Well, I'll kick off the debate on SPDs. Once again, the emphasis seems to be on domestic (we all, or virtually all of us live in a home of one sort or another) so are the proposals an improvement or not?
I think the "injury/death" is targeted more along the lines of "if a transient of any form takes out some electrics, does the failure of those electrics risk injury/death? E.g. medical locations.
Also my understanding was that type 1 SPDs do help to an extent in direct hits - in that rather than protecting downstream equipment, their job is is to temporarily equipotentially bond the live part of the electrical system to the LPS - so there is less chance of a flash-over between, e.g. cabling and structural metalwork, and thus less risk of a fire starting. You'll still expect physical damage.
Type 2 and 3 SPDs are more about protecting electrical /electronic equipment from relatively low energy transients, e.g. 4kV with a rise time of 8us. These are likely to cause brief arcing in electronic equipment. Repeated over time, this erodes insulation (think of carbon deposits building up between two adjacent PCB tracks) until eventually the normal 230V supply overwhelms the device.
I think the "injury/death" is targeted more along the lines of "if a transient of any form takes out some electrics, does the failure of those electrics risk injury/death? E.g. medical locations.
Also my understanding was that type 1 SPDs do help to an extent in direct hits - in that rather than protecting downstream equipment, their job is is to temporarily equipotentially bond the live part of the electrical system to the LPS - so there is less chance of a flash-over between, e.g. cabling and structural metalwork, and thus less risk of a fire starting. You'll still expect physical damage.
Type 2 and 3 SPDs are more about protecting electrical /electronic equipment from relatively low energy transients, e.g. 4kV with a rise time of 8us. These are likely to cause brief arcing in electronic equipment. Repeated over time, this erodes insulation (think of carbon deposits building up between two adjacent PCB tracks) until eventually the normal 230V supply overwhelms the device.
