While this may have been published in the early 70s I suspect that there is still a lot that is relevant now, with the exception of the regulations and checks required when undertaking electrical installation work. Having said that while I did manage to follow the theoretical aspects of this book, the practical applications escaped me slightly as once again my brain proves that it is not built for some things, this being one of them. I'm sure however that those who have an idea of what they are doing would find this interesting if not useful.
This is an older edition that the first that I attempted to read and is just as confusing for me as the other one. But as previously I'm sure that those that have an interest or understanding of the subject would find this of some use, even if its just to see how things used to be done.