We are presently installing additional electrical circuits via an additional consumer unit in a location remote from the CU and at the same time will have inspection and test as necessary for the original set up, with Hager main CU installed in late 2015 not long after we moved in, and various alterations and additions in late 2018.
The system is TN-C-S. No isolator switch on the main board (outside) but quite obviously someone has pulled the main fuse (100Amp) as it has no seals. The installation was upgraded by the supply company back in 2015 mainly to provide beefed up 25mm tails and 16mm earth, from whatever was there before. This was at the request of my then electrician. It is therefore all quite new.
I have three spare slots in the main CU and a genuine Hager type 2 surge protection unit would take 2 of those. We have been experiencing failures in good quality LEDs (Phillips) and being a) out in the sticks and b) fed by overhead powerline afflicted by tree encroachment, I am wondering if overvoltage surge is a factor.
Does anyone have any experience of CU surge protectors (as opposed to the extension lead type which are no use on things like ceiling lights)? Any pros and cons? I know that SPs wear out over time as they absorb the surges, but I can always replace the cartridges after a few years.
The extra work is Part P notifiable and I have not engaged an electrician yet though I have one on standby for mid Feb. I am just doing my research on the overall spec. The surge protector is just an add on that I could do as well as the main work.