Try this http://www.downloadpdffree.com/iee-wiring-regulations-16th-edition.pdf I have not checked it just found it
http://www.ebook3000.com/16th-Edition-IEE-Wiring-Regulations--Design_7659.html I haven't downloaded it to see if it works.
this should work, fingers crossed. https://www.dropbox.com/s/zh3dzvhs7...ations [3 books] - B. Scaddan (2001) WW-1.pdf