I have a 17th ed, AMD 3/3rd ed copy, but was thinking about getting the 18th ed vs. So I'm wondering, if anyone has both copies, other than regulation numbers, is there a significant change in the 18th ed, to warrant getting a copy?
I agree nothing significant has changed. As the OP says, the laws of maths and physics don't change and the book is focussed on calculations rather than regulations.
It might have been nice to have a bit of background to the calculations behind the SPD risk assessment - i.e. the physics behind why an screened underground cable is as much as half the risk of the same length open wire overhead (previously we were given the impression that underground cables were far less vulnerable) and why we only consider 1km of cable and so on. Not new physics for sure, but an area we didn't previously have to consider...
I agree nothing significant has changed. As the OP says, the laws of maths and physics don't change and the book is focussed on calculations rather than regulations.
It might have been nice to have a bit of background to the calculations behind the SPD risk assessment - i.e. the physics behind why an screened underground cable is as much as half the risk of the same length open wire overhead (previously we were given the impression that underground cables were far less vulnerable) and why we only consider 1km of cable and so on. Not new physics for sure, but an area we didn't previously have to consider...
