On Saturday, 20 July 2019 10:49:21 UTC+1, Tricky Dicky wrote:

but you also have to factor in the risk of a power surge causing harm.
I've only lost 2 bits of kit in 30-odd years: a PVR and an ATX power supply.

The risks of power surges seems quite low, to my knowledge I have never experienced one certainly not one that has resulted in damage or injury. It seems that the IET is getting to the point of trying to eliminate any risk no matter how small.

They're creating a risk many times the size of any risk that might be reduced.

To be honest it seems more faff to do the CRL calculation and the risk assessment than to stomp up the money and the few minutes to fit the device.

Richard

Even less faff to not waste the time.