I notice that a column for SPDs has been omitted on the schedule of tests, as this type of protection is generally for individual circuit protection (types 2 and 3) and more likely to be available at a reasonable price rather than AFDDs. It could be that SPDs have no obvious method of testing unless we stick a 5kV DC voltage from a Clare tester otherwise mentioned in the 'equipment vulnerable to damage when testing........

I notice that a column for SPDs has been omitted on the schedule of tests, as this type of protection is generally for individual circuit protection (types 2 and 3) and more likely to be available at a reasonable price rather than AFDDs. It could be that SPDs have no obvious method of testing unless we stick a 5kV DC voltage from a Clare tester otherwise mentioned in the 'equipment vulnerable to damage when testing........