I would like to clarify an earlier question. I do not often deal with NEC. I am in the automation business and use NFPA, IEC, NEMA, and OSHA guidelines. A customer has made a reference to NEC 70, I had hoped for advice on what publication would best outline these codes. I do not know how NEC 70 applies to my application, this is my reason for seeking help in purchasing the most useful source material. Is it covered in a specific publication or do I need a current NEC volume?