good earthing an SPD cannot do its job)
- Selection of devices according to the earthing system (TN, TT), the rated current and whether an LPS is present
- Installation in the board with the correct conductor cross-sections and the shortest possible connection leads
- Protection of telephone, internet and antenna lines where needed
- Checking and replacing worn-out SPD modules at periodic inspections
Frequently asked questions
I have circuit breakers and an RCD – don't they protect me?
No. Circuit breakers respond to overloads and short circuits, and the RCD to earth leakage. A lightning impulse lasts microseconds and passes straight through them. Only an SPD diverts it to earth before it reaches the equipment.
How much does surge protection for a house cost?
A Type 2 set for a detached house, installed in the main board, is a relatively small investment compared with the cost of a single inverter or air conditioner. We give an exact price after inspecting the board.
