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It would have depended where you fitted these SPD. They will come in 3 classes Type I II and III the type I will normally be fitted at the origin of the supply mainly for transient voltages due to lightening strikes and are not that common in the UK.
Type II would be at local distribution boards if they are 3 phase then the SPDs would not have been much use for you as the 400volt would not be deemed a surge, if they were single phase boards then yes they would have protected the system. These type are quite common in installations that have high switching due to inductive loads such as motors, elevators or HF lighting.
The Class III are very local and are often incorporated into a BS 1363 Socket outlet to protect appliances or equipment as a singular option.
These items are not cheap and it really would be a costing exercise. Personally I would be advising a good PPM schedule with the infra red technology, and perhaps even if the insurance don't insist on it having a contracting in once a year to do thermal imaging
Type II would be at local distribution boards if they are 3 phase then the SPDs would not have been much use for you as the 400volt would not be deemed a surge, if they were single phase boards then yes they would have protected the system. These type are quite common in installations that have high switching due to inductive loads such as motors, elevators or HF lighting.
The Class III are very local and are often incorporated into a BS 1363 Socket outlet to protect appliances or equipment as a singular option.
These items are not cheap and it really would be a costing exercise. Personally I would be advising a good PPM schedule with the infra red technology, and perhaps even if the insurance don't insist on it having a contracting in once a year to do thermal imaging
